Could you confidently identify the deadly water hemlock dropwort ?
Key features to know when identifying water hemlock dropwort.
Water hemlock dropwort is one of the most important plants for foragers to know well, and I mean really well! Your foraging safety may depend on you knowing this and the other relatively few deadly poisonous plants that you are likely to come across when foraging.
Read on for botanical descriptions, photographs and videos to help you identify water hemlock dropwort. It’s a really common plant, and if you are anywhere near water, it’s one that will be found throughout the year, unless covered in snow.
If you are interested in foraging from the carrot family, and to be fair, it’s almost inevitable that you will be if you have fallen in love with wild foods, then it will become absolutely necessary to know this plant, alongside it’s look-a-like relatives. This will probably require careful and repeated study, at all stages of its growth, and often with the passing of a couple of years.
Umbellifers are extremely common – an absolute staple of the countryside, and have therefore found homes all over our towns and cities as soon as we moved in.
Aside from the half dozen or so close relatives in the genus Oenanthe (some also reportedly poisonous but not deadly), water hemlock dropwort has a couple of edible plants that it superficially resembles, and one plant that it’s almost a dead ringer for at first glance!
The look-a-likes often happen to live side-by-side in favourite habitats, so all the more reason for proceeding with caution.
Key features to look out for when identifying water hemlock dropwort.
Luckily for the budding forager, Water hemlock dropwort is easy to find! Pop down to almost any watercourse in Britain and you should come across it’s lime-green foliage. During the winter months it can be found growing happily away with basal rosettes of leaves. With so many other plants dormant, you should find it easier to spot during the darkest days of mid-winter.
As long as you are remembering to re-visit patches and plants through the seasons then you will get to know the plant. Understanding a plant’s refinement in form as it develops to produce a flowering stem, will mean you are ready for the changes in appearance that this plant produces.
Botanical an Photographic guide to water hemlock dropwort (Oenenathe crocata).
Water-loving herbaceous perennial
Shiny, triangular, pinnate leaves, 3-4 times divided with oval – lanceolate leaflets
Water hemlock dropwort can grow in excess of 1 m 50 cm across and 1 m 5o cm high
The plant ‘over-winters’ by watercourses, so can easily be spotted
Leaflets with deeply cut toothed margins
Celery / Parsley scented herb
Petiole solid, with spongy pith, occasionally with white latex
Petiole sheath at the base
Petiole a flattened cylindrical-shape, with fine ridges
Hollow, cylindrical flowering stems, with fine grooves
White compound umbels, individual umbels displayed like pom-poms
Umbels 10-20 cm with many rays
Bracts and bracteoles are small linear, and will wither
Tiny (2 mm) pom pom white flowers with unequal petals and tiny red anthers in the flower
Fruits 4-6 mm, cylindrical, ridged
Fat, oval-spindle shaped tuberous roots.
Favourite habitats of water hemlock dropwort
marshes and moist ground
wet woodlands and woodland clearances
brooks, streams, riverbanks and canalsides
None of course! – All parts of this plant are deadly poisonous – One bite of the root is apparently sufficient.
Lookalikes – Other water-dropwort Oenanthe species, wild celery (Apium graveolens), alexanders (Smyrnium olusatrum), and wild angelica (Angelica sylvestris).
This summer-flowering medicinal plant grows wild and free throughout many areas of Britain. With a liking of numerous settings it will be easy for foragers to find St John’s wort, and with unique observable characteristics, it is simple to identify. You can find out more about plant identification on my foraging walks and courses.
The scientific name for the genus, Hypericum, is thought to originate from the two Greek words – hyper, meaning above, and eikon, meaning ‘picture’.
The bright yellow flowers, which many centuries ago were felt to be symbolic of the sun, or spirit, were placed above religious pictures, specifically St John, to help ward off evil spirits during the celebrations of the midsummer Christian festival. Church leaders placed their festival onto the ancient summer solstice festivities (since the introduction of the Gregorian calendar, this has traditionally been celebrated on 24th June, previously falling on or around the 5th July).
The extractable red flower oil was previously meant to symbolize the blood of St. John. The species name perforatum is derived from the Latin word meaning perforated. Visible translucent perforations on both the leaves and the petals are visible with the naked eye.
Botanical description of St John’s wort
St Johns wort is a native British perennial, from a genus containing over 400 species of annuals, herbaceous perennials; deciduous, semi-evergreen and evergreen shrubs and trees. This plant grows throughout Europe.
St Johns wort is a clump-forming perennial which can grow to a height of up to 90 cm in flower. Re-appearing each year from its crown, it produces numerous red stems that eventually branch towards their upper parts. The stems bear small and hairless leaves, which are opposite and mostly oblong, but always sessile. The leaves typically grow to 3-4 cm long.
If you hold the stems up to the light, close inspection will reveal the leaves have numerous translucent glands, as well as a few dark ones at the edges on the undersides. The lanceolate petals and shorter sepals in the flower are also marked with dark dots.
The presence of the dark oil bearing glands, as well as the slight, opposite ridges on its round stem are crucial identification factors between this and one of more than half a dozen other Hypericum species that populate Britain.
The bright, glossy yellow flowers are similar in size to a buttercup. They have five petals and are borne on a corymb inflorescence. These types of flowering displays are often referred to as umbel-like.
When in full display, the shiny, showy blooms are noticeable for having more than fifty stamens spraying out from the centre of the flower. These are fused in the lower part into three bundles.
The flowering period for this plant is usually lengthy, and occurs between June and September, with the seeds ripening from late July to October. The self-fertile flowers are pollinated by bees and flies.
Soils and Habitats
St Johns wort absolutely delights on calcareous (alkaline) soils, as will be seen by the propensity of it when visiting chalk grasslands such as around Winchester and in West Sussex on the South Downs. It’s not a completely fussy plant, so will also be found on mildly acidic ground.
It can do well on waste-ground and some woodland edges, and is often seen happily populating pastures, as well as roadsides and occasional hedges. This is a lowland plant, so will be found at maximum altitudes up to around 480 metres.
St Johns wort can grow in the semi-shade of light woodland, or will be even more happy in full sun. The large tap-root helps it to flower right through the summer, even during periods of drought.
Although the plant can set viable seed, regeneration also occurs through its creeping lateral runners, arising at various points on the rootstock.
Parts used Leaves, flowers.
Harvest In summer (Flowers only for an infused oil).
Pharmacology and usesThe chemical composition of St. John’s wort has been well studied, especially in the last thirty years. Documented pharmacological activities include anti-depressant, anti-viral, and anti-bacterial effects. These provide supporting evidence for several of the traditional uses stated for St John’s wort.
In terms of the recent history of British herbal healthcare, St Johns wort has had a somewhat meteoric rise to prominence. Many of its pharmacological activities remain unclear, although a number of actions have reportedly been attributable to hypericin and the flavonoid constituents.
Evidence from a number of randomised controlled trials during the 1990s, highlighted and confirmed the efficacy of St John’s wort extracts over placebo’s, in the treatment of mild-to-moderately severe depression.
St. Johns wort and extracts of it have been shown to be effective against short-to-medium term mild depression, but not long-term or severe depression. As with a lot of plant medicines, there is a need to further assess the efficacy of St. Johns wort, compared with that of standard anti-depressants.
Although the anti-depressant actions of this plant were only elucidated during the last 40 years or so, this plant had an acknowledged ability throughout history to relieve melancholy, as was noted by Gerard in his Herbal (published 1597). Folk medicine records also show many lay-people knew of its power to cure nervousness and low spirits, so it was also used it as a general tonic.
St John’s wort and mono amine oxidase inhibitors
St Johns wort contains molecules known as MAOI (mono-amine oxidase inhibitors). As their name suggests, the MAOI action is an inhibiting one. These molecules are known to increase the availability of mono-amine neuro-transmitters such as serotonin in the brain (thereby helping to combat feelings of depression). This plant is known to increase deep sleep and can be useful in cases of insomnia.
Interestingly though, the MAOI in this plant are weak and have been shown not to be responsible for the anti-depressant effect of St. Johns wort! However, what scientists do know about hypericin and the flavonoids are that they exert a number of effects on both the GABA (Gamma Amino Butyric Acid) and Glutamate receptor sites in the brain. These neurotransmitters are directly involved are in feelings of well being and in helping our central nervous system relax.
A number of concerns have been raised by allopathic practitioners over possible dangerous interactions between St John’s wort and certain prescribed medicines (including warfarin, ciclosporin, theophylline, digoxin, HIV protease inhibitors, anti-convulsants, selective serotonin re-uptake inhibitors (SSRI’s), ‘triptans’ and oral contraceptives).
Medical advice in Britain and America usually states that patients taking the aforementioned medicines should not take, or stop taking St John’s wort! Before embarking on a course of St Johns wort, and especially when on other medication, you need to seek advice from a pharmacist or another healthcare professional with detailed knowledge about these potentially dangerous adverse interactions!
Concentrating on the anti-depressant substances in St Johns wort could detract somewhat from the many other traditional applications for which this plant has been used.
Interestingly, a book by Gabrielle Hatfield and David E Allen, titled ‘Medicinal Plants in Folk Tradition – An Ethnobotany of Britain and Ireland’, which was published almost 10 years ago, suggests that the reputation St. Johns wort has for healing cuts, grazes, and more serious wounds and burns, is likely to be more attributable to all of the Hypericum species found in Britain, rather than the one species under discussion in this monograph.
Moreover, St John’s wort is a name given to more than one Hypericum species, and judging by maps of the British flora, H.perforatum won’t be found in all the areas that records of ‘St Johns wort’ use has been documented.
In their fascinating book, pieced together using information from before mass public travel and transportation, and sourced notably from unconnected areas of the UK and the Isle of Man, the authors report that various Hypericum species have been used, and seemingly with much effect.
St Johns wort oil has long been known of, for its topical pain relieving and soothing action on burns and scalds, ulcers, inflammations, and various forms of muscular pain.
The red-coloured infused oil, extractable from the petals, has been used for these and other related complaints. St Johns wort can be usefully employed to treat conditions such as neuralgia, fibrositis, sciatica, excitability, anxiety, and as a general nerve tonic.
St Johns wort also aids the regeneration of granular tissue during healing of wounds. Indeed, Nicolas Culpeper, described in the 1640’s that it was “a singular wound herb” and that “it closes up the lips of wounds”.
Today, St Johns wort is a well known species and one of our most widely used herbal remedies. Contemporary uses have built on the fragments of traditional folklore collated from these islands. It is one of the staples of any Materia Medica here in Britain, and due to it being so common, one you can easily harvest, process and store each summer.
Using plant pattern to make identification easier in the field.
Ever since Carl Linnaeus devised his binomial classification system in the 18th Century, we have been actively using plant patterns to attain correct identification. Although DNA technology has come to supercede this somewhat, plants people throughout the world still use the floral patterns as a basis for deciding upon the plant family to which a plant belongs.
In this article I will be introducing some essential tips to help you confidently and safely forage for more plants than you thought possible. Some of the terminology may seem strange when setting out on your foraging adventures, so a quick brush up on the basic leaf shapes that you are likely to encounter will help you.
A knowledge of habitats and where to go foraging, either in the countryside or in towns and cities will be invaluable. to this end I compiled a guide to urban foraging that will prove helpful for beginners and the more experienced foragers alike. As well as showing you the best of our edible plants here in the UK, it is more important that I guide you through the common poisonous plants that are found here.
This may well lead you to ask the question “what is edible anyway?” The answer to that question is not as simple as knowing that a plant can be eaten. It is as important to know what time of year to harvest, and what stage in its growth development is it at its best for picking. A discussion on this can be found here.
Plant patterns aren’t just what we can see though. One of the most important plant patterns is often unknowable until we engage our sense of smell. Plant chemistry and plant constituents are vital in helping us understand and know plants, It is often the smell of a plant that can be a clinching factor in positively identifying
The following common plant families are some of what I consider to be the most important for foragers to learn when out and about in the British Isles.
The mint family plant patterns
Annuals; biennials; herbaceous perennials; shrubs
One of the most well recognised and commonly used plant families in the world. Just about everyone knows some of these plants, and use them almost everyday in the kitchen or bathroom. So it makes sense to start our discovery about using plant patterns with the one of the best known patterns.
The mint family contains around 3,300 species in approximately 230 genera.
All plants in this family will be seen to have square stems. They have simple leaves, always opposite on the stems. The leaves appear at right angles to the previous pair.
Many members of this family are aromatic. The flowers consist of5 united sepals(the calyx) subtending 5 united petal lobes. These flowers are two-lipped. Many species will be very aromatic and produce flower buds covered in essential oil glands.
Both lips of the flower are lobed; with 2 upper lobes and 3 lower lobes.They can be pronounced and wholly irregular lobes, as found on rosemary, or smaller more regularly lobed as will be found on marjoram.
The Flowers have between 2-4 stamens. This family all have a superior ovary. The fruits are small, and often referred to as nutlets.
Many of these plants have creeping underground stems (stolons), or creeping overground stems (runners). These adaptations help the plants quickly establish, colonise, and reproduce after injury, disturbance or grazing, because these stems are adapted to produce shoots and roots from every node.
The carrot family plant patterns
Annuals, biennials, herbaceous perennials
Possibly the most important plant family for a forager to know! This family contains some wonderful foods, powerful medicines, and deadly poisonous plants! There are approximately 3,600 species in 430 genera
The major pattern you will notice are the characteristic compound umbel flowers. Have a close look at any carrot family plant next time you see one in flower. You will notice the set of flower stalks emanating from a central point, very much like an umbrella.
This inflorescence is called an umbel, hencethe former family sobriquet of umbelliferae. At the end of each of these stalks is a second umbel arrangement. Unlike a true umbel therefore, each compound umbel is always made up of smaller individual umbels.
Each of the small individual flowers boasts 5 petals, 5 stamens, 2 stigmas and an inferior ovary. The plants found in this country give us flowers that are generally white, with a few yellow, species. Occasionally the white flowers emerge with a pinkish tinge, and very occasionally the flowers are blue (Eringyium maritimum – sea holly).
Carrot family plants produce their foliage alternately spaced on the flower stems. The leaves are usually repeatedly pinnate, and typically in an overall triangular shape.
Some of the plants have very fern-like leaves, as can be found on sweet cicely (Myrrhis odorata), hemlock (Conium maculatum) and caraway (Carum carvi). Most have leaflets that are lobed, often deeply lobed.
Most of the plants have hollow stems, although the wild carrot (Daucus carota), and a other few plants, will have solid, pith filled stems. When it comes to identifying individual species, the shape of the petioles, together with arrangement and number of vascular bundles will assist tremendously in determining who’s who!
The corolla of certain species can contain larger outer petals, yet many species will produce five equal sized petals. The density and diversity of the shapes of the umbels become apparent with any amount of time spent studying them. The fruits of the carrot family are technically schizocarps – dry fruits that split on maturity, into two separate parts. We colloquially call them seeds. A number of the family are strongly aromatic and have found use in the kitchen for millennia. Enjoy getting to know them more in my article ‘Know your carrots’ !
The pea family plant patterns
Biennials; herbaceous perennials.
This is another large and well-known family of plants.A number of species are economically valuable, and have been eaten for millennia. As such, this family can be said to have widely contributed to Human evolution.
Around 600 genera and more than 13,000 species are currently documented from this family of leguminous, nitrogen fixing plants.Within larger plant families such as this one, various collections of similar looking genera are usefully placed into a number of ‘tribes’.
Therefore we can talk about the ‘clover tribe’ of trifoliate or trefoil species, and the mostly pinnate leaved vetches and peas from the ‘liquorice tribe’. These tribes and a few others all share asimilar flower structure, so are further grouped together as the pea sub-family.
The major identification feature to look out for are the irregular flowers, which are distinctive by the unique shape. From the large garden pea (Pisum spp) and bean (Phaseolus spp) to the tiny flowers of wild clovers (Trifolium spp), all these plants show the samefloral form.
Every one has a ‘banner’ petal (one petal with two lobes looking like two fused petals). This isfound behind two ‘wing’ petals; with a further two petals (usually fused together) appearing as a ‘keel’ at the base.
At the base of the flower are 5 sepals, joined together (calyx tube). The flowers contain 10 stamens, 1 style, and a superior ovary.Typically the fruits of the pea family are set in a pod which splits upwards along the seam.
Species of interest to British foragers include alfalfa (Medicago sativa), the various clovers (Trifolium spp), lupins, (Lupinus spp), a number of vetches (Vicia spp), locust trees (Acacia spp), gorse (Ilex europaeus) and the sea pea (Lathyrus japonicus).
A number of plants in this family are toxic, including the Laburnum tree. Some species require careful preparation before consuming. You can read more on one of our most common pea family plants, red clover, in my foragers monograph.
The lily family plant patterns
Herbaceous bulbous perennials
This is a large, varied, and often showy family of plants. Worldwide there are approximately 250 genera and 3700 species. Many of the plants we grow as ornamentals and many different flowers used in floristry are Lilies.
This family, similar to other families, can be usefully split into sub-families; each one a smaller collection of similar species. You may see reference in books to the ‘asparagus sub-family’, the ‘onion sub-family’, the ‘lily sub-family’ etc.
The majority of this family produce leaves with parallel veins. The leaves are simple and entire. Their foliage is often alternately arranged on the stem, and whorls of leaves are commonly found also.
The lily inflorescence is comprised of regular flowers, typically revealing their indistinguishable sepals and petals (often collectively called tepals).
These always occur in groups of 3 and are generally of the same shape, size, and colour. The flowers usually have 6 stamens, while the fused styles (pistil) are topped by a 3-part stigma.
Occasionally you could mistake lilly plants for similar looking flowers in the Iris family. However, the Iris family only have three stamens and their leaves are seen to be growing from the base of the plant in a flat plane. To confuse matters a little, certain genera in the lilly family contain an inferior ovary whilst others have a superior ovary.
Plant species of interest to the forager include the completely edible onion sub-family, containing a number of different garlic, leek, onion, and chive relatives. You may well be familiar with these onion family plants found in Britain: Bear’s garlic (Allium ursinum), 3-corner leek (Allium triquetrum), rosy garlic (Allium roseum), and crow garlic (Allium vineale).
Other notable edible species in the lily family that can be found in Britain include: Asparagus (Asparagus officinalis), the ‘bath asparagus’ (Ornithogalum pyrenaicum), day lilies (Hemerocallis species), the Century plant (Agave species), and yucca’s (Yucca species).
Some poisonous lily plants found in Britain include the snowdrop (Galanthus species) and the bluebell (Hyacinthoides non-scripta). Wild and bulb garlic have already been covered in my foragers monograph.
The rose family plant patterns
Herbaceous perennials; shrubs; trees
Worldwide, this family contains approximately 4,000 species in just 91 genera. Most of the species are herbaceous and woody perennials, shrubs and trees.
They are usefully split into ‘tribes’, especially the woody species, such as the cherry tribe of stone, or drupe fruits, the rose tribe of shrubs, and the pome fruits of the apple tribe of trees.
Herbaceous plants tend to produce their fruits as achenes, arising on a fleshy or dry receptacle, as in the strawberry or cinquefoils.
These well known plants typically have five separate petals in their flowers with numerous stamens, as in the brambles (Rubus spp) or apples (Malus spp).
Some members of the family have petals in groups of four, as found on the burnet’s, Lady’s mantle, and some cinquefoils. Always remember that where there’s a botanical law, it will likely be broken!
The rose family produce alternate leaves, which arecharacteristically oval in shape, and more often than not with serrated margins. Many in this family are known for having tiny leaf-like growths on the stems known as stipules.
Some plants, like meadowsweet (Filipendula ulmaria) and agrimony (Agrimonia eupatoria), will have small leaf-like growths visible on the mid-ribs. These are intercalary leaves, not true leaves.
Some rose plants have simple leaves, such as the cherry. Others have compound leaves (brambles). A number of species have pinnate leaves, including meadowsweet and the rowan tree. Medicinally they are known for their astringency, due to tannins. This makes them good wound herbs, especially for excessive bleeding, internally or during periods.
Some plants will have cyanide compounds present in leaves and fruit. These cyanogenic glycosides are medicinally valuable in small concentrations and are responsible for the almond scent and flavour in a number of the Prunus genus of plants.
The daisy familyplant patterns
Annuals; herbaceous perennials; shrubs; trees
One of the largest plant families with approximately 1,100 genera and 30,000 species!
These plants are distinguished by composite flower heads borne on a single stem, as displayed by the sunflower (Helianthus annum).
What appears to be one big flower is actually a multitude of tiny individual flowers.
The petal-like appendages observed on many composite flower heads are technically ray florets. At the base of these florets you will find the usual floral reproductive structures.
The ray florets surround a circular array of numerous small individual flowers known asdisk florets, which have no petals. The individual flowers are formed of a corolla tube. Many of the species in this family have flowers subtended by a group of overlapping leaf-like bracts, which in the thistle tribe is known as an involucre.
Typically, the flowers of wild family members found in Britain will have yellow or white ray florets, and yellow or white disk florets. Occasionally orange and blue colours will also be found, i.e. Chichorium intybus (Chichory).
Daisy family chemistry is fascinating (See plant chemistry handouts!). Some members of the family are aromatic, such as chamomile and mugwort, while others are not. One prevalent class of compounds found in the daisy family are sesquiterpenes. These aromatic molecules are somewhat volatile, though not as readily as monoterpenes, and plants with high concentrations of sesquiterpenes, often attached to lactones, as in Dandelion, wormwood and others, willl also impart bitterness.
This family are known for producing and storing their carbohydrate in the form of inulin, rather than starch. Inula helenium (Elecampagne), Jerusalem artichokes (Helianthus tuberosum), and burdock (Arctium lappa) are three plants known for their high concentrations of inulin
The leaves of the daisy family have no stipules. Many unusual foods such as the tuberous rooted Dhalia spp come from this family.
The mustard family plant patterns
Annuals; biennials; herbaceous perennials
Believed to contain around 370 genera and approximately 4000 species.
These plants are recognised by theflowers displaying the shape of a cross (hence their previous family name and the term ‘cruciferous plants’). Large numbers of the mustard family populate our towns and country.
Their flowers have 4 free petals and 4 free sepals, and typically 6 stamens (sometimes fewer) with a superior ovary. Certain plants have four stamens
Just before flowering you will likely notice a familiar ‘broccoli’ like flower bud on Brassica family plants. This will be apparent on all members of the family. Well known plants include: Shepherds purse (Capsella bursa pastoris), mustard (Brassica spp) radish, Raphanus spp, and bittercres species such as ladies smock (Cardamine pratensis).
Compare this family to the poppy family which also have four petals, a superior ovary, but many stamens; or even some ‘potentillas’ from the rose family, which again, have 4 free petals and many stamens. The willow-herb tribe from the evening primrose family (Onagraceae) also have 4 petals, but with an inferior ovary.
The Mustard family plants produce seed pods which split open to reveal spherical seeds. In terms of their chemicstry, species in this family often produce acrid, sulphurous compounds, giving them their characteristichot, peppery taste. For foragers then, this is one of our finest and completely edible families.
The dock familyplant patterns
Annuals; herbaceous perennials
One of our completely edible plant families. There are approximately 1200 species in just 48 genera.
These plants known for having individually small, green, triangular/heart-shaped flowers without petals, borne in clusters on long acutely-angled stalks. The simple leaves have un-toothed, (or entire) margins.
Aside from the well known and ubiquitous docks (Rumex spp), this family includes buckwheat (Fagopyrum esculentum), japanese knotweed (Fallopia japonica), common sorrel (Rumex acetosa), and rhubarb (Rheum rhabarbarum). This latter plant reminds us that just because one part of a plant is edible, does not mean that other parts of the same plant are edible!
The stems are often swollen at the nodes, a family trait giving rise to the name of Polygonaceae(literally meaning ‘many-knees’).
Many species will contain the substance oxalic acid, which imparts a distinctive sour, acidic taste.
The figwort family plant patterns
Annuals; biennials; herbaceous perennials
These plants are a little similar to the labiates and are closely related families.
The bisexual flowers are mostly irregular.
They have4 or 5 sepals, often at least partially united, with 4 or 5 petals united as a tube.
The tube is usually 2-lipped with 2 lobes above and 3 lobes below.
There are usually 4 stamens in 2 pairs, but a fifth stamen is present in some.
The fruits are a many seeded capsule rather than nutlets as in the mint family. Well known plants from this family include the foxglove (Digitalis purpurea), speedwells (Veronica spp), and mullein (Verbascum thapsus).
The beetroot family plant patterns
Annuals; biennials; herbaceous perennials; shrubs
Although now widely placed into the Amaranth family, you will find reference to the Chenopodiaceae family in many books. There are approximately 2000 species and 165 genera in the Amaranthaceae family.
The Chenopodiaceae sub family are also known as the goose-foots. They are characterised by their tiny, individually inconspicuous flowers, often on branched stems. All members of the this sub family are edible, including Beetroot (Beta vulgaris), samphire (Salicornia spp) and qunioa (Chenopodium quinoa)
The dusty pollen betrays them as true flowers. Most family members have roughly triangular shaped leaves, often covered with a coating of shiny dusty dots.
When eaten raw they are often mealy to taste, and are reasonably high in oxalic acid.
If you spot a weedy plant in your area or garden without any obvious flowers, then it is likely one of the beetroot family.
The buttercup family plant patterns
These are notoriously tricky to define. This family has been called the most ancient of the plant families due to its floral arrangement, in contrast to the daisy family which is known to be the most recently evolved. ]
Within the family there are approximately 2,000 species in 43 genera
It has been written that the lack of a noticeable pattern is the most identifiable pattern of this family. Buttercups (Ranunculus spp) have their petals attached below a superior ovary.
They can have anything from 3-15 sepals and 0-23 actual petals. Most buttercups have bisexual flowers. A major property of the buttercups is the bitter, acrid taste they impart if nibbled on. The Aconitum and Delphinum genera contain very toxic terpene alkaloid molecules which act upon the central nervous system (C.N.S).
Foraging coltsfoot – An ancient and potent herbal medicine for the lungs
Tussilago farfara – Coltsfoot. Asteraceae family
We have been foraging coltsfoot for medicine for thousands of years, and its importance to our materia medica remains.
We know from Roman times that this herb was one of our ‘go-to’ remedies for respiratory disorders. Such was its prominence, if you were to walk into an apothecary in the 17th and 18th Century, you would recognise this flower immediately from the picture on the signage outside.
Coltsfoot is a small, creeping perennial herb, notable for its habit of producing beautiful yellow dandelion-esque flowers in late winter and early spring, before its leaves appear.
As a result of this floral phenomenon, the ancient Latin name given to it by botanists of the renaissance period (before Linnaeus and his binomial classification), was Filius ante patrem, which means ‘the son before the father’. The ancient apothecary physicians used this flower as the emblem for their shops, and it is still used by many herbalists today.
This plant is one of 15 different species in the genus. Many scientific plant names contain clues as to a plant’s origins, or its favourite habitat, and sometimes to a plants main actions or uses. With coltsfoot, the generic name Tussilago offers the hint towards its medicinal use.
It has been a popular anti-tussive (cough reflex inhibitor) herb for centuries and recent research is backing up some of the ancient claims. The specific name farfara, is apparently derived from the ancient name for the white poplar tree (farfarus) whose leaf colour and form resembles coltsfoot somewhat. Our ancestors obviously thought it looked like the foot of an animal, hence the name coltsfoot.
What to look for when foraging coltsfoot.
This is a hardy plant, native to Europe, West Asia, and North Africa. It re-emerges each year from a rootstock of stout, scaly, white (ish) rhizomes. These give rise firstly to its yellow flowers, before the long-stalked, somewhat hoof-shaped, sea-green leaves appear.
The leaves will typically grow somewhere between 10-25 cm long. They have a few, small angular teeth on somewhat undulating margins.
The leaf surfaces when young are covered with loose, white, woolly hairs, but those on the upper surface will fall off as the leaf quickly grows and expands. The broad leaves have angled, sometimes pink-tinged, main veins, running away from the central vein, akin to the burdock to which coltsfoot is not too distantly related.
Coltsfoot’s composite flowers are pretty similar in appearance to the dandelion at first glance, although the flower stems are quickly seen to be different. Coltsfoot’s terminal flowering stems are scaly and slightly woolly (unlike the dandelion), topped with striking yellow flower heads. More information on how to identify the daisy family can be found in my plant family patterns article.
These striking blooms consist of yellow disc florets and yellow linear ray florets (unlike dandelion which has ray florets only). The flowers will generally grow to no more than 20-25 cm high, and always appear before the leaves have emerged.
As with many of the daisy family plants, coltsfoot produces a spherical seed head of tiny fruits (achenes), attached to downy white, silky, pappus hairs. Goldfinches were known to line their nests with these soft hairs, as were the Highland peoples of Scotland, who reportedly suffed mattresses and pillows with them.
This plant used to grow far more abundantly throughout England. Yet it can still easily be found on a range of sites up to altitudes of 950 metres. These include waste-grounds, along the sides of railway banks, on cliffs and dunes, and occasionally on roadsides. It grows as well in wet ground as in dry situations.
Nowadays however, with the ever increasing development in 21st century Britain, its abundance has been curtailed somewhat, especially in urban areas. However, when foraging coltsfoot, you will find it still thrives in towns, in any place that remains a little wild, rough, and unkempt.
Be sure it is not the young leaves of Butterbur (Petasites officinalis, syn P.vulgaris syn P.hybridus), or the winter heliotrope (Petasites fragrans) you are collecting by mistake when you are foraging coltsfoot! To help your identification, I have covered winter heliotrope in my foraging videos.
Both of the Petasites resemble coltsfoot in flowering habit and leaf shape, although butterbur is less likely to be mistaken when mature, because its leaves are so much larger than coltsfoot’s.
Both of the Petasites species have more rounded leaves, and without the slightly angled and toothed margins or the white downy fuzz. Butterbur can frequently be found dominating areas of canal and river banks.
Winter heliotrope will similarly be found in large carpeting expanses, be this at the edges of woodlands or hedgebanks, as well as other shady spots.
Coltsfoot loves life by the sea. On the Jurassic coast in Dorset for example, and repeated on much of our coastline, this plant grows in reasonably large populations. When I was there in 2011, it was clearly enjoying the North West coast of England close to the Lake District, enjoying the long stretches of sandy dunes and eroding field / beach edges to be found there.
Coltsfoot has been classed as an invasive plant not suitable to garden cultivation by the RHS, but to be fair, this organisation is not widely known for either their medicinal herb gardens, or specialisation in wild medicinal plants, or come to think of it, organic gardening principles.
You, like me, may think that invasiveness and rapid colonising of bare soil is a valuable asset in the medicinal herb gardener’s fight against weeds. If I had a medium-large medicine garden, then this plant, along with other effective ground-covering medicinal species, such as ground ivy (Glechoma hederaceae), would be a most welcome and valued addition to the medicine cabinet.
Parts used Leaves and flowers (the flowers were formerly much used, but not so today as you will shortly discover).
Harvest Leaves: when fully-grown. Flowers just before opening.
Pharmacology and uses Coltsfoot was formerly a prized pulmonary tonic and curative against emphysema, chronic bronchitis and whooping cough. There are still many reasons to go foraging coltsfoot.
Culpepper mentions that “…the fresh leaves, or juice, or syrup thereof, is good for a bad, dry cough, or wheezing and shortness of breath”.
The substantial amount of mucilage in coltsfoot confers the demulcent and expectorant activities.
This is also true of other soft leaved plants, such as mallows (Malva spp) and mullein (Verbascum thapsus), and is something worth remembering when out and about foraging…namely, that soft-to-the-touch leaves, usually mean a soft and demulcent medicinal action when taken internally.
Previously, this meant that many people smoked the flowers to help with coughs. The ancients of Greece and Rome were known to advises this, including Dioscorides, Galen and Pliny. We now know that this method is not the best way forward, although you can still find coltsfoot in a number of herbal ‘tobacco’ blends.
Just like its relative elecampagne (Inula helenium), the roots and flowers of coltsfoot have been used to make a cough sweet. Boiled in honey or sugar syrup, a type of ‘rock’ made with coltsfoot was once a popular remedy to alleviate coughs and asthma, which was especially useful to people who almost unfailingly were to sit in dusty churches for a few hours, at least once a week.
The overall anti-inflammatory action of coltsfoot is reportedly similar to the pharmaceutical drug indometacin. The water-soluble polysaccharides are partly responsible for the anti-inflammatory action, as they are in a number of other species in the daisy family. The trace element zinc, reportedly found in reasonabaly high amounts in coltsfoot, also adds to the anti inflammatory action.
The alkaloid tussilagine has been demonstrated as an effective cardiovascular and respiratory stimulant. However, as with a number of plants containing the pyrrolizidine alkaloids, liver toxicity from chronic low exposure has been demonstrated in tests, albeit mainly on rats.
Further to this, pregnant women are known to pass on toxic pyrrolizidine compounds to their unborn child, resulting in at least one reported case of fatal, hepatic veno-occlusive disease. This death was of a newborn infant whose mother had regularly taken cups of herbal tea containing coltsfoot and a Senecio species (a genus also known to contain pyrrolizidine alkaloids).
It is now believed the budding flowers of coltsfoot contain the highest concentrations of these compounds, so current advice from pharmacologists is usually that only the leaves should now be used in a tea, and not for prolonged use.
Coltsfoot has been shown to be anti-bacterial against bacteria including Staphylococcus aureus, Proteus spp and Psuedomonas aeruginosa.
It is also a mild diuretic and has been used to treat cystitis. There are no documented adverse drug reactions recorded for coltsfoot.
Coltsfoot leaves have also been used as a vegetable. The downy leaves can be simmered and blended with onion and potato into a thick soup, or the leaves can be steamed like spinach, then served with a knob of butter. Some authors have said the leaves have a liquorice flavour. I do detect a sweetness in coltsfoot leaves, but liquorice is pushing the description somewhat. Well, to my smokers palate at least.
Toxic and poisonous plants: To learn them is to leave them!
When starting out on your foraging adventures, plant identification books should always, always be used so that you can get to know the toxic and poisonous plants. Safety is paramount. If in doubt, leave it out!
The British Medical Association define a poison as “a substance that, in relatively small amounts, disrupts the structure and/or function of cells”. You can read more about the various substances and classes of molecules in this summary of medicinal plant constituents.
The subject of toxicity is an interesting yet by no means simple one. Simplicity would demand an answer to the question…What constitutes a poison? A famous name in medieval alchemical science – Phillip Theophrastus Bombastus von Hohenheim, better known as ‘Paracelsus’ (1493-1541), recognised that…“it depends only on the dose whether a poison is a poison or not”!
Certain drugs, notably many anti-cancer agents (whether natural products or synthetics), are principally used because of their toxicity.
A number of our cultivated plants that we can safely consume in normal dietary amounts are potentially toxic, if consumed in larger quantities.We all know of at least some of the health benefits from eating regular amounts of cabbage or broccoli. However, the knowledge that excessive consumption of cabbages, kale and cauliflowers (all are cultivated varieties bred from the wild cabbage, Brassica oleraceae) can lead to swollen thyroid glands is not so widespread.
Within the fruits of many rose family members are minute amounts of arsenic-based cyanogenic glycosides (in the form of prussic acid – hydrogen cyanide). Arsenic is known to be deadly poisonous. However, the concentrations are usually so low that they have beneficial medicinal effects.
Different plant parts will hold various concentrations of poisonous compounds. Typically the fruits, seeds and roots will contain considerably higher amounts of toxins than the leaves and stems. Some plants will also let you know by their smell that they are inedible. For example, the scent of elder leaves are unpleasant and do not invite eating.
Plant families can be usefully, if roughly, categorised as to their general edibility, medicinal value, and toxicity. Some families are edible and medicinal, others medicinal and toxic, whilst some are downright toxic.
Commonly found plant families; their toxic and poisonous plants.
The dock family.
Although these are edible, there is a need to point out the risks of eating plants with oxalic acid (see medicinal chemistry), the major constituent of sorrel (Rumex acetosa). Oxalic acid is a ubiquitous plant constituent. High oxalate consumption can lead to kidney stones or gout. As a foraged or cultivated vegetable consumed every now and again however, this plant, or indeed the family as a whole, presents little danger.
Oxalic acid is also present in Rhubarb(Rheum spp), as they are in many other plants in this family, along with numerous other unrelated plants. Be sure to wash the leaves of the dock family because they can have chrysophanic acid on the surface which can make the tongue numb. This property apparently gave them the common name of ‘smartweed’ in North America, as when eaten raw they could make the tongue smart!
The lily family.
Many bulbous plants in this family are edible and medicinal (Allium spp), yet bluebells (Endyion non-scriptus syn Hyacinthoides non scriptus) and true hyacinths (Muscari spp), contain toxic substances. The very beautiful, but poisonous autumn crocus (Colchicum autumnale), is found in damp meadows and woodland, especially in a belt of central England from North Dorset up to Shropshire and across to Oxfordshire.
Closely related plants in the Narcissus genus (Amaryllidaceae family) are also toxic, though a substance found in daffodils is known to help with types of dementia. The gorgeous, spring-flowering ‘snakeshead’ fritillary (Fritillaria meleagris), is poisonous due to its alkaloids. These plants are usually quite rare in the wild now, and vary easy to identify with their striking snakeskin pattern, so present no real danger of mistaken picking in reality. During flowering it should be unlikely to be mistaken for edible or medicinal species. Fritillaries do not offer us food or medicine but are a treat for the eyes when stumbling upon them.
The pea family.
These plants, or more specifically the seeds, are often inedible when mature and raw. The ornamental laburnum tree (Laburnum anagyroides) has extremely poisonous seeds. Many of the whole-foods commonly we commonly eat are seeds of this family. These include the soya bean (Glycine max) and kidney beans (Phaseolus spp) amongst others. These plants contain substances such as trypsin inhibitors and certain enzyme inhibiting substances which will otherwise interfere with our digestion and metabolism. Our common wild legumes, including the Vicia (vetches) and Lathyrus (sweet pea)genera, are known to contain trypsin inhibitors.
The nightshade family.
Aside from mostly being very pretty to look at, this family supplies us with a range of different foods, medicines, hallucinogens, and outright nerve toxins. A common nightshade family toxin is the substance solanine. This is a central nervous system toxin and causes dizziness, nausea, diarrhoea, and potentially delirium, shortness of breath, and coma. The well known vegetable aubergine (Solanum melongena), is toxic unless cooked. All parts of the potato (Solanum tuberosum) except for the tubers (unless green) contain solanine.
When foraging, we need to become familiar with the following poisonous plants:
Bittersweet (Solanum dulcamara); populates lanes and hedges throughout Britain. It has a twining, sprawling habit, decorated by its 8-10 cm oval leaves which often have two smaller pointed leaves at the base. From June to September the purple and yellow-coloured flowers are scattered in amongst the green leaves of the hedge and are followed by increasingly noticeable scarlet berries in the autumn. These shiny red berries look enticing, but are to be left for the birds!
The ‘deadly nightshade’ (Atropa belladonna) can be fatal if consumed, yet is reasonably rare outside of the South East of England. It canbe identified by its pointed, 20 cm long oval leaves, and its distinctive flower and fruit. The flowers are produced singularly, or in pairs, and are bell-shaped with more or less parallel sides and blunt lobes. The corolla is striped with a brown-purple or green hue and is succeeded by the solitary, shiny black berry. The fruit sits with the five pointed calyx noticeably persisting behind it. This calyx/berry arrangement is happily unlike any edible berry and should not easily be misidentified for one.
The black nightshade (Solanum nigrum), is a common weed of agricultural fields and gardens alike and probably our most common nightshade. The green berries are poisonous, containing solanine, although the ripe black berries are edible.
The leaves of balck nightshade also contain variable amounts of solanine but this is destroyed by boiling so they can make an acceptable wild green. The leaves also contain the amino acid methionine, which is rarely found in plants.
Bothhenbane (Hyoscyamus niger) and the thorn apple (Datura stramonium) are used in herbal medicine practice, and both are controlled under schedule 3 due to their toxicity. These plants are therefore not advised to be used by unqualified people. Henbane has no resemblance to any edible species found wild in Britain, so is not of any realistic concern to the forager.
Datura on the other hand, although pretty uncommon, could be mistaken for one of the not uncommon beetroot family – the ‘maple goosefoot’ (Chenopodium hybridum). With a similar shape and outline to their leaves, confusion is not impossible even though the foliage of the goosefoot does not smell like Datura. It is safest to avoid picking the maple goosefoot altogether, just in case.
The buttercup family.
The vast majority of this family are quite unpalatable and poisonous to us. Have a nibble of a buttercup leaf and spit it out. They taste acrid, bitter and nasty and do not invite eating! Indeed, one of the most powerful toxins known to man is in this family. The monkshood, also known as wolfbane (Aconitum napellus), has a long historical use as a poison, especially as an arrow poison. It contains the deadly poison aconitine, present in large concentrations in the roots.
A very common climbing-vine known as ‘travellers joy’ or ‘old man’s beard’ (Clematis vitalba),is rare for a buttercup in that it has only four petals not five. This plant has also been documented as poisonous although the young tips are edible with cooking, as this breaks down the irritant compund protoanenomin, common to many buttercup family plants, such as lesser celandine (Ficaria verna). The other common name of this latter plant, ‘pilewort’, will tell you its primary medicinal use!
The carrot family.
The following are all documented as poisonous by the Royal Botanic Gardens at Kew.
Aethusa cynapium – fools parsley –Found in most areas of Britain. Commonly a garden weed. Large prominent bracts.
Berula erecta – water parsnip – Common by waterways. Tastes of parsnip!
Chaerophyllum temulum syn Chaerophyllum temulentum – rough chervil – Common.
Cicuta virosa – cowbane – Very rare, except North-West Wales, Cheshire and South Lancashire areas. Absent South-West. Very poisonous!
Conium maculatum – poison hemlock – Deadly poisonous and widespread over Britain.
Ferula communis – giant fennel – Extremely rare introduction.
Oenanthe crocata –water hemlock dropwort – Deadly poisonous and very common by water.
Oenanthe fluviatilis – river water dropwort – Locally common in South and East Britain. Not widespread.
Oenanthe fistulosa – tubular water dropwort – Locally common in certain areas prone to winter flooding.
Oenanthe pimpinelloides – corky fruited water dropwort – Uncommon but found in Somerset, Dorset, South Gloucestershire, and Hampshire.
Oenanthe silaifolia – narrow-leaved water dropwort – Absent Scotland and Wales. Rare in England, absent in South West.
Oeanantheaquatica – fine leaved water dropwort – Found sporadically from the Severn right along the welsh borders to the Mersey and some parts of East England.
Oenanthe lachenalli – parsley water dropwort – Found around the coast, rarer inland.
Sium latifolium – greater water-parsnip – Common by waterways.
Sium suave – Also (confusingly) commonly known as water parsnip! – Rare.
A number of these poisonous plants contain powerful nerve toxins. Poison hemlock and water dropwort hemlock are both deadly poisonous. They look distinct to each other, yet for the beginner they can appear very similar to a number of other edible umbellifers. This then is one of the overarching issues when foraging for umbellifers. The edible ones look incredibly similar to some of the poisonous ones. Saying this, each of the umbellifer species are said to be distinct to each other, and are not known to hybridize that frequently.
Extreme care and caution should always be exercised when foraging for the carrot family. Avoid foraging for umbellifers next to waterways until you know them really well, for this is where a number of the poisonous ones live. Let’s face it, no one wants to look silly by dying in a hedge after mistaking hemlock for one of the numerous other similar looking umbellifers!
Hemlock contains the extremely poisonous alkaloid, and nerve toxin, coniine. As a very inexperienced, naïve and reckless forager many years ago, I discovered this plant in my mouth seconds after misidentifying it from a peripheral glance as wild chervil, whilst strolling and nibbling on a mixed hedgerow salad (please, don’t ever be this stupid). Its bitterness rapidly turned into unpleasant sensations akin to stinging needles erupting throughout my mouth and I quickly spat it out. Thankfully, I had pinched off only the top inch or so and had yet to swallow, so got away with a short, sharp, shock!
The plants below are all documented as recording a range of photo-sensitive, dermatological effects. These are due to furanocoumarin molecules. If sap from the stems (produced in profusion when flowering) of these plants comes into contact with your skin under the sunlight, then mild blistering may occur, and in the case of giant hogweed, 3rd degree burns. As you will see, some of our common vegetables are included. I know a farmer who has suffered mild burns from cutting down flowering parsnips in the summer sunshine.
It needs to be stressed here that the giant hogweed is, by far, the plant most commonly documented as responsible for the most severe reactions. The others produce much milder effects, which not everyone experiences to the same degree, if at all.
The concentrations of furanocoumarins present, degree of sunlight, and an individual’s constitution will all play a part in reactions experienced following exposure to the sap under sunlight. I happily eat raw, peeled, wild chervil stems in the spring sunshine and do not have any problems from handling the plants.
For safety, I do not touch giant hogweed at all. The ‘drias plant’ I have not yet met. Wearing gloves and harvesting on overcast days or out of direct sunlight is the answer if you are in any doubt. A number of plant families including the spurge (Euphorbiaceae) and citrus (Rutaceae) families also exhibit similar photo-toxic effects.
Other widespread poisonous plants of Britain.
Our native evergreen climber, the common ivy (Hedera helix) produces poisonous berries from November, initially green then turning black through the winter that are best left to the birds. They contain the toxic substance hederin. It was formerly used as a purgative medicine, but one considered too strong for safe self-medicating.
The dogwood (Cornus sanguinea) is a common ornamental and hedgerow plant of the Cornaceae family. Its white spring flowers give rise to black berries in the autumn. They may seem appealing, but leave them alone! Holly, the well known evergreen tree, contains the toxin ilicin in the berries. As little as two of these may induce nausea.
The same advice goes for two previously used strong purgatives, the buckthorn (Rhamnus catharticus),and the alder buckthorn (Frangula alnus). Both shrubs carry black berries in the autumn following flowering. Buckthorn’s broadly elliptical leaves are noticeable for their curving vein patterns. Their small and green flowers have four petals and are borne in clusters at the base of the upper leaves.
Alder buckthorn is thorn-less and also displays small flower clusters. The small white flowers contain five petals, and give rise to a black berry which is red until ripe. Both plants are found occasionally in hedgerows in Britain (although rarer in Scotland).
Look-a-like poisonous and toxic plants
The perils of similar looking yet unrelated species needs a mention at this point. The common ‘lords and ladies’ (Arum maculatum), has often been mistaken for two popularly foraged plants; sorrel and wild garlic (Allium ursinum). I heard from a forager friend that should you try and eat the leaf from the lords and ladies, a sensation akin to the one I described for hemlock will ensue. The leaves contain toxic calcium oxalate crystals. Note that this compound is different to oxalic acid, present in the sorrel and prevalent in other members of the dock family.
Both the common sorrel and lords and ladies have a relatively similar shape to their leaves, especially when small, although their leaf vein patterns are unlike. The favourite habitats are also completely different. Sorrel loves meadows, fields and other grassy areas, whilst lords and ladies is a natural woodland species and hardly ever extends from the protection given by woodlands, roadside verges, hedges, and darker edges of fields.
Beginners reading this may already be aware of the similarity between very young wild garlic leaves and any emerging lords and ladies leaves. The two plants often share woodland and other habitats. Arum does not have parallel veins like wild garlic, and its prominent basal lobes are distinctive, as are the arrow-shape leaves. Compare these to the broadly-elliptical leaves of wild garlic.
This picture demonstrates that edible and potentially deadly poisonou plants will often be found side by side.
Notwithstanding the fact that wild garlic tends to emerge after the lords and ladies is already up, and that the two plants soon display noticeable differences in leaf shape, care should always be taken when you are first foraging. If the leaves are too small to be sure of positive identification, move on. This advice goes for any plant!
Sorrel has a lo-k a-like with a similar habitat, the meadow resident, field bindweed (Convolvulus arvensis). This has similarly-shaped leaves to sorrel, and enjoys sharing some habitats, but it’s striking, raspberry ripple, two-toned flowers and creeping sprawling habit, are completely different to sorrel.
A common poisonous member of our woodlands is the perennial herb, ‘dogs mercury’ (Mercurialis perennis). This poisonous plant can carpet some woodlands and hedge-banks. Dogs mercury can slightly resemble a nettle when in flower for it also has white, thin and wiry clusters of flowers appearing from its upper leaf axils. The rare, but pretty yellow-flowered birthwort (Aristolochia clematis)contains the highly toxic compound aristolochic acid, which causes renal failure.
Our only native member of the Curcubitaceae family – Bryonia dioica, or ‘white bryony’, is also documented as a poisonous plant. Its palmate leaves could be mistaken for hops. Both the plants share similar habitats. The classic pumpkin family characteristic shown in bryony’s spiralling, wrap-around, spring-like tendrils help the plant get into the light. The dainty white flowers can be seen dotted in the hedgerows during the summer months if looking closely. The roots and berries are toxic. An alkaloid, bryonicine, is partly responsible. The young downy shoots stretching up from the soil could be mistaken for hogweed reaching for the light. Red berries follow the flowers.
The unrelated ‘black bryony’(Tamus communis) is the only species in the yam family to grow wild here. Another of our hedgerow climbers, this plant is notable for its dark glossy-green, heart-shaped leaves and scarlet berries. This yam family (Diosceraea) species has been documented as a poisonous plant in some books but edible in others. I have eaten the young tips, which similar to travellers joy, will need cooking to render the toxins present, harmless. The berries are certainly poisonous, but the root reportedly could be eaten if you are prepared to treat it in all number of ways first through boiling and such like. Hmmm, not for me.
I hope you are not now thinking that the land is awash with harmful plants. The reality on the ground is that only four of our poisonous plants here in Britain are likely to be confused with similar looking edible or medicinal species. These are poison hemlock, water hemlock, foxglove and the yew tree. Foxglove is dealt with elsewhere in these pages. The yew tree does not offer the typical coniferous aroma from its foliage and has bright red aril fruits (usually called berries for non botanists) in late summer/autumn. Its fleshy and edible fruits distinguish it from many similar evergreens, as does its growth form, which is more typical of a deciduous tree than a coniferous tree. Remember that all other parts of the Yew could kill you, including the seed, so spit it out if eating the berries.
If you are wanting to learn more about foraging and plant identification, then take a look at my seasonal sets of waterproof I/D cards. These handy pocket sized cards are designed to help your learning in the field.