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368 results
  • Prostanthera ovalifolia R.Br. Lamiaceae Alpine anise bush, Oval leaf Mintbush, Purple mintbush. Woody shrub. Distribution: Australia. Minty flavoured leaves used in jams and jellies. Various essential oils are produced from commercially grown P. ovalifolia (cis-dihydroagarofuran, kessane, 1,8-cineole which is also known as eucalyptol, p-cymene,) and P. cuneata also contains eucalyptol. Concentrations of essential oils in the plants vary according to the clonal variety, growing conditions and time of year. Aboriginal peoples used Prostanthera leaves in medicinal ointments and washes, but one species, P. striatiflora, was used to poison waterholes to kill visiting emu (Hegarty, 2001). Photographed in the Medicinal Garden of the Royal College of Physicians, London.
  • Lathyrus vernus (L.)Bernh. Papilionaceae previously Orobus vernus L. (Linnaeus, 1753) Spring vetchling. Distribution: Europe to Siberia. The seeds of several Lathyrus species are toxic, and when eaten cause a condition called lathyrism. The chemical diaminoproprionic acid in the seeds causes paralysis, spinal cord damage, aortic aneurysm, due to poisoning of mitochondria causing cell death. Occurs where food crops are contaminated by Lathyrus plants or where it is eaten as a 'famine food' when no other food is available. It is the Orobus sylvaticus purpureus vernus of Bauhin (1671) and Orobus sylvaticus angustifolius of Parkinson (1640) - who records that country folk had no uses for it. Photographed in the Medicinal Garden of the Royal College of Physicians, London.
  • Albizia julibrissin Durazz. Fabaceae. Persian silk tree. Called 'shabkhosb' in Persian, meaning 'sleeping tree' as the pinnate leaves close up at night. Tropical tree. Named for Filippo degli Albizzi, an Italian naturalist, who brought seeds from Constantinople to Florence in 1749, and introduced it to European horticulture. The specific epithet comes from the Persian 'gul-i abrisham' which means 'silk flower'. Distribution: South Africa to Ethiopia, Senegal, Madagascar, Asia. Bark is poisonous and emetic and antihelminthic. Various preparations are widely used for numerous conditions and the oxitocic albitocin is abortifacient. However, studies on the seeds and bark of other Albizia species in Africa, demonstrate it is highly toxic, half a kilogram of seeds given to a quarter ton bull, killed it in two hours (Neuwinger, 1996). A useful tree for controlling soil erosion, producing shade in coffee plantations, and as a decorative shade tree in gardens. Photographed in the Medicinal Garden of the Royal College of Physicians, London.
  • Albizia julibrissin Durazz. Fabaceae. Persian silk tree. Called 'shabkhosb' in Persian, meaning 'sleeping tree' as the pinnate leaves close up at night. Tropical tree. Named for Filippo degli Albizzi, an Italian naturalist, who brought seeds from Constantinople to Florence in 1749, and introduced it to European horticulture. The specific epithet comes from the Persian 'gul-i abrisham' which means 'silk flower'. Distribution: South Africa to Ethiopia, Senegal, Madagascar, Asia. Bark is poisonous and emetic and antihelminthic. Various preparations are widely used for numerous conditions and the oxitocic albitocin is abortifacient. However, studies on the seeds and bark of other Albizia species in Africa, demonstrate it is highly toxic, half a kilogram of seeds given to a quarter ton bull, killed it in two hours (Neuwinger, 1996). A useful tree for controlling soil erosion, producing shade in coffee plantations, and as a decorative shade tree in gardens. Photographed in the Medicinal Garden of the Royal College of Physicians, London.
  • Plumbago auriculata Blume Plumbaginaceae Plumbago, Leadwort. Distribution: South Africa. It is used traditionally to treat warts, broken bones and wounds. It is taken as a snuff for headaches and as an emetic to dispel bad dreams. A stick of the plant is placed in the thatch of huts to ward off lightning.” Iwou (1993) reports other Plumbago species are used to cause skin blistering, treat leprosy, induce blistering, and to treat piles, parasites and to induce abortions. The genus name derives from the Latin for lead, but authors differ as to whether it was used as a treatment of lead poisoning, or that when it was used for eye conditions the skin turned the colour of lead. Photographed in the Medicinal Garden of the Royal College of Physicians, London.
  • Ricinus communis L. Euphorbiaceae Castor oil plant. Palma Christi. Distribution: Mediterranean, E Africa, India. The seeds themselves are pretty, brown, bean-like usually with gold filigree markings on them, and the interior of the seed is the source of castor oil. The outer coat of the seed is the source of the poison ricin, famous (infamous) for the umbrella murder of Georgi Markov on Waterloo Bridge in 1978. The KGB are alleged to have killed Georgi Markov, a dissident Bulgarian journalist, with a pellet containing 0.28mgm of ricin fired into his leg using a specially adapted air gun in an umbrella. While his symptoms were those of ricin poisoning, no ricin was ever found in the pellet that was extracted from his leg. Two seeds, chewed and ingested are said to be fatal, but most people vomit and get rid of the toxin. Ducks are resistant to ricin, and need to ingest more than 80 to be fatal! In Peru the leaves are used as a tea for stomach ache, although they contain small amounts of ricin. It is called Palma Christi in early herbals because of the five pointed leaves, which schematically represent a hand. It is a monotypic genus in the spurge family. Photographed in the Medicinal Garden of the Royal College of Physicians, London.
  • Ricinus communis L. Euphorbiaceae Castor oil plant. Palma Christi. Distribution: Mediterranean, E Africa, India. The seeds themselves are pretty, brown, bean-like usually with gold filigree markings on them, and the interior of the seed is the source of castor oil. The outer coat of the seed is the source of the poison ricin, famous (infamous) for the umbrella murder of Georgi Markov on Waterloo Bridge in 1978. The KGB are alleged to have killed Georgi Markov, a dissident Bulgarian journalist, with a pellet containing 0.28mgm of ricin fired into his leg using a specially adapted air gun in an umbrella. While his symptoms were those of ricin poisoning, no ricin was ever found in the pellet that was extracted from his leg. Two seeds, chewed and ingested are said to be fatal, but most people vomit and get rid of the toxin. Ducks are resistant to ricin, and need to ingest more than 80 to be fatal! In Peru the leaves are used as a tea for stomach ache, although they contain small amounts of ricin. It is called Palma Christi in early herbals because of the five pointed leaves, which schematically represent a hand. It is a monotypic genus in the spurge family. Photographed in the Medicinal Garden of the Royal College of Physicians, London.
  • Ricinus communis L. Euphorbiaceae Castor oil plant. Palma Christi. Distribution: Mediterranean, E Africa, India. The seeds themselves are pretty, brown, bean-like usually with gold filigree markings on them, and the interior of the seed is the source of castor oil. The outer coat of the seed is the source of the poison ricin, famous (infamous) for the umbrella murder of Georgi Markov on Waterloo Bridge in 1978. The KGB are alleged to have killed Georgi Markov, a dissident Bulgarian journalist, with a pellet containing 0.28mgm of ricin fired into his leg using a specially adapted air gun in an umbrella. While his symptoms were those of ricin poisoning, no ricin was ever found in the pellet that was extracted from his leg. Two seeds, chewed and ingested are said to be fatal, but most people vomit and get rid of the toxin. Ducks are resistant to ricin, and need to ingest more than 80 to be fatal! In Peru the leaves are used as a tea for stomach ache, although they contain small amounts of ricin. It is called Palma Christi in early herbals because of the five pointed leaves, which schematically represent a hand. It is a monotypic genus in the spurge family. Photographed in the Medicinal Garden of the Royal College of Physicians, London.
  • Ricinus communis L. Euphorbiaceae Castor oil plant. Palma Christi. Distribution: Mediterranean, E Africa, India. The seeds themselves are pretty, brown, bean-like usually with gold filigree markings on them, and the interior of the seed is the source of castor oil. The outer coat of the seed is the source of the poison ricin, famous (infamous) for the umbrella murder of Georgi Markov on Waterloo Bridge in 1978. The KGB are alleged to have killed Georgi Markov, a dissident Bulgarian journalist, with a pellet containing 0.28mgm of ricin fired into his leg using a specially adapted air gun in an umbrella. While his symptoms were those of ricin poisoning, no ricin was ever found in the pellet that was extracted from his leg. Two seeds, chewed and ingested are said to be fatal, but most people vomit and get rid of the toxin. Ducks are resistant to ricin, and need to ingest more than 80 to be fatal! In Peru the leaves are used as a tea for stomach ache, although they contain small amounts of ricin. It is called Palma Christi in early herbals because of the five pointed leaves, which schematically represent a hand. It is a monotypic genus in the spurge family. Photographed in the Medicinal Garden of the Royal College of Physicians, London.
  • Origanum dictamnus L. Lamiaceae Dittany of Crete, Hop marjoram. Distribution: Crete. Culpeper (1650) writes: ‘... hastens travail [labour] in women, provokes the Terms [menstruation] . See the Leaves.’ Under 'Leaves' he writes: ‘Dictamny, or Dittany of Creet, ... brings away dead children, hastens womens travail, brings away the afterbirth, the very smell of it drives away venomous beasts, so deadly an enemy is it to poison, it’s an admirable remedy against wounds and Gunshot, wounds made with poisoned weapons, draws out splinters, broken bones etc. They say the goats and deers in Creet, being wounded with arrows, eat this herb, which makes the arrows fall out of themselves.' Dioscorides’ Materia Medica (c. 100 AD, trans. Beck, 2005), Pliny the Elder’s Natural History and Theophrastus’s Enquiry into Plants all have this information, as does Vergil’s Aeneid where he recounts how Venus produced it when her son, Aeneas, had received a deadly wound from an arrow, which fell out on its own when the wound was washed with it (Jashemski, 1999). Dioscorides attributes the same property to ‘Tragium’ or ‘Tragion’ which is probably Hypericum hircinum (a St. John’s Wort): ‘Tragium grows in Crete only ... the leaves and the seed and the tear, being laid on with wine doe draw out arrow heads and splinteres and all things fastened within ... They say also that ye wild goats having been shot, and then feeding upon this herb doe cast out ye arrows.’ . It has hairy leaves, in common with many 'vulnaries', and its alleged ability to heal probably has its origin in the ability of platelets to coagulate more easily on the hairs (in the same way that cotton wool is applied to a shaving cut to hasten clotting). Photographed in the Medicinal Garden of the Royal College of Physicians, London.
  • Veratrum nigrum L. Melanthiaceae Distribution: Europe. Cows do not eat Veratrum species in the meadows, and human poisoning with it caused vomiting and fainting. In the 1850s it was found to reduce the heart's action and slow the pulse (Bentley, 1861, called it an 'arterial sedative'), and in 1859 it was used orally in a woman who was having convulsions due to eclampsia. Dr Paul DeLacy Baker in Alabama treated her with drops of a tincture of V. viride. She recovered. It was used thereafter, as the first choice of treatment, and, when blood pressure monitoring became possible, it was discovered that it worked by reducing the high blood pressure that occurs in eclampsia. By 1947 death rates were reduced from 30% to 5% by its use at the Boston Lying-in Hospital. It works by dilating the arteries in muscles and in the gastrointestinal circulation. A further use of Veratrum species came to light when it was noted that V. californicum - and other species - if eaten by sheep resulted in foetal malformations, in particular only having one eye. The chemical in the plant that was responsible, cyclopamine, was found to act on certain genetic pathways responsible for stem cell division in the regulation of the development of bilateral symmetry in the embryo/foetus. Synthetic analogues have been developed which act on what have come to be called the 'hedgehog signalling pathways' in stem cell division, and these 'Hedgehog inhibitors' are being introduced into medicine for the treatment of various cancers like chondrosarcoma, myelofibrosis, and advanced basal cell carcinoma. The drugs are saridegib, erismodegib and vismodegib. All the early herbals report on its ability to cause vomiting. As a herbal medicine it is Prescription Only, via a registered dentist or physician (UK Medicines and Healthcare Products Regulatory Agency (MHRA)). Photographed in the Medicinal Garden of the Royal College of Physicians, London.
  • Veratrum album L. Melanthiaceae Distribution: Europe. Cows do not eat Veratrum species in the meadows, and human poisoning with it caused vomiting and fainting. In the 1850s it was found to reduce the heart's action and slow the pulse (Bentley, 1861, called it an 'arterial sedative'), and in 1859 it was used orally in a woman who was having convulsions due to eclampsia. Dr Paul DeLacy Baker in Alabama treated her with drops of a tincture of V. viride. She recovered. It was used thereafter, as the first choice of treatment, and when blood pressure monitoring became possible, it was discovered that it worked by reducing the high blood pressure that occurs in eclampsia. By 1947 death rates were reduced from 30% to 5% by its use at the Boston Lying in Hospital. It works by dilating the arteries in muscles and in the gastrointestinal circulation. A further use of Veratrum species came to light when it was noted that V. californicum -and other species - if eaten by sheep resulted in foetal malformations, in particular only having one eye. The chemical in the plant that was responsible, cyclopamine, was found to act on certain genetic pathways responsible for stem cell division in the regulation of the development of bilateral symmetry in the embryo/foetus. Synthetic analogues have been developed which act on what have come to be called the 'hedgehog signalling pathways' in stem cell division, and these 'Hedgehog inhibitors' are being introduced into medicine for the treatment of various cancers like chondrosarcoma, myelofibrosis, and advanced basal cell carcinoma. The drugs are saridegib, erismodegib and vismodegib. All the early herbals report on its ability to cause vomiting. As a herbal medicine it is Prescription Only, via a registered dentist or physician (UK Medicines and Healthcare Products Regulatory Agency (MHRA)). Photographed in the Medicinal Garden of the Royal College of Physicians, London.
  • Caper spurge (Euphorbia lathyrus. Family: Euphorbiaceae) : Corangil tablets.
  • Caper spurge (Euphorbia lathyrus. Family: Euphorbiaceae) : Corangil tablets.
  • White bryony (Bryonia dioica. Family: Curcurbitaceae) : DF 118 releases the patient from severe pain...without narcotics.
  • White bryony (Bryonia dioica. Family: Curcurbitaceae) : DF 118 releases the patient from severe pain...without narcotics.
  • Lobellia inflata (Lobelia)
  • Helmet flower (Aconitum anthora L.): flowering stem with separate floral segments and a description of the plant and its uses. Coloured line engraving by C.H.Hemerich, c.1759, after T.Sheldrake.
  • Oleander or rose-bay (?Nerium oleander): flowering stem. Watercolour.
  • Monkshood (Aconitum napellus): flowering stem and floral segments. Coloured etching.
  • Dragon arum (Dracunculus vulgaris Schott): leaf and base of stem with tuber. Coloured etching by M. Bouchard, 1774.
  • Ragwort (Senecio jacobaea): flowering stem, flowers and leaves. Pen and watercolour drawings.
  • Chinese lantern (Physalis alkekengi): fruiting stem. Watercolour by B. Bird.
  • Four types of hellebore (Helleborus species): flowering stems and floral segments. Coloured lithograph.
  • Spurge laurel (daphne laureola. Family: Thymelaeaceae) : Myolgin tablets.
  • Spurge laurel (daphne laureola. Family: Thymelaeaceae) : Myolgin tablets.
  • A thistle flower and crab's eyes plant (Abrus species). Watercolour.
  • A tropical plant (Acokanthera spectabilis): flowering stem. Coloured lithograph by W. G. Smith, c. 1872, after himself.
  • Podophyllum peltatum (American mandrake). Also known as 'May apple'.
  • Podophyllum peltatum (American mandrake). Also known as 'May apple'.