(L.) Caddick & Wilkin
Dioscorea communis (sometimes placed in the segregate genus Tamus) is a species of flowering plant in the yam family Dioscoreaceae and is commonly known as black bryony, lady's-seal, and black bindweed.
It is a climbing herbaceous plant growing to 2–4 m tall, with stems that twine clockwise.:102 The leaves are spirally arranged, heart-shaped, up to 10 cm long and 8 cm broad, with a petiole up to 5 cm long. It is dioecious, with separate male and female plants. The flowers are individually inconspicuous, greenish-yellow, 3–6 mm diameter, with six petals; the male flowers produced in slender 5–10 cm racemes, the female flowers in shorter clusters. The fruit is a bright red berry, 1 cm diameter. Its fairly large tuber is, like the rest of the plant, poisonous.
Dioscorea communis is a typical plant of the forest understory, from the sea to the mountains, usually in dense woods, but it can also be found in meadows and hedges.
All components of the black bryony plant, including the tubers, are poisonous due to saponin content, so it is not typically used internally; however, it has been used as a poultice for bruises and inflamed joints. It has been suggested that black bryony be used topically with caution, due to a tendency for the plant to cause painful blisters.
Black Bryony is highly poisonous and should not be ingested at all at least when raw. When cooked, young shoots are commonly eaten in southern France, Spain, Portugal, Italy and Croatia.
The rhizome contains phenanthrenes (7-hydroxy-2,3,4,8-tetramethoxyphenanthrene, 2,3,4-trimethoxy-7,8-methylenedioxyphenanthrene, 3-hydroxy-2,4,-dimethoxy-7,8-methylenedioxyphenanthrene, 2-hydroxy-3,5,7-trimethoxyphenanthrene and 2-hydroxy-3,5,7-trimethoxy-9,10-dihydrophenanthrene).
- Kew World Checklist of Selected Plant Families.
- "Dioscorea communis". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 31 March 2015.
- Blamey, M.; Fitter, R.; Fitter, A (2003). Wild flowers of Britain and Ireland: The Complete Guide to the British and Irish Flora. London: A & C Black. ISBN 978-1408179505.
- Altervista Flora Italiana, Tamaro, Dioscorea communis (L.) Caddick & Wilkin includes photos plus European distribution map
- Govaerts, R., Wilkin, P. & Saunders, R.M.K. (2007). World Checklist of Dioscoreales. Yams and their allies: 1-65. The Board of Trustees of the Royal Botanic Gardens, Kew.
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- Blamey, M. & Grey-Wilson, C. (1989). Flora of Britain and Northern Europe. Hodder & Stoughton. ISBN 0-340-40170-2.
- Flora Europaea: Tamus communis distribution Royal Botanic Garden Edinburgh, Inverleith Row, Edinburgh, EH3 5LR, United Kingdom(2008).
- "Black bryony (Tamus communis,Dioscorea communis) - Mango's Market".
- Phenanthrenes and a dihydrophenanthrene from Tamus communis and their cytotoxic activity. Adriána Kovácsa, Peter Forgob, István Zupkóc, Borbála Réthyc, György Falkayc, Pál Szabód and Judit Hohmanna, Phytochemistry, Volume 68, Issue 5, March 2007, Pages 687–691, doi:10.1016/j.phytochem.2006.10.028
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