Mucuna urens

The word mucuna is the vernacular name for Mucuna urens in an indigenous language of Brazil, and in 1763 this word was chosen by the French botanist Michel Adanson in his Familles naturelles des plantes to be the generic epithet for this genus of legumes,{{cite journal |last=Russell Perkins |first=Janet |author-link=Janet Russell Perkins |date=1907 |title=The Leguminosae of Porto Rico |url=https://www.biodiversitylibrary.org/page/3467446 |journal=Contributions from the United States National Herbarium |volume=10 |issue=4 |pages=204, 205 |doi=10.5962/bhl.title.4357 |access-date=6 September 2020|doi-access=free }}{{cite book |last=Van Thuân |first=Nguyên |date=4 December 1979 |title=Flore du Cambodge, du Laos et du Vietnam 17 Légumineuses-Papilionoïdées phaséolées |url=https://www.biodiversitylibrary.org/page/59359636 |editor1-last=Aubréville |editor1-first=André |editor2-last=Leroy |editor2-first=Jean-François |location=Paris |publisher=Muséum National d'Histoire Naturelle |page=30 |language=French |isbn=2-85654-156-9}} although M. urens was itself known as Dolichos urens until being transferred to Mucuna many years later.{{Cite web |title=Mucuna urens (L.) Medik. (1787) |url=https://www.ipni.org/n/1197939-2 |website=International Plant Names Index |publisher=The Royal Botanic Gardens, Kew, Harvard University Herbaria & Libraries and Australian National Botanic Gardens |access-date=6 September 2020}}{{Cite web |title=Mucuna urens (L.) DC. (1825) |url=https://www.ipni.org/n/147602-3 |website=International Plant Names Index |publisher=The Royal Botanic Gardens, Kew, Harvard University Herbaria & Libraries and Australian National Botanic Gardens |access-date=6 September 2020}}

Mucuna urens is a large, vigorous, much-branched, twining liana that climbs into the tree canopy. The stems are thick and soft, and bear alternate, trifoliate leaves with petioles up to {{convert|15|cm|in|0|abbr=on}} long. The leaflets are ovate or elliptical, and up to {{convert|15|cm|in|0|abbr=on}} long; the lateral leaflets are somewhat oblique, and all leaflets have rounded bases and apiculate tips. The inflorescences grow laterally or in the axils of the leaves and are pendulous racemes with peduncles up to a metre long, with the flowering part near the tip. The calyx has a {{convert|1|cm|in|1|abbr=on}} long tube and the petals are thick, waxy and yellowish. The standard is slightly longer than the wings and keel. The flowers are followed by transversely-ridged, oblong pods about {{convert|15|x|5|cm|in|0|abbr=on}} bearing orange-brown bristly stinging hairs; the pods have a suture underneath and two longitudinal, undulating wings. The one to four seeds are rounded, almost surrounded by hilum and {{convert|2.5|cm|in|0|abbr=on}} or more in diameter.{{cite book|author=Quattrocchi, Umberto |title=CRC World Dictionary of Medicinal and Poisonous Plants: Common Names, Scientific Names, Eponyms, Synonyms, and Etymology |url=https://books.google.com/books?id=-37OBQAAQBAJ&pg=PA2571 |year=2016 |publisher=CRC Press |isbn=978-1-4822-5064-0 |page=2571}}{{cite web |url=http://legacy.tropicos.org/Name/13036047?tab=images |title=Mucuna urens (L.) Medik. |work=Tropicos |publisher=Missouri Botanical Garden |accessdate=6 September 2020 }}{{cite book |last=van Roosmalen |first=Marc G.M. |author-link=Marc van Roosmalen |date=1985 |title=Fruits of the Guianan Flora |location=Utrecht |publisher=Institute of Systemic Botany, Utrecht University |page=213 |isbn=90-9000987-6}}

This liana is native to the West Indies, Central and South America, its range extending from Panama to Peru, Ecuador, Bolivia and Brazil. It grows in forests and woodland at altitudes of up to {{convert|1800|m|ft|-3|abbr=on}}.

File:Mucuna urens2.jpg

Mucuna urens is used in traditional medicine. A tincture made from the powdered bean macerated in alcohol is a soothing remedy used against hemorrhoids, especially those inclined to bleed.{{cite book|title=New, Old, and Forgotten Remedies |year = 2012|url=https://books.google.com/books?id=ILGfZW6zgRoC&pg=PA36 |publisher=Nanopath |page=367}} The stinging hairs that grow on the pods can be taken internally against intestinal worms, which are expelled alive. These hairs are irritating to the skin and cause intense itching, with reddening and the formation of tiny pustules, soon after contact; the active chemical is the proteolytic enzyme, mucunain.

Potable water can be obtained from the fleshy stems. Fibres from the stem are used to make strong rope, and the seeds are used to make beads and ornaments, as well as being used as famine food.{{cite web |url=http://tropical.theferns.info/viewtropical.php?id=Mucuna+urens |title=Mucuna urens |author=Fern, Ken |work=Useful tropical plants |accessdate=6 September 2020 }} An extract of the seeds given to male guinea pigs at low dosages was found to cause the degeneration of sperm, raising the possibility that the plant could be used as a male anti-fertility agent.{{cite journal |author=Udoh, P. |author2=Ekpenyong, J. |year=2001 |title=Effect of Mucuna urens (horse eye bean) on the gonads of male guinea-pigs |journal=Phytotherapy Research |volume=15 |issue=2 |pages=99–102 |doi=10.1002/ptr.699 |pmid=11268105 }}

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• {{Commons category-inline|Mucuna urens|Mucuna urens}}
• {{Wikispecies-inline|Mucuna urens|Mucuna urens}}

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urens