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<big>''[[Vigna adenantha]]'' (G.Mey.) Maréchal, Mascherpa & Stainier</big>
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{{DISPLAYTITLE:''Vigna adenantha'' (PROTA)}}
:Protologue: Taxon 27: 202 (1978).
== Synonyms ==
*''Phaseolus adenanthus'' G.Mey. (1818).
== Vernacular names ==
*Wild bean (En). *Pois marron (Fr). *Fava caranguejo (Po).
== Origin and geographic distribution ==
== Description ==
*Perennial climbing herb up to 4 m long, with tuberous roots; stem twining, glabrous or sparsely hairy, rooting at the lower nodes. *Leaves alternate, 3-foliolate; stipules oblong-ovate, 3–6 mm long, base slightly cordate, apex acute, conspicuously veined; petiole 1–14 cm long, rachis 0.5–2 cm long; petiolules 3–4 mm long, hairy; leaflets ovate to rhombic, lateral ones slightly asymmetric, (2.5–)5–10(–14) cm × (1.5–)2.5–6.5(–8) cm, base rounded or truncate, apex obtuse to acute, sparsely appressed-hairy on both sides, venation reticulate. *Inflorescence an axillary false raceme 5–30 cm long, 6–12-flowered; peduncle up to 25 cm long, rachis 2–7 cm long. *Flowers bisexual, papilionaceous; pedicel 2–3 mm long, with ovate-oblong bracteoles 3–4 mm × 2 mm; calyx with tube 3–4 mm long, the 3 lower lobes falcate or narrowly oblong, 3–5 mm long, the upper pair fused into a short, bifid lip, sparsely pubescent; corolla with almost circular standard, 1–2.5 cm × 2–2.5 cm, rose or white with green veins and a green basal eye surrounded by violet-purple inside, wings c. 3 cm long, white-tinged violet, green and yellow at the base, keel c. 5 cm long, with a long beak, spirally incurved for about 3 turns, white to violet-blue; stamens 10, 9 fused but upper one free; ovary superior, appressed-hairy, style slender, strongly curved. *Fruit an oblong pod 7–15 cm × 0.5–1.5 cm, slightly curved, flattened, glabrous or slightly hairy, 9–15-seeded. *Seeds reniform, 5.5–7.5 mm × 4.5–6 mm × 2.5–5 mm, dark reddish brown; hilum central, small, white. == Other botanical information ==
''Vigna'' comprises about 80 species and occurs throughout the tropics. However, studies of the embryological characters indicate that ''Vigna adenantha'' is possibly better classified in the genus ''Phaseolus''.
The seed has a large cavity between the cotyledons which enables it to float, and the distribution pattern of the species indicates that seeds are sometimes dispersed by sea water.
== Ecology ==
''Vigna adenantha'' is found in humid or swampy locations, along the sea shore and rivers, and in cultivated and disturbed areas at low altitudes. ''Vigna adenantha'' is a short-day plant.
== Management ==
For uniform and faster germination, seeds need scarification.
== Genetic resources ==
== Author(s) ==
* M. Brink, PROTA Network Office Europe, Wageningen University, P.O. Box 341, 6700 AH Wageningen, Netherlands
== Correct citation of this article ==
Brink, M. & Jansen, P.C.M., 2006. '''Vigna adenantha''' (G.Mey.) Maréchal, Mascherpa & Stainier. [Internet] Record from PROTA4U. In: Brink, M. & Belay, G. (Editors). PROTA (Plant Resources of Tropical Africa / Ressources végétales de l’Afrique tropicale), Wageningen, Netherlands. <http://www.prota4u.org/search.asp>. Accessed {{CURRENTDAY}} {{CURRENTMONTHNAME}} {{CURRENTYEAR}}.