| Food security= 5
}}
[[File:Map Vigna unguiculata.gif|thumb|distribution in Africa (wild and planted)]]
[[File:Linedrawing Vigna unguiculata.gif|thumb|1, inflorescence; 2, fruiting branch; 3, seed. Source: PROSEA]]
[[File:Vigna unguiculata 079.jpg|thumb|]]
[[File:Vigna unguiculata 156 RRS.jpg|thumb|]]
[[File:Vigna unguiculata 7467.jpg|thumb|]]
[[File:Vigna unguiculata fruit.jpg|thumb|]]
[[File:Vigna unguiculata II35.jpg|thumb|]]
[[File:Vigna unguiculata Img1812nr0028.jpg|thumb|]]
[[File:Vigna unguiculata.jpg|thumb|]]
plant habit
flowering plants in the field
flowering and fruiting plant
harvested fruits
Sesquipedalis Group, plants on the market
hedge of Sesquipedalis Group
the stringless landrace ‘Eje-O’Ha’
<big>''[[Vigna unguiculata]]'' (L.) Walp.</big>
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{{DISPLAYTITLE:''Vigna unguiculata'' (PROTA)}}
:Protologue: Repert. bot. syst. 1: 779 (1843).
== Synonyms ==
*''Vigna sinensis'' (L.) Hassk. (1844).
== Vernacular names ==
– * Cowpea, black-eye bean, black-eye pea, China pea, marble pea (En). *Niébé, haricot à l’œil noir, pois yeux noirs, cornille, voème, haricot dolique, dolique mongette (Fr). *Caupi, feijão frade, feijão da China, feijão miúdo, feijão macundi, makunde (Po). *Mkunde (Sw). * Yard-long bean, asparagus bean (En).*Haricot-kilomètre, dolique asperge (Fr).*Feijão de metro, feijão chicote, feijão espargo, feijão frade alfange (Po).
– Yard-long bean, asparagus bean (En). Haricot-kilomètre, dolique asperge (Fr). Feijão de metro, feijão chicote, feijão espargo, feijão frade alfange (Po).
– * Catjang cowpea, Bombay cowpea (En). *Catjang (Fr).
== Origin and geographic distribution ==
== Description ==
*Climbing, trailing or more or less erect annual or perennial herb, cultivated as an annual; taproot well developed, with many lateral and adventitious roots; stem up to 4 m long, angular or nearly cylindrical, slightly ribbed. *Leaves alternate, 3-foliolate; stipules ovate, 0.5–2 cm long, spurred at base; petiole up to 15(–25) cm long, grooved above, swollen at base, rachis (0.5–)2.5–4.5(–6.5) cm long; stipels small; leaflets ovate or rhombic to lanceolate, (1.5–)7–14(–20) cm × (1–)4–10(–17) cm, basal ones asymmetrical, apical one symmetrical, entire, sometimes lobed, glabrous or slightly pubescent, 3-veined from the base. *Inflorescence an axillary or terminal false raceme up to 35 cm long, with flowers clustered near the top; rachis tuberculate. *Flowers bisexual, papilionaceous; pedicel 1–3 mm long, with spatulate, deciduous bracteoles; calyx campanulate, tube c. 5 mm long, lobes narrowly triangular, c. 5 mm long; corolla pink to purple, sometimes white or yellowish, standard very broadly obovate, hood-shaped, c. 2.5 cm long, wings obovate, c. 2 cm long, keel boat-shaped, c. 2 cm long; stamens 10, 9 fused and 1 free; ovary superior, c. 1.5 cm long, laterally compressed, style upturned, with fine hairs in upper part, stigma obliquely globular. *Fruit a linear-cylindrical pod 8–30(–120) cm long, straight or slightly curved, with a short beak, glabrous or slightly pubescent, pale brown when ripe, 8– 30-seeded. *Seeds oblong to almost globose, often laterally compressed, 0.5–1 cm long, black, brown, pink or white; hilum oblong, covered with a white tissue, with a blackish rim-like aril. *Seedling with epigeal germination; cotyledons oblong or sickle-shaped, thick; first two leaves simple and opposite, subsequent leaves alternate, 3-foliolate.
== Other botanical information ==
In cultivated ''Vigna unguiculata'' 5 cultivar-groups are generally recognized, although the groups can be crossed readily and overlap:
– * Unguiculata Group (common cowpea): pulse and vegetable types, grown for the dry or immature seeds, young pods or leaves; plant habit prostrate to erect, up to 80 cm tall, late flowering, pods 10–30 cm long, pendent, hard and firm, not inflated when young, many-seeded and seeds not spaced; most African cultivars belong to this group.
– * Sesquipedalis Group (yard-long bean, synonyms: ''Dolichos sesquipedalis'' L., ''Vigna sesquipedalis'' (L.) Fruhw.): grown for the young pods; plant climbing, stem up to 4 m long, pods 30–120 cm long, pendent, inflated when young, many-seeded and seed spaced; important vegetable in South-East Asia, but of minor importance in tropical Africa, where only cultivars introduced from Asia are grown.
– * Biflora Group (catjang cowpea): grown for the seeds, tender green pods and for fodder; plant habit prostrate to erect, up to 80 cm tall, early flowering, pods 7.5–12 cm long, erect or ascending, hard and firm, not inflated when young, few-seeded and seeds not spaced; important in India and South-East Asia, locally also in Africa (e.g. Ethiopia).
– * Melanophthalmus Group: originating from West Africa; plant able to flower quickly from the first nodes under inductive conditions, pods comparatively few-seeded, seed coat thin, often wrinkled, partly white.
– * Textilis Group: a small group only grown in Nigeria for the fibre extracted from the long peduncles; at the beginning of the 20<sup>th</sup> century this group was distributed from the interior delta of the Niger river eastward to the Lake Chad basin, but it is gradually disappearing.
In Africa there are numerous landraces and improved cultivars within Unguiculata Group. Leaves are traditionally picked in cowpea fields grown primarily for the dry seed and belong to the top ten most popular leafy vegetables in many African countries. In addition, special types with erect plant habit or prostrate stems with long tender shoots are grown as a leafy vegetable, sometimes also for the immature seeds or young pods. The use of dual purpose types (seeds and leaves) is becoming very popular in some countries as the leaves are the main vegetable during the early rainy season.
== Author(s) ==
* R. Madamba, Department of Research & Specialist Services, Crop Breeding Institute, Box CY 550, Causeway, Harare, Zimbabwe
Department of Research & Specialist Services* G.J.H. Grubben, Crop Breeding InstituteBoeckweijdt Consult, Box CY 550Prins Hendriklaan 24, Causeway1401 AT Bussum, Harare, ZimbabweNetherlands
* GI.JK.HAsante, Department of Botany, University of Ghana, Legon, P. GrubbenO. Box LG55, Accra, Ghana
Boeckweijdt Consult, Prins Hendriklaan 24, 1401 AT Bussum, Netherlands * I.K. Asante Department of Botany, University of Ghana, Legon, P.O. Box LG55, Accra, Ghana * R. Akromah , Department of Crop and Soil Sciences, College of Agriculture and Natural Resources, KNUST, Kumasi, Ghana
== Correct citation of this article ==
Madamba, R., Grubben, G.J.H., Asante, I.K. & Akromah, R., 2006. '''Vigna unguiculata''' (L.) Walp. [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}}.