A cowpea native to Africa, Vigna unguiculata, sometimes Vigna unguiculata subsp. cylindrica, a densely-branched shrubby perennial grown for animal fodder or food.
1991, A. O. Latunde-Dada, Genetic Manipulation of the Cowpea (Vigna unguiculata [L.] Walp.) for Enhanced Resistance ro Fungal Pathogens and Insect Pests, Nyle C. Brady (editor), Advances in Agronomy, Volume 44, page 134,
The Indian cultigroups of V. unguiculata ssp. unguiculata, namely, Biflora (the catjang bean) and Sesquipedalis (the yardlong or asparagus bean), arose probably by selection from the early cowpea domesticates (Faris, 1965).
2012, Tong Kwee Lim, Edible Medicinal And Non-Medicinal Plants, Volume 2: Fruits, page 968,
Catjang bean is considered to have developed in India from cowpea (cultigroup Unguiculata) which originated in West Africa (Ng and Marechal 1985). Catjang is widely cultivated in India, China, Kampuchea, Japan, Korea, Laos, Vietnam, Africa and America.
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