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Vigna is a genus of plants in the legume family, Fabaceae, with a pantropical distribution. [2] It includes some well-known cultivated species, including many types of beans . Some are former members of the genus Phaseolus .
Vigna unguiculata is a member of the Vigna (peas and beans) genus. Unguiculata is Latin for "with a small claw", which reflects the small stalks on the flower petals. [ 7 ] Common names for cultivated cowpeas include black-eye pea, [ 8 ] southern pea, [ 9 ] niebe [ 10 ] (alternatively ñebbe), [ 11 ] and crowder pea. [ 12 ]
The flowers have a tube calyx about 1 mm long and 5 lobes about 1 mm long as well as a whitish yellow corolla, 4–7 mm long. [20] The fruit is an indehiscent pod almost globose about 2.5 cm in diameter. [20] The plant generally looks like bunched leaves arising from branched stems, which form a crown on the soil surface.
Vigna luteola was first classified as Dolichos luteolus in 1771 by Nicholas von Jacquin, naming it from plants he cultivated in Vienna. In 1859, it was moved to the genus Vigna by George Bentham, classifying it as Vigna luteola. [3] The name Luteola is derived from the Latin luteus, meaning "yellow", in reference to the plant's yellow flowers. [7]
Vigna vexillata is a strong twiner with fusiform, tuberous roots. Its stems are usually clothed with brownish silky hairs, or trichomes.. Its leaflets come in three, which are oval-shaped and pointed at the tip, with the terminal leaflet being 7.5–15 cm (3.0–5.9 in) long.
The black gram or urad bean [a] (Vigna mungo) is a bean grown in South Asia.Like its relative, the mung bean, it has been reclassified from the Phaseolus to the Vigna genus. The product sold as black gram is usually the whole urad bean, whereas the split bean (the interior being white) is called white lentil.
The asparagus bean (Vigna unguiculata subsp. sesquipedalis) is a legume cultivated for its edible green pods containing immature seeds, like the green bean. [1] It is also known as: yardlong bean , pea bean , long-podded cowpea , Chinese long bean , snake bean , [ 2 ] bodi , and bora . [ 3 ]
Flower of V. owahuensis. Vigna owahuensis is an annual or perennial herb growing up to 40 cm (16 in) long. Each leaf has three hairy leaflets of widely varying shape and size. Flowers occur singly or in clusters of up to four. They are light yellow or greenish in color and are about 2 or 2.5 cm (0.79 or 0.98 in) long.