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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 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 purple, non-fragrant, invasive flowers of the "Phaseolus giganteus" are said to have snail or snail-shell shaped flowers, hence the origin of the common name.The multicolored, fragrant, non-invasive flowers of the Cochliasanthus caracalla are said to have corkscrew or nautilus-shell shaped flowers, hence the origin of that common name.
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]
Mung bean (Vigna radiata) is a plant species of Fabaceae and is also known as green gram. [10] It is sometimes confused with black gram (Vigna mungo) for their similar morphology, though they are two different species. [11] The green gram is an annual vine with yellow flowers and fuzzy brown pods.
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.
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.