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geminal plants, legumes, butterfly flowers, and alfalfa (
) in the genus Medicago
(
M
.
sativa
) Nanding (
M
.
s
) and so on. A one-year or perennity herb. Stems stand upright or spread. Complex leaves, with
3
leaves, the upper edge of the small leaves have fine teeth, the leaves are attached to the base of the leaf handle. Flowers are small, yellow or purple, in short or head-shaped flower sequence, raw. The teeth are nearly equal in length, the flaps are round or inverted, and the males (
9
)
1
two groups. The fruit spirals or bends, is small and does not crack. Seed kidney or rectangle. Mostly wild, cultivated all over china. For good feed plants, but also can be used as green fertilizer.