Snake bean horn (Vigna unguiculata (Linn.) Walp.), also known as snake gourd, snake beans, is an annual climbing herb in the genus Juniperus of the family Cucurbitaceae. Sprawling, plant height of about 3 meters, vigorous growth, strong branching, fruit long columnar, generally in 1.30-1.70 meters, the ends of the acuminate thin, the end is often bent into a snake-like, light green epidermis, flesh bright green, fleshy and fluffy.

Snake gourd root system is developed, lateral roots, easy to give birth to indeterminate snake gourd root, stem trailing slender, up to 5-8 meters long, stem five-angled, green, strong branching ability, leaf blade green, palmate cleft, fissure is more rounded, the leaf surface has a fine tomentum, the corolla is white, the flowers are unisexual, the male and female are equally heterozygous, the male flowers are mostly racemes, buds for the lime green, light yellowish-green, the male flower occurs earlier than the female flowers, the female flower generally The male flowers occur earlier than the female flowers, generally the female flowers begin to bear in the main vine at 20 to 25 nodes, and later the main vine and lateral vines can bear female flowers continuously. The young melon is slender, cylindrical or curved, the apex and base of the melon are thin and snake-like, the skin is grayish-white with green stripes, the flesh is white and soft, the mature melon is light reddish-brown and the flesh is loose. Seeds nearly oblong, there are two small parallel grooves, rough surface, light brown, thousand grains weight 200 ~ 250 grams.