Amomum cardamom is also known as Bony, Shell, Amomum cardamom, Baikou and Kouren. Amomum villosum is the fruit of Amomum villosum, a perennial herb of Zingiberaceae. From October to December, the fruit is yellow-green, and it is taken when it has not cracked. Mainly produced in Vietnam, Thailand and other places, but also cultivated in Guangdong, Guangxi and Yunnan. The original plant is born in the forest with warm and humid climate and rich humus.

The plant morphology of Amomum villosum:

The stems are clustered, the plant height is 3m, and the leaf sheaths at the base of the stems are green. Leaf blade ovate-lanceolate, about 6 cm long and 12 cm wide, with tip and tail tip, smooth and hairless on both sides, nearly sessile; Ligule round, 7-1 mm long; Leaf sheath mouth and tongue are densely covered with coarse hairs.

Spikes emanate from the rhizome near the stem base, which are cylindrical, sparsely conical, 8-11 cm long and 4-5 cm wide, and are closely covered with bracts arranged like tiles; Bracts triangular, 3.5-4 cm long, straw yellow, with obvious grid pattern.

The bracteoles are tubular and split on one side; Calyx tubular, slightly reddish white, villous outside, with three teeth at the top, corolla tube nearly equal to calyx tube, lobes white, oblong, about 1 cm long and 5 mm wide; The lip is oval, about 1.5 cm long and 1.2 cm wide, with yellow center, concave, yellow-brown edge and pedicel at the base; Stamens recurved, connective adnexa trifid, about 3 mm long; Ovary villous.