According to the Pharmacopoeia of China, Amomum villosum and green shell sand are oval or oval, inconspicuous triangles, with a length of 1.5 ~ 2 cm and a diameter of 1 ~ 1.5~2cm. The surface is brown, densely spiny, with perianth residue at the top and usually pedicels at the base. The peel is thin and soft. The seeds are clustered, with three obtuse edges and a white diaphragm in the middle. The seed cluster is divided into 3 petals, each petal contains 5 ~ 26 seeds. The seeds are irregular polyhedrons with a diameter of 2 ~ 3 mm; The surface is reddish brown or dark brown, with fine wrinkles and light brown membranous aril; Hard gray endosperm. Strong fragrance, pungent and cool taste, slightly bitter.

Hainan sand: rectangular or oval with obvious triangle, with a length of1.5 ~ 2cm and a diameter of 0.8 ~1.5 ~ 2cm. The surface is covered with soft spines with flaky branches, and the base is marked with fruit stalks. The skin is thick and hard. The seed cluster is small, with 3 ~ 24 seeds per petal; The seed diameter is 65438±0.5 ~ 2mm. It tastes a little bland.