Alias: Dou Shi, Yan Dou, Jujube, Shimi, Jujube, Rhizoma Corydalis, Eupatorium adenophorum, Crataegus pinnatifida, Dragon Ball and Sedum.
Orchidaceae, perennial evergreen creeping grass. Aerial roots whisker-like, white. Rhizomes are slender, transverse, jointed, pseudobulb, green, small, oval and angular. Pseudobulb's top leaf 1, narrowly elliptic or elliptic, long1.5 ~ 3cm, emarginate tip, concave midvein and entire margin. Umbellies extend from the base of pseudobulb with slender stems and 4-6 flowers; These flowers are light yellow. Capsule ovoid. The flowering period is from June to August. Born in wet places on cliffs, it is also attached to tree trunks.