Description from Flora of China
Subshrubs [or perennial herbs]. Stipules subulate. Leaves alternate, 1-foliolate; leaf blade margin entire. Racemes axillary, with bracts and bracteoles. Calyx campanulate; teeth 5, subequal. Corolla red to purple. Stamens diadelphous (9+1); anthers uniform. Ovary with many ovules; stigma capitate. Legume articulate and moniliform, indehiscent.
This genus contains good foliage plants and sand-fixing plants. Sugar secreted on the leaves can be used medicinally for treating headaches.
About five species: C Asia to Mongolia, China, and Nepal, Mediterranean region including N Africa; one species in China.
(Authors: Xu Langran (徐朗然 Xu Lang-rang); Kai Larsen)