Lycium ostrum, a New Species of Lycium (Solanaceae) from Qinghai, China

The new species Lycium ostrum J. Z. Dong (Solanaceae) from Qinghai Province, China, is established and illustrated. It has a close association with L. ruthenicum Murray but is distinguished by several morphological characters: a slender, flexible stem, with thorns occurring at the nodes or not, usually clustered with leaves and flowers, and brown, globose berries, usually with a groove at the apex, the pedicel 15–20 mm long, and seeds numbering 10 to 20.