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沙冬青 (Ammopiptanthus mongolicus Cheng f.),又称蒙古黄花木,为豆科沙冬青属常绿阔叶小灌木,通常株高1～2米,多分枝,树皮黄绿色或灰黄色,幼枝密被灰白色绢毛。掌状三出复叶或三角状披针形,少为单叶,叶柄密被银白色绢毛;托叶小,与叶柄连合而抱茎;小叶菱状椭圆形或卵形,先端锐尖、钝或微凹,两面密被银灰色毡毛。总状花序顶生,具8～10花,苞片卵形,被白色绢毛;花萼钟状;花冠黄色,长约2厘米;荚果扁平,线状长圆形,无毛;种子黄绿色,扁圆形。
Ammopiptanthus mongolicus Cheng f., Also known as Mongolian yellow flowers, is a legume sand Astragalus evergreen broad-leaved shrub, usually 1 to 2 meters in height, many branches, bark yellow-green or gray-yellow, young branches and dense Gray-white serice. Palmately three compound leaves or triangular-lanceolate, less as simple leaves, petiole densely silvery white sericeous; stipules small, united with petiole and clasping; leaflets lobed-elliptic or ovate, apex acute , Blunt or slightly concave, both sides dense silver felt felted. Racemes terminal, with 8-10 flowers, bracts ovate, white serice; calyx campanulate; corolla yellow, ca. 2 cm; pod flattened, linear-oblong, glabrous; seeds yellow-green, Oblate.