An erect deciduous shrub 1 to 2 ft high, stems angled, glabrous, sometimes sparse and lanky or sometimes sturdy and crowded, internodes often 3⁄4 to 11⁄4 in. apart. Leaves trifoliolate; leaflets linear, mostly 1⁄4 to 1⁄2 in. long, 1⁄16 in. or less wide, hairy, main-stalk very short. Flowers yellow, usually two to four at the tips of the shoots, shortly stalked; corolla 1⁄2 in. long, standard glabrous; calyx 1⁄8 in. long, membranous. Pod 3⁄8 in. to 3⁄4 in. long; glabrous. Flowers in May.
Native of Spain, usually in calcareous districts. It is a curious shrub with very meagre foliage, giving the shoots a spartium-like appearance. It varies much in regard to pubescence: the type is regarded as quite or nearly glabrous, but in var. plumosus Boiss. most of the parts are very noticeably hairy. It appears also to be the more attractive.