Perennial, dwarf, geophytic herb, up to 100 mm high; tuber depressed-globose. Stems 1 or 2 annually, branching from base; glabrous or with minute hairs. Leaves shortly petiolate; blade linear-oblong, up to 15-30 x 7-10 mm, upper surface glabrous, lower surface glabrescent. Flowers: 2-10 at nodes opening almost simultaneously; corolla 35-40 mm long, < 5 mm in diameter, glabrous on outer surface, tube 4-5 mm, cup-shaped, lobes 30-35 mm long, margins recurved, yellowish; Mar. Fruit a follicle.