Perennial herb, up to 150 mm high, with fusiform roots. Stems 1 or 2, well branched throughout; angular or ribbed; glabrous or sometimes sparsely hairy. Leaves subsessile; blade linear-oblong to narrowly ovate, 15-30 mm long, few hairs mainly on margins and midrib below. Flowers: corolla with no tube, lobes 3-4 mm long, free at tips, white, pale yellow or greenish; Oct.-Dec. Fruit a follicle.
Perennial herb, 150 mm tall. Stems angular or ribbed, glabrous or sometimes sparsely hairy. Corolla with no tube, lobes 3-4 mm long, free at tips. Flowers white to pale yellow or greenish.