Perennial herb. Rootstock with fascicle of fusiform roots. Stems 1-2, unbranched or sparingly branched about the middle, up to about 0,45 m tall, glabrous. Leaves ascending, subsessile, very variable, linear, oblong, ovate-oblong or elliptic-oblong, 20-40 x 3-12 mm, scabrous on midrib below and usually minutely ciliate. Flowers in fascicles of 2-6 (1); pedicels 2-6 mm long. Sepals lanceolate, 2 mm long. Corolla up to about 4 mm long, divided almost to base; lobes suberect, ovate or oblong with recurved margin, keeled down inner surface, ciliate with minute papilla-like hairs, white-tipped with pink, light purple or pale greenish yellow. Corona arising i up staminal column, outer lobes 5, bilobulate, appearing 10-lobed, ± equalling staminal column, ciliate and usually with scattered papilla-like hairs; inner lobes ± linear, incumbent on backs of anthers. Follicles 1-2, slender, up to 0,15 m long.