Erect or ascending perennial to 70 cm tall; stem conspicuously ribbed, glabrous. Leaves sessile, linear to oblong-elliptic, revolute, entire or sometimes with few teeth, glabrescent above, white-tomentose below; lamina 9-21 mm long, 2-11 mm wide. Flowers in panicles; inflorescence branches solitary in lower axils, up to 3 clustered in upper axils, to 10 mm long, mostly 1-flowered; pedicel 0.5-1 mm long; bracteoles linear to oblong, 4-7 mm long. Sepals hidden by hairs, 0.2-0.5 mm long. Corolla 10-15 mm long; hairs outside long, type v, grey; wings 2.5-3 mm wide, slightly smaller above auricle; calli 6-10 per row. Ovary 1.5-1.7 mm long; ovule erect. Fruit obovoid, to 4 mm long.