Ascending to decumbent perennial to 70 cm long, glabrous except flowers; stem not much-branched, terete, ribbed below, ±triangular above. Leaves sessile, fasciculate in axils, linear to linear-oblong, dentate, glabrous; lamina 10-35 mm long, 1.5-4 mm wide. Flowers in numerous lateral cymo-panicles; inflorescence branches 1-4 together, 3-4-flowered, to 4 cm long; pedicel to 10 mm long; bracteoles oblong, 5-7 mm long. Sepals minute. Corolla 9-12 mm long; hairs outside type i, short and dark grey to black, and type ii, long silky and paler grey; wings c. 2.5 mm wide, smaller above auricle; calli 7-12 per row. Ovary c. 3 mm long; ovule erect. Fruit not seen.
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