Erect perennial to 60 cm tall, glabrous except flowers; stem compressed, scarcely winged but with distinct ribs. Leaves sessile, linear, entire; lamina 10-55 mm long, to 3 mm wide. Flowers in panicles; inflorescence branches usually 1-3 per axil, 2-5-flowered, to 8 cm long; pedicel 8-10 mm long; bracteoles linear, 1.5-1.7 mm long. Sepals glabrous, c. 0.5 mm long. Corolla 10-12 mm long; hairs outside appressed, type iv, grey; wings c. 2.5 mm wide, obsolete above auricle; calli to 3 per row. Ovary gibbous, tomentose except the glabrescent gibbosity, 1.2-1.5 mm long. Fruit orbicular, c. 3 mm diam., gibbous, compressed, wrinkled, glabrous.
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