Herbs annual. Roots solitary, spinose or conic. Stems branched at base, violet, slender, 10--12 cm, pubescent. Leaf blade linear-lanceolate, 0.5--1.5 cm × 1--2 mm, both surfaces tuberculate, base cuneate, margin sparsely ciliate, apex acute. Cymes few flowered (sometimes a small, female flower arising from stem base); bracts similar to leaves but smaller. Pedicel 1--1.5 cm, shortly glandular hairy. Sepals 5, lanceolate, 4--5 × 1--1.5 mm, sparsely shortly glandular hairy abaxially (with nodose hairs in female flower from stem base), base broadened, margin membranous, apex acute. Petals 5, white, obovate, 8--9 mm, apex entire (equaling sepals and denticulate in female flower from stem base). Stamens 10, slightly shorter than sepals. Ovary ellipsoid (ovoid in female flower from stem base). Styles 3 (or 4 in female flower from stem base), linear. Fl. Jul--Aug.
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