Herbs annual. Stems erect, purplish red, 15-30 cm tall, branched from base, finely grooved. Lower leaves: petiole 1-3 cm; leaf blade oblong or lanceolate-oblong, 3-7 × 0.8-2 cm, both surfaces glabrous, with conspicuous midvein, base rounded or broadly cuneate, margin slightly crisped, apex acute, cauline leaves shortly petiolate or nearly sessile, small, upper ones linear-lanceolate; ocrea fugacious, membranous. Inflorescence terminal, racemose, leafy. Flowers bisexual. Pedicel articulate at base. Outer tepals lanceolate, ca. 0.5 mm; inner tepals enlarged in fruit; valves triangular-ovate, 2-2.5 × 1-1.5 mm, all valves with tubercles, base rounded, each margin with 3 or 4 pairs of narrow teeth, apex narrowly acute; teeth 1-1.5 mm. Achenes shiny, ovoid, 1-1.5 mm, sharply trigonous, apex acute. Fl. Jun-Jul, fr. Jul-Aug.
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