单瘤酸模 dan liu suan mo

Herbs annual. Stems erect, 10-30(-50) cm tall, branched from base, glabrous, finely grooved. Lower leaves: petiole 1-1.5 cm, slender; leaf blade lanceolate or elliptic-lanceolate, 1.5-5 × 0.7-1.5 cm, both surfaces glabrous, midvein conspicuous, base cuneate or rounded, margin slightly crisped, apex acute; cauline leaves small, with short petiole 3-5 mm. Inflorescence racemose, several racemes aggregated and panicle-like, leafy. Flowers bisexual. Pedicel slender, articulate at base. Outer tepals elliptic; inner tepals enlarged in fruit; valves ovate-triangular, 2.5-3 mm, only 1 valve with tubercle, base rounded, each margin with 2 or 3 narrow teeth (ca. 1.5 or)4-5 mm, apex narrowly acute; others without tubercles, with shorter teeth, or all valves with subequal teeth. Achenes brown, shiny, ovoid, sharply trigonous, ca. 1 mm, base truncate, apex acute. Fl. Jun-Jul, fr. Jul-Aug.

Riverbanks, waste areas, in sand of lakeshores, moist valleys; 300-1000 m. Nei Mongol, Xinjiang [Kazakhstan, Mongolia, Russia].