Herbs annual, dwarf. Stems erect, usually tufted, reddish, 3-8 cm tall, slender, glabrous; branches spreading. Leaves alternate, rarely opposite above; petiole 1-3 mm, glabrous; leaf blade broadly elliptic, obovate, or nearly orbicular, 3-5 × 2-4 mm, both surfaces glabrous, sparsely puncticulate, base broadly cuneate, margin entire, apex obtuse; ocrea lax, brown, 1.5-2 mm, thinly membranous. Flowers axillary, fascicled. Perianth greenish, 3-parted; tepals broadly elliptic, ca. 1 mm. Stamens 3, shorter than perianth. Styles 2 or 3, very short; stigmas 2(or 3), capitate. Achenes brown, dull, 1.2-1.5 mm, granular. Fl. Jul-Aug, fr. Aug-Sep. 2n = 28.
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Plants (0.5-)1-8(-20) cm. Stems often reddish, branched or simple, rooting adventitiously from proximal nodes. Leaves: ocrea brownish, broadly funnelform, 1-1.5 mm, margins oblique; petiole (0.1-)2-10 mm; blade 1-6.5 × 1-5 mm, base tapering to truncate, apex obtuse to acute, glabrous. Pedicels 0.1-1.5 mm or absent. Flowers: perianth 0.9-1.8 mm; tepals ovate to elliptic, margins entire, apex obtuse; stamens ca. 1/ 2 as long as tepals. Achenes 1-1.8 × 0.7-0.8 mm, dull. 2n = 14 (Mongolia, Norway), 28.
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