Herbs 5.5-21 cm tall. Sterile branches arising from leaf axils. Stems glabrous. Leaves opposite; petiole 2-15 mm, brown papillose adaxially and at axil; leaf blade ovate to broadly so, 0.3-1.8 × 0.5-1.8 cm, abaxially glabrous, adaxially sometimes brown papillose, base broadly cuneate to subtruncate, margin 6-16-crenate, apex obtuse. Cyme 1.3-6 cm, 8-18-flowered; bracteal leaves brown papillose at axil, leaf blade broadly ovate, 3.2-6.8 × 3.2-6.5 mm, base usually broadly cuneate, rarely oblique, margin 5-10-crenate. Flowers yellow-green, ca. 3 mm in diam.; pedicel glabrous. Sepals erect, broadly subovate, 1.1-1.3 × 1-1.2 mm, glabrous, apex obtuse. Stamens 8, ca. 0.5-1 mm. Ovary subinferior; styles ca. 0.2 mm. Disc absent. Capsule ca. 2.6 mm; carpels subequal; rostrums ca. 0.4 mm. Seeds red-brown, ellipsoid, ca. 1 mm, smooth, glabrous. Fl. and fr. May-Jul. 2n = 24.
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