Description from Flora of China
Herbs 12.5-22 cm tall. Sterile branches well developed, brown pilose. Stems slender, brown pilose. Cauline leaves opposite; petiole ca. 5 mm, brown pilose adaxially, marginally, and at axil; leaf blade broadly ovate, ca. 6 × 6.5 mm, adaxially brown pilose, base rounded, margin ca. 12-crenate, teeth brown 1-ciliate at apex. Cyme ca. 3.6 cm, ca. 14-flowered; branches glabrous; bracteal leaves with petiole 0.7-2 mm, brown papillose at axil, leaf blade broadly ovate to broadly suborbicular, 4-6.7 × 4-8 mm, glabrous, base broadly cuneate or oblique to subtruncate, margin obscurely 4-8-crenate. Flowers ca. 3.4 mm in diam. Sepals spreading, broadly elliptic, 0.9-1.3 × 1-1.3 mm, brown papillose at sinus, apex obtuse or acute. Stamens 8; filaments ca. 0.5 mm. Ovary subinferior; styles ca. 0.4 mm. Disc distinctly 8-lobed, surrounded by sparse, brown papillae. Capsule subtruncate and retuse at apex; carpels horizontal, subequal; rostrums ca. 0.4 mm. Seeds black, narrowly subvoid, ca. 1 mm, smooth, glabrous. Fl. and fr. May-Aug. 2n = 12, 24.
Wet places in forest understories; 900-1000 m. Heilongjiang, Jilin, ?Liaoning [Japan, Russia].