Description from Flora of China
Perennials. Stems slender, creeping and rooting at least below middle, 10-15 cm, ca. 0.5 mm in diam., villous with multicellular hairs. Leaves more than 6 pairs, evenly or almost evenly distributed on stem; petiole 2-3 mm, upper leaves sessile; leaf blade ovate-orbicular to oblong, 1-1.5 cm X 6-9 mm, lower ones smaller, glabrous, base rounded, margin crenate, apex obtuse. Racemes usually 2, axillary from upper and uppermost leaves, several flowered, lax, 3-12 cm, axis and pedicels densely with multicellular glandular hairs; peduncle 3-6.5 cm; bracts linear to linear-elliptic, 2-4 mm, glabrous. Pedicel straight, 6-7 mm. Calyx glabrous, 4-lobed; lobes elliptic to linear-elliptic, 2.5-3 X ca. 1 mm, subequal. Corolla rotate, 7-8 mm in diam.; tube less than 0.5 mm; lower lobe oblong, other 3 lobes oblong-orbicular. Ovary and young fruit strongly compressed, ciliate, lateral angles rounded. Style 5-6 mm.
* E Sichuan (Chengkou Xian).