形态特征：Perennial herb, up to 25 cm tall; stems pubescent, lower part procumbent, rooting at nodes, upper part ascending. Petiole 0.4–1.2 cm long, pubescent, often purple; leaf blade drying papery, elliptic or ovate-elliptic, 1.2–5.5 × 0.5–2.2 cm, acute at apex, cuneate at base, adaxially green, abaxially pale green, both surfaces pubescent, margin entire, ciliate; secondary veins in 7–12 pairs, abaxially purple; stipules triangular, 0.5–1.0 mm long, pubescent. Inflorescence cymose, several to 15-flowered; peduncles 2.5–7.5 cm long, puberulent; bracts subulate, 0.5–2.5 mm long, puberulent; pedicels 0.2–1 mm long, puberulent. Flowers distylous. Calyx puberulent; hypanthium portion obconic, 1.0–1.5 mm long; lobes triangular, 0.3–0.8 mm long, acute at apex. Corolla white, tubular, glabrous outside; tube 4–5 mm long, sometimes slightly enlarged at base of long-styled corolla; lobes triangular-ovate, 1.8–2.2 × ca. 1 mm. Stamens 5; anthers linear. Stigma bilobed; ovary 2-celled. Long-styled flowers: corolla tube inside with densely pubescence above anthers and pilosulous at throat and sometimes onto lobes; anthers inserted at the middle of corolla tube, ca. 1 mm long; style 1.5–1.6 mm long, glabrous; stigma slightly above the throat, 2-lobed, lobes elliptic, ca. 0.5 mm long. Short-styled flowers: corolla tube inside pubescent through middle to throat and pilosulous at base of lobes; anthers slightly above the throat, ca. 0.8 mm long; style 2.5–3.5 mm long, glabrous; stigma at middle of corolla tube, lobes lanceolate, ca. 1.0 mm long. Capsules subglobose, 1.5–2.2 mm in diam., valves 4 when mature. Seeds many, angular.
