Japan Flora: Pubes­cent perennial; stems soon creeping, leafy; leaves opposite, ovate or broadly so, 1-2.5(-3) cm. long, 7-20 mm. wide, with pellucid dots, acute, entire, rounded at base, the petioles 5-10 mm. long; flowers solitary, axillary, yellow, 5-7 mm. across, erect in anthesis, soon deflexed, the pedicels 3-8 (-12) mm. long; calyx-segments linear-lanceolate, acuminate, as long as the corolla or slightly accrescent after anthesis; corolla-lobes ovate-deltoid, 5-7 mm. long; capsules globose, 4-5 mm. across, long-pubescent at tip; seeds black, ellipsoidal, 1-ridged, densely warty, about 1 mm. long. May-Junc. Thickets and road­ sides in lowlands and mountains.

Hokkaido, Honshu, Shi­koku, Kyushu. common. Ryukyus, Formosa, China, and Malaysia