Japan Flora: Thinly yellowish pubescent or nearly glabrous; steins very slender, creeping, matted; leaves loosely arranged, reniform- to orbicular-cordate, 5-10 mm. long, 8-20 mm. wide, rounded to retuse, deeply cordate, the petioles slen­der, 1-4 cm. long; flowers sessile or on short delicate peduncles shorter than the petioles, yellow, about 3 mm. across; calyx­segments or sepals obovate-oblong; corolla-lobes oblong, slightly longer than the calyx; lobes of capsules globose, about as long as the calyx, loosely long-hairy. Apr.-Aug. Around dwellings and along roadsides in lowlands.

Honshu (warmer parts of w. distr.), Shikoku, Kyushu. s. Korea, Ryukyus, Formosa, and the Tropics generally.