Japan Flora: Stems long-creeping, often rooting at the nodes, pubescent with soft-spreading long hairs; leaves ovate-cordate, 7니3 mm. long, 6-10 mm. wide, acutish, rounded to slightly cordate at base, pubescent, petioled; pedicels axillary, slender, solitary, 15-30 cm. long; calyx-segments obovate-spathulate, 3-4 mm. long; short-acuminate; corolla about 1 cm. wide, yellow, glandular-striate; anthers oblong, about 1.2 mm. long.