Japan Flora: Stems erect, 3-15 cm. long, sparsely pubescent while young, nearly glabrous later; stolons with a small resting bulbil at the tip from which the new plant arises each year; leaves all cauline, 2 to 3 pairs, ovate- orbicular, 4-18 mm. long, 5-15 mm. wide, short-toothed, petiolate; flowers yellow-green; calyx-lobes erect, ovate-orbicu­lar, about 1 mm. long; stamens 8, to 1 mm. long, shorter than the calyx-lobes, the disc indistinct; capsule-valves sub­erect, unequal, slightly compressed laterally; seeds ovoid-glo­bose, about 0.6 mm. long, mairunillate on the longitudinal ribs. Mar.-Apr. Wet places.

Honshu (Sagami, Awa, Izu, Shimotsuke Prov.); rare.