Japan Flora: Much-branched, nearly glabrous scandent herb, puberulent while very young; leaves thick- membranous, broadly ovate, 5-10 cm. long, 4-8 cm. wide, shordy acuminate to abruptly acute, deeply cordate, the peti­ole shorter than the blade; flowers umbellate, the peduncles as long as to shorter than the petioles, 1-4 cm. long, the pedi­cels 5-8 mm. long; flowers pale yellow-green; calyx-lobes broadly lanceolate, acute; corolla-lobes broadly ovate, about 3 mm. long, rather thick, obliquely spreading, incurved on margin, puberulent inside; follicles lanceolate, about 8 cm. long, about 1 cm. wide. July-Aug. Grassy hillsides.

Hon­shu, Shikoku, Kyushu. Korea and Manchuria.