Japan Flora: Short-pubescent perennial; stems decumbent, 15-20 cm. long, branched, slender; leaves ovate to deltoid- ovate, 2-2.5 cm. long, 1-1.5 cm. wide, acute, rounded to truncate at base, appressed-toothed, the petioles 5-10 mm. long; t, sepdcidal; seeds many, rugose, impressed-areolate. flowers solitary in axils, pedicel led; calyx 13-17 mm. long, 5-toothed, 5-winged; corolla about 15 mm. long; capsules about 13 mm. long, short-cylindric.
Kyushu (s. distr.). Ryukyus (Amami-oshima), China.