Japan Flora: More delicate; stems 5-12 cm. long; flowers 4-5 mm. long including the capsule; peri an th-segmen ts lanceolate, rather acute, the outer slightly longer than the inner; stamens as long as or slightly longer than the perianth, the filaments slightly shorter than the perianth; capsule slightly longer than the perianth, oblong.
Hokkaido, Honshu (Mount Yatsugatake in Shinano); rare. n. Korea and China.