Japan Flora: Shrub; branches glabrous with recurved flat prickles; stipules membranous, entire, slightly glandular on margin, the free portion linear; leaflets 5, subcoriaceous, broadly lanceolate to narrowly ovate-oblong, (3-) 5-10 cm. long, 1-2.5 cm. wide, long-acuminate, glabrous, pale beneath; flowers 5-20, in corymbs or flat-topped panicles, white, 4-5 cm. across, the pedicels 3-5 cm. long, loosely short- glandular-pilose; calyx-tube loosely glandular-pilose, the styles hairy. May-June.

Honshu (s. part of centr. distr. and western Kinki Distr.), Shikoku, Kyushu; rare.