Ohwi 1985 Flora of Japan

the leaflets nearly all alike, on pctiolules 5-10 mm. long, rather thinly membranous, ovate-elliptic or oblong, 5-8 cm. long, 2-3-5 cm. wide, caudately long-acuminate, cuneate at base, coarsely acute-serrate on upper half, tliinly white ap- pressed-puberulent especially on the nerves beneath, and with axillary tufts of white hairs, the lateral nerves 10-12 pairs; inflorescence racemose, pendulous, loosely white-pubescent, the racemes 4-15 cm. long, on peduncles 2-4 cm. long, the pedicels spreading to ascending, 4-6 mm. long; flowers small, about 5 mm. across, 4-merous; sepals about 1 mm. long; petals about 2.5 mm. long; stamens 4, slightly shorter than the petals, the filaments broadened at base; samaras glabrous or short-puberu- lent while young, nearly erect to  ascending, 2.5-3 cm. long.

Apr.-May.

Mountains; Hokkaido, Honshu, Shikoku, Kyushu