Japan Flora: Tree, glabrous except the branches and leaves which are rusty-brown crisped-pubescent while young; leaves thick-chartaceous, ovate to broadly so, 3-angled, undivided or shallowly 3-fid and 5- angled, 8-13 cm. long, 4-6(-10) cm. wide, long-acuminate, cordate or rounded at base, irregularly and acutely serrulate, often glaucescent beneath, the lateral lobes if present small, the petioles 3-5 cm. long; inflorescence racemose, densely manyflowered, about 10 cm. long, on short peduncles, the pedicels 4- 8 mm. long, ascending; flowers pale green, 7-8 mm. across; sepals 5, narrowly oblong, 3-4 mm. long; petals and stamens equaling the sepals; samaras glabrous, nearly horizontally spreading, about 15 mm. long. May-June. Mountains;

Honshu (Kanto Distr. and westw.), Shikoku, Kyushu.