Japan Flora: Small tree with dark purple-brown or slighdy grayish glabrous branches; leaves cuneately obovate or cuneately obcordate-orbicular, 5-12 cm. long, 4-11 cm. wide, rounded or sometimes slighdy retuse, undulately toothed, pale green beneath, glabrous except the axillary tufts of brownish hairs or thinly pilose on nerves beneath，pale green beneath, broadly cuneate to cuneate at base, the lateral nerves of 6 to 7 pairs, the petioles glabrous, 5-15 mm, long; staminate and pistillate inflorescence each bearing 4 or 5 aments, the fruiting aments ellipsoidal to cylindric-oblong, 15-25 mm. long, 6-8 mm. in diameter.  Mountains

Honshu (n. and centr. distr. along the Japan Sea).