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A deciduous tree 40 ft, perhaps more, high, with glabrous branchlets. Leaves 2 to 4 in. across, 2 to 3 in. long; bright green, and glabrous above except for a tuft of hairs at the base, hairy along the veins beneath; there are always three large triangular lobes, and these are usually supplemented by two small ones at the base; the margins irregularly toothed. Flowers greenish yellow, produced in May on hairy-stalked corymbs, 11⁄2 to 3 in. long.
A maple of unknown origin, but related to A. × coriaceum, from which it differs in having down along the veins beneath. It is no doubt a hybrid between A. pseudoplatanus and one of the Opalus group.