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Tree to 30 (–35) m high, deciduous, monoecious, wide-crowned. Bark scaly. Leaves simple, c. 15–30 cm long; lamina palmately 3–5-lobed, 7–22 cm long, 8–22 cm wide, cordate at base, often glaucescent and/or reddish beneath, 3–5-veined, with scattered short hairs beneath, particularly near the veins; lobes usually divided c. midway to petiole, ovate to ovate-oblong, acute to acuminate, coarsely and irregularly toothed/serrate; petiole 3–15 (–26) cm long, often red. Inflorescence a terminal, elongate, pendulous raceme or racemose panicle to 20 cm long; flowers 60–100, greenish yellow, andromonoecious. Sepals 5, ovate, c. 3 mm long. Petals 5, narrowly ovate, c. 4 mm long, pale green. Stamens 8–10, hypogynous, inserted within disc. Ovary tomentose. Samaras ascending, 3.5–5.5 cm long; wings divaricate, strongly veined, c. 2.5 cm long.
Tall tree with rough-looking, coarsely crenate and 5-lobed lvs, the lobes and teeth never sharply acuminate; fls yellowish-green, numerous in slender drooping panicles 6–15 cm; sep and pet subequal, 4–5 mm; disk extrastaminal; style deeply cleft; mericarps 3–4 cm, somewhat distended over the seed but not reticulate, the wings diverging at an angle of 60–90°; 2n=52. Native of Europe and w. Asia, occasionally escaped from cult. May.
