羽扇枫 yu shan feng

Trees small, 8-10 m tall, andromonoecious. Bark grayish white or grayish brown. Branchlets green or purplish green, glabrous; winter buds ellipsoid, scales 5 pairs, nearly rounded, glabrous. Leaves deciduous; petiole 3-5 cm, pubescent when young; leaf blade abaxially pale green, adaxially dark green or yellowish green, suborbicular, 9-12 cm in diam., papery or membranous, base deeply cordate, 9- or 11-lobed; lobes ovate, margin incised-serrate, teeth ± acute or sharp, incised to less than 1/2 width of leaf, apex acuminate. Inflorescence terminal, corymbose, 10-15-flowered, 3-5 cm; peduncles 3-5 cm. Pedicel 1-2 cm, pubescent. Sepals 5, ovate or obovate, ca. 6 × 4 mm, apex obtuse. Petals 5, purple, elliptic, ca. 5 mm, emarginate, apex obtuse. Stamens 8, ca. 7 mm, glabrous. Disk glabrous, slightly lobed, extrastaminal. Ovary densely villous; style glabrous; stigmas short. Fruit yellowish green; nutlets convex, densely villous, veined; wing incurved, leaflike, including nutlet 2-2.8 × ca. 1 cm, wings spreading at 90°-160°. Fl. May, fr. Sep. 2n = 26.

Cultivated. Jiangsu, Liaoning [native to Japan].