假色槭

Shrubs or small trees, to 8 m tall, andromonoecious. Branchlets slender; winter buds large, scales 6, ovate, outside densely pilose. Leaves deciduous; petiole 3.5-4 cm, slender, densely pubescent when young; leaf blade abaxially light green, adaxially dark green, suborbicular, 6-8(-10) cm in diam., papery, abaxially densely white pubescent, base deeply cordate to cordate, usually 9-, 11-, or 13-lobed, sinuses 1/2-2/3 width of leaf; lobes triangular-ovate or ovate-lanceolate, margin doubly serrate, teeth incised, apex acuminate. Inflorescence terminal, corymbose, 3-4 cm wide, pubescent; peduncles 2-3 cm. Pedicel 8-10 mm. Sepals 5, lanceolate, pubescent along margin. Petals 5, white or yellowish white, obovate, ca. 4 × 3 mm. Stamens 8, ca. 4 mm. Disk glabrous. Ovary slightly pilose, nearly glabrous; stigmas ca. 1 mm. Fruit purplish yellow; nutlets convex, 5-7 × 4-5 mm, glabrous, strongly veined; wing narrowly obovate, contracted at base, including nutlet 1.5-2.5 cm × 5-6 mm, wings spreading obtusely or nearly horizontally. Fl. May-Jun, fr. Sep. 2n = 26.

Heilongjiang, SE Jilin, E Liaoning [Korea, E Russia].

Forests; 700-900 m.

Acer circumlobatum Maximowicz var. pseudosieboldianum Pax, Bot. Jahrb. Syst. 7: 200. 1886; A. pseudosieboldianum var. koreanum Nakai; A. sieboldianum Miquel var. mandshuricum Maximowicz.