锐角枫 rui jiao feng

Acer acutum var. quinquefidum W. P. Fang & P. L. Chiu; A. acutum var. tientungense W. P. Fang & M. Y. Fang.

Trees to 10 m tall, andromonoecious. Bark brown or brownish gray. Branchlets smooth, glabrous; winter buds brown, ovoid; scales 6, margin ciliate. Leaves deciduous; petiole 4-12 cm, puberulent near apex when young, glabrescent; leaf blade adaxially dark green, ovate or ovate-oblong, 8-15 × 6-12 cm, papery, abaxially pubescent when young, adaxially glabrous, base cordate or subcordate, (5 or)7-lobed; lobes broadly ovate or triangular, middle lobe and lateral lobes usually acuminate apically. Inflorescence terminal, corymbose, puberulent; peduncles 3-5 mm, from leafy branchlets, appearing with development of leaves. Sepals 5, oblong. Petals 5, linear-oblanceolate or obovate. Stamens 8; filaments glabrous. Disk amphistaminal, glabrous. Ovary glabrous; style glabrous; stigmas incurved. Fruit pale brown, glabrous; nutlets compressed, 9-11 × ca. 17 mm; samara wing oblong, parallel-margined, including nutlet 2.5-3.5 cm × 7-11 mm, wings spreading acutely. Fl. Apr, fr. Aug.

● Forests; 800-1100 m. S Anhui, S Henan, Jiangxi, Zhejiang.