陕甘枫 shan gan feng

Acer cappadocicum Gleditsch f. tricaudatum (Rehder ex Veitch) Rehder; A. cappadocicum var. tricaudatum (Rehder ex Veitch) Rehder; A. cappadocicum subsp. trilobum A. E. Murray, p.p.; A. fulvescens Rehder subsp. fupingense (W. P. Fang & W. K. Hu) W. P. Fang & W. K. Hu; A. fulvescens var. fupingense W. P. Fang & W. K. Hu; A. fulvescens subsp. fuscescens W. P. Fang; A. laetum C. A. Meyer var. tricaudatum Rehder ex Veitch; A. tricaudatum W. P. Fang & C. C. Fu.

Trees to 10 m tall, andromonoecious. Bark brown or grayish brown. Branchlets reddish green, glabrous; winter buds subglobose, outside glabrous. Leaves deciduous; petiole 7-12 cm, slender, pubescent or glabrescent; leaf blade abaxially pale green, adaxially dark green, 5-10 × 4-12 cm, papery, abaxially pubescent or glabrous, adaxially glabrous, primary veins (3-)5, reticulate veins conspicuous abaxially, usually 3- or 5-lobed; lobes basally truncate, margin entire, apex acute or caudate-acute. Inflorescence terminal, corymbose. Flowers yellow- green. Sepals 5, obovate, 2-2.5 mm. Petals 5, oblong-obovate, ca. 5 mm. Stamens 6-8. Disk nearly glabrous. Samara oblong, 1.2-3 cm including wings; nutlets convex, usually impressed on other side of one nutlet; wings 0.4-1 cm wide, spreading with acute to obtuse angle. Fl. Apr-May, fr. Jul-Sep.

● Forests along streams, mixed forests, valleys; 700-3000 m. SE Gansu, W Hubei, S Shaanxi, N and NW Sichuan.