Acer amoenum Hu & W. C. Cheng, Bull. Fan Mem. Inst. Biol., n.s., 1: 200. 1948, not Carrière (1867).

Trees to 12 m tall, andromonoecious. Bark brown, rough. Branchlets glabrous; lenticels elliptic. Leaves deciduous; petiole 1.8-3.5 cm, glabrous; leaf blade abaxially glaucous, adaxially deep green, oblong or ovate, 4-6 × 1.6-2.8 cm, leathery, primary veins prominent abaxially, conspicuous adaxially, lateral veins from base to central part of blade, base rounded, margin entire or slightly with 2 obtuse lateral lobes, apex acute. Inflorescence terminal, corymbose, densely pubescent; peduncles 4-6 mm. Flowers green. Sepals 5, green, lanceolate, rarely oblong, 3.5-4.3 mm, glabrous. Petals 4, light green, ca. as long as sepals. Stamens 8. Disk glabrous, extrastaminal. Ovary hairy. Samara 2-2.2 cm; nutlets strongly convex, ca. 6 × 4 mm; wings ca. 7 mm wide, spreading at obtuse angle. Fl. Apr, fr. Aug.

● Broad-leaved forests; 700-1100 m. SE Yunnan.