三花枫 san hua feng

Acer triflorum f. subcoriaceum (Komarov) S. L. Tung; A. triflorum var. subcoriaceum Komarov; Crula triflora (Komarov) Nieuwland.

Trees to 25 m tall, androdioecious, sometimes andromonoecious. Bark yellow-brown, vertically fissured, peeling in small scales. Branchlets slender, sparsely pilose, soon glabrous or nearly glabrous; winter buds small, scales ciliate. Leaves deciduous; petiole purplish, 2.5-6 cm, sparsely pilose or glabrous; leaf blade membranous, papery, or subleathery, abaxially glabrescent, with densely pilose midvein, adaxially pilose, soon glabrous, 3-foliolate per petiole; petiolule 5-10 mm, slender, sparsely pilose; leaflet blades oblong-ovate to obovate-lanceolate, 4-9 × 2-3.5 cm, margin entire or remotely serrate with a few coarse teeth; middle leaflets cuneate apically; lateral veins 11-13 pairs, adaxially conspicuous. Inflorescence corymbose, 3-flowered. Sepals 5. Petals 5. Stamens 10. Ovary pubescent. Fruit greenish yellow; nutlets subglobose, 1.4-1.6 × 1-1.2 cm, densely pubescent; wing including nutlet 3.5-4.5 × 1.3-2 cm, subparallel, wings spreading at 90° or erectly. Fl. Apr, fr. Sep.

Mixed forests; 400-1700 m. Heilongjiang, Jilin, Liaoning [Korea].