五小叶枫 wu xiao ye feng

Trees to 10 m tall, andromonoecious. Branchlets brown, widely spreading or slightly pendulous; buds imbricate, purplish. Leaves deciduous; petiole brownish yellow, 6-8 cm, glabrous; leaf blade subleathery, abaxially white glaucous, adaxially dark green and glabrous; leaflets (4 or)5(-7); petiolules 5-8 mm, glabrous; leaflet blades 5-8 × 1.5-2 cm, narrowly lanceolate or lanceolate, midvein prominent abaxially, slightly impressed adaxially, veins slightly raised abaxially, base cuneate or broadly cuneate, apex ± obtuse or ± obtuse-acuminate. Inflorescence corymbose, glabrous. Pedicel 1-2 cm, slender, glabrous. Petals 5. Stamens 8; filaments glabrous. Disk glabrous, extrastaminal. Ovary sparsely pubescent. Nutlets ca. 5 mm in diam., strongly convex, puberulent; wing including nutlet 2.3-2.5 cm × ca. 8 mm, wings spreading at 90°. Fl. Apr, fr. Sep.

● Mixed forests, valleys; 2300-2900 m. SW Sichuan.

This is a very rare, endangered species.