Acer sino-oblongum Metcalf

Trees evergreen, to 7 m tall, andromonoecious. Bark brownish gray, rough. Branchlets glabrous, those of present year purple or purplish green, those more than 1 year old brownish purple or grayish purple, lenticels ovate or rounded; winter buds brownish, ovoid, scales slightly ciliate. Petiole 1-3 cm, glabrous; leaf blade abaxially yellowish green and whitish glaucous, adaxially green or pale green, elliptic or elliptic-oblong, 6-9 × 2-4 cm, leathery, veins weak, lateral veins 5-7 pairs, slightly raised below, base broadly cuneate or rounded, margin entire, apex acuminate or caudate-acuminate, adaxially glabrous. Inflorescence terminal, corymbose; peduncle ca. 1 cm. Flowers greenish yellow. Sepals 5, obovate-oblong, ca. 4 mm. Petals 5, oblanceolate, ca. 4 mm. Stamens 8. Disk extrastaminal. Ovary glabrous. Pedicels 5-10 mm, villous. Nutlets strongly convex, ca. 8 × 5 mm; wing including nutlet ca. 3 cm × 10-12 mm, wings spreading at acute angle. Fl. Apr, fr. Sep.

● Evergreen forests, near sea shores. Guangdong.

Acer sino-oblongum, the south China maple, is a species of evergreen maple tree native to China's Guangdong Province and Hong Kong.

Acer sino-oblongum is a short tree up to 7 meters tall. The leaves are elliptical and waxy, unlobed and untoothed unlike the multi-lobed leaves found on most maples. The tree occurs naturally in coastal evergreen forests.