Acer tonkinense Lecomte

Trees to 12 m tall, andromonoecious. Bark dark brown, smooth. Branchlets white waxy, glabrous, those of present year purplish green, older ones purple-brown or dark purple. Leaves deciduous; petiole purplish green, glabrous, 2-3.5 cm; leaf blade elliptic, suborbicular, or oblong, (8-)10-17 × 7-15 cm, subleathery, abaxially glabrous except for axillary tufts of hairs, adaxially glabrous, primary veins 3, lateral veins 7-10 pairs, base nearly rounded or subcordate, deeply or shallowly 3-lobed or 3-dentate, sinuses to 1/3 width of blade; lobes triangular, margin entire, apex acute. Inflorescence terminal, paniculate, 8-10 cm, many flowered. Sepals 5, purplish green, triangular. Petals 5, yellowish. Stamens 8. Disk extrastaminal, pubescent. Ovary densely pubigerous. Fruit yellowish; nutlets convex, nearly rounded, ca. 8 × 6 mm; wing falcate, including nutlet 1.8-3.5 cm, wings spreading ± horizontally. Fl. Apr-May, fr. Sep.

Guangxi, S Guizhou, SE Xizang, SE Yunnan [Myanmar, Thailand, N Vietnam].

Mixed forests; 300-1800 m.

Acer kwangsiense W. P. Fang & M. Y. Fang; A. liquidambarifolium Hu & W. C. Cheng; A. tonkinense subsp. kwangsiense (W. P. Fang & M. Y. Fang) W. P. Fang; A. tonkinense subsp. liquidambarifolium (Hu & W. C. Cheng) W. P. Fang.

Acer tonkinense is an Asian species of maple. It has been found southwestern China (Guangxi, Guizhou, Tibet, Yunnan) and northern Indochina (Vietnam, Thailand, Myanmar).

Acer tonkinense is a deciduous tree up to 12 meters tall with smooth brown bark. Leaves are non-compound, up to 17 cm wide and 15 cm across, thick, usually with 3 lobes.

Subspecies Acer tonkinense subsp. liquidambarifolium (Hu & W.C.Cheng) W.P.Fang Acer tonkinense subsp. tonkinense