Description from Flora of China
Acer sinense Pax subsp. chingii (Hu) A. E. Murray.
Trees 10-15 m tall, andromonoecious. Bark whitish. Branchlets slender, glabrous. Leaves deciduous; petiole ca. 3 cm, pubescent; leaf blade abaxially light green, adaxially dark green, suborbicular, ca. 10 cm wide, membranous, abaxially glabrous except for pubescent midvein, adaxially glabrous, base cordate or deeply so, 5-lobed; lobes lanceolate, margin entire or sparsely appressed serrate toward apex, apex acuminate; middle lobe ca. 5.5 × 2 cm. Inflorescence corymbose, ca. 5 cm, glabrous. Sepals 5, yellowish green, oblong. Petals 5, white, obovate. Stamens 8. Disk extrastaminal. Fruit yellowish; nutlets convex; wing including nutlet 1.8-2 cm × 5-7 mm, wings spreading acutely. Fl. Apr, fr. Aug.
Acer chingii was originally placed in A. sect. Platanoidea by Hu. It is characterized by its villous petiole; 5-lobed leaf blade, with villous abaxial veins, base deeply cordate, and margin of lobes nearly entire and undulate, only appressed serrate near the apex; corymbose inflorescence; and small samaras.
● Forests; 1200-2000 m. N Guangxi, S Guizhou.