2. Acer chunii W. P. Fang, Sunyatsenia. 3: 263. 1937.
乳源枫 ru yuan feng
Trees ca. 7 m tall, glabrous. Bark dark brown. Branchlets dull brown, slender, minutely lenticellate. Leaves deciduous, long petiolate; petiole 3-7 cm, very slender; leaf blade abaxially pale green, adaxially bright green, drying brownish green, ovate, variable in size, larger ones 7-9 × 4-5 cm, smaller ones not exceeding 4 × 2.5 cm, papery, 3 principal veins slender, slightly prominent abaxially, obscure adaxially, lateral veins 3 or 4, slender, densely minutely reticulate on both surfaces, base rounded, margin entire and unlobed or 3-lobed, apex abruptly long acuminate with a long slender caudate-falcate acumen minutely aristate; 3-lobed leaf blade 10-11 × 7-8 cm; lateral lobes equal or unequal, very short to nearly obsolete, or obtuse to acute, or ovate-triangular and distinctly long caudate-acuminate. Flowers unknown. Inflorescence corymbose, few branched, apparently nodding, to 6 cm and ca. as broad, sessile or subsessile; peduncle when present not exceeding 3 mm. Samara reddish purple when immature; pedicels 2-3 cm, slender; wing subhorizontal, straight, obtuse, including nutlet 2-3 cm × 5-8 mm. Nutlets flattened, ovoid-oblong, ca. 10 × 6 mm, not reticulate. Fl. Apr, fr. Sep.
● Sparse forests; 800-2500 m. Fujian, N Guangdong, SW Sichuan.
This is a rare species.