16. Acer duplicatoserratum Hayata, J. Coll. Sci. Imp. Univ. Tokyo. 30(1): 65. 1911.
重齿枫 chong chi feng
Trees small. Young branchlets glabrous or white villous-pubescent, glabrescent, glabrous when mature. Petiole glabrous or pubescent, geniculate at base, 1.5-5 cm; leaf blade orbicular, lanceolate-oblong, or subcordate, 2.3-10 × 3-10 cm, palmately 7- or 9-lobed, lobes lanceolate or lanceolate-oblong, both surfaces villous especially on veins, base cordate, margin sharply and doubly serrate, apex acuminate. Inflorescence corymbose, densely villous at first; peduncles 1-2.5 cm. Flowers small; pedicel 5-6 mm. Staminate flowers ca. 6 mm in diam. Sepals 5, slightly purplish, ovate-oblong or lanceolate, 2-3 mm, ± glabrous. Petals 4, white, orbicular-ovate, 1-1.5 mm. Disk into 4 glands. Ovary densely villous in pistillate flowers. Stamens short; anthers and filaments each ca. 1 mm. Nutlets strongly convex, 5-7 mm in diam., including wing 2-3 cm; wings spreading at obtuse angle. Fl. Apr or May, fr. Sep.
● Deciduous forests; 200-2000 m. Anhui, Fujian, Guizhou, S Henan, Hubei, Hunan, Jiangsu, Jiangxi, Shandong, Taiwan, Zhejiang.
After publication of the family treatment for the Flora of China, Chin-Sung Chang & Kwang-Bok Woo provided a new taxonomic treatment for this complex (J. Jap. Bot. 86: 219-223. 2011).
