Acer caudatifolium Hayata

Trees to 20 m tall, andromonoecious. Branchlets slender, glabrous; winter buds ellipsoid; scales glabrous. Leaves deciduous; petiole 3-4 cm, glabrous; leaf blade abaxially pale green, adaxially dark green, ovate or ovate-oblong, (5-)6-10(-11) × 3-4.5 cm, papery, adaxially glabrous, 5-veined at base, base rounded, margin densely serrulate with sharp appressed teeth, apex caudate-acuminate. Inflorescence racemose-umbellate, ca. 15-flowered. Pedicel 6-7 mm. Sepals 5, purple, oblong, 2-2.5 mm, apex obtuse. Petals 5, white. Stamens 8, shorter than sepals. Disk glabrous, slightly lobed, intrastaminal. Ovary purple, glabrous; style very short; stigmas revolute. Fruit yellowish brown; nutlets convex, ca. 5 mm in diam.; wings introrsely sulcate, 2-2.2 × ca. 1.2 cm, wings spreading obtusely. Fl. Mar, fr. Jul-Aug.

Taiwan.

● Mixed forests; 200-2100 m.

Acer kawakamii Koidzumi; A. kawakamii var. taiton-montanum (Hayata) Li; A. pectinatum Wallich ex G. Nicholson subsp. formosanum A. E. Murray; A. taiton-montanum Hayata.