生活型

tree

形態特徵

• Deciduous trees, 10–20 m high; branches glabrous.
• Leaves chartaceous, shallowly 5-lobed, the middle lobe shortly ovate, acuminate at apex, the lateral lobes smaller, acute to obtuse at apex, truncate or subcordate and 5-nerved at base, roundish-ovate in outline, 5–13 cm long, 4–11 cm broad, doubly serrate, green above, glabrous beneath; petioles 3–8.5 cm long.
• Flowers in racemes; the peduncle to 6 cm long; pedicels short; sepals 5, elliptic, hirsute at margins; petals 5, oblong-triangular, wavy at margins; disk into glands 8; stamens 8, around and alternate to glands. Pistillate flowers 5 mm across; staminodes short, 1 mm long; anther-apex acuminate; ovary roundish in facial view, pubescent; styles 2, long, recurved toward the base.
• Samara yellowish brown; each semicarp with the wing 1.8–2 cm long; lower edges of two wings divaricate at angles of (90-)115–135 degree.

分布

• 台灣 : In forests at medium altitudes of 1,800–2,300 m, central ranges.

引證標本

MIAOLI: Chungshueshan, Yang 397. TAICHUNG: Anmashan, Yang 452*; Nanhuchi, Wang et al. 3856. NANTOU: Tongpu, Chen 3514. CHIAYI: Alishan, Murata & Huang 17599. KAOHSIUNG: Mt. Stone, Huang 6552. HUALIEN: Tayuling, Tang 82.

引用文獻

• LI, HUI-LIN and LO, HANN-CHUNG, Flora of Taiwan, second edition 3: 594. 1993.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)