生活型

tree

形態特徵

• Small trees; young branchlets slender, white-villose-pubescent, becoming glabrescent and glabrous.
• Leaves deeply 7-lobed, lobes lance-oblong, acuminate, cordate and 7-nerved at base, subcordate in outline, 2.3–5.5 cm long, 3–8 cm broad, subduplicately serrate, villose especialy on the veins on both surfaces; petioles glabrous, slender, kneed at base, 1.5–3.5 cm long.
• Inflorescence of small corymbs, densely villose-pubescent at first; the peduncle 1- 2.5 cm long; pedicels 5–6 mm long; flowers small; sepals 4, oppositely 2-formed, ovate-oblong or lanceolate, 2–3 mm long, 1-0.5 mm broad, more or less glabrous, slightly purplish; petals 4, roundish-ovate, 1–1.5 mm long, white; disk into 4 glands, distinct; stamens 4, around and alternate to glands. Pistillate flowers; ovary densely villose. Staminate flowers 6 mm across; stamens short; anthers and filaments each ca. 1 mm long.
• Each semicarp of samara with the wing ca. 2.5 cm long; lower edges of two wings spreading at angles of 120–130 degree.

分布

• 台灣 : Scattered in forest at medium latitudes of central to northern parts of Taiwan.

引證標本

TAOYUAN: Tamanshan, Yang 1273. HUALIEN: Tayuling-Tsuen, Tang 84*.

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)