生活型

tree

形態特徵

• Trees to 10 m tall; trunk with striate ridged bark. Branches yellowish to dark brown; branchlets more or less pilose becoming glabrate; buds flat, beaked, glabrous, yellowish brown; bud-bract margins overlapping.
• Leaf blades lanceolate to broadly so, 7-11(-20) cm long, 2-3.5(-4) cm wide, apex acute to acuminate, base acute to obtuse, margins glandular-serrulate; immature leaf blades reddish to yellowish green, sparsely pilose with hairs on both surfaces; mature leaf blades glabrate, lower surfaces glaucous, lateral veins 15-30 pairs including those not reaching margins; petioles 5-10 mm long, pilose or glabrate, with glandular processes (sometimes leaf-like) at distal end; stipules ovate to reniform, 0.5-10 mm long, margins glandular-dentate, persistant or deciduous.
• Aments coetaneous, borne on leafy flowering branchlets, 1-4 cm long. Staminate aments 3-8 cm long, flowers loosely whorled; stamens (3-)4-7(-8), fused with bract at base, sometimes up to half as long as bract, filaments pilose near base, 3-4 mm long, anthers globose to broadly ellipsoid; nectaries 4-5, sometimes fused at base, largest one adaxial, others abaxial; bracts subovate, base narrow, margins and adaxial surface pilose, abaxial surface glabrous. Pistillate aments 4-7 cm long, flowers loosely whorled; pistils greenish, glabrous, fusiform-ovate, style short or absent, stigma double bifid, to 0.3 mm long, stipules elongate, 0.5-3 mm long; nectary 1, square, adaxial, partly surrounding stipe; bracts as in staminate flowers, shorter than stipule in fruit; ovules 6-10 per ovary.
• CapsuleS ovate, long stipitate.Seeds green, clavate, 1-2 mm long, with coma at base.

分布

• 台灣 : Riparian plant of lowlands throughout the island.

引證標本

TAIPEI: Aoti, Huang 3518*; NTU campus, Yang 3299*. ILAN: Shuanglienpei, Yang 3328. TAOYUAN: Chungli, Yang s. n. 1986. HSINCHU: Shuikun, Yang 2744*. MIAOLI: Kungkuan, Yang s. n. 1984. TAICHUNG: Wufeng, Yang s. n. 1971. NANTOU: Sun Moon Lake, Yang 2722. TAINAN: Hsinhua, Chang 23. KAOHSIUNG: Chishan, Sasaki s. n. 1917. TAITUNG: Kuanshanchen, Yang 3111*. HUALIEN: Hsieh & Tang s. n. 1988.

引用文獻

• YANG, KUOH-CHENG and HUANG, TSENG-CHIENG, Flora of Taiwan, second edition 2: 41. 1996.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)