生活型

tree

形態特徵

• Evergreen trees; trunks straight, to 20 m high, 0.6 m across; bark blackish; young branchlets glabrous.
• Leaves alternate, lanceolate, oblong-lanceolate to broadly ovate-oblong, 6–12 cm long, 2.5–5 cm wide, long-acute at apex, acute, obtuse to rounded at base, serrate from middle to apex, chartaceous, glabrous, green and lustrous above, grayish-white, but not waxy beneath brownish-violet to green when young, petiolate, lateral veins 11–15 pairs. Staminate catkins 6–9 cm long, axillary, pendulous;
• Staminate flowers numerous, yellowish-brown; perianth 4–5-parted; stamens 4–5. Pistillate flowers 2–3 in erect spikes, axillary, enclosed in an involucre; perianth 4–5-cleft; styles 3.
• Cupules cup-like, scales in 6–8 concentric rings;nuts broadly ellipsoid, 1.5 cm long, 1.1 cm across.

物候

Staminate flowers blooming in April; fruits maturing from October.

分布

• 台灣 : only at Sanhsingishan, Aoti, Ilan.
• 世界 : Distributed in Japan, Korea, Laos, N Thailand, Vietnam and China (SE, S, SW & C).

引證標本

ILAN: Sanyuishan, Nakamura 036981.

參考文獻

• LIAO, JIH-CHING, Flora of Taiwan, second edition 2: 78. 1996.  (Fl. Taiwan 2nd edit.)