生活型

herb

形態特徵

• Annual herb, erect, 70–80 cm tall. Stems simple or more often branched, terete, densely velutinous with silky hairs or glandular trichomes; branches sometimes ascending.
• Leaves elliptic to oblong, sessile or petiolate, 10–12×3.5–4.5 cm, apex obtuse, base attenuate, margins doubly serrate or sometimes slightly variously lyrately lobed, tomentose on upper surface, woolly on lower surface, veins 5–8 pairs.
• Heads 7–8 mm long, 2.5–3.5 mm across, in axillary and terminal dense to lax panicles. Involucres campanulate bracts in 2 or 3 series, outer ones shorter, linear-lanceolate, 1.5–2.5×0.2–0.3 mm, densely velutinous with multicellular and glandular hairs; inner ones linear, 4–5 mm long, 0.2–0.3 mm wide, margins ciliate. Receptacle convex, alveolate, glabrous. Central florets yellowish, 6–7 mm long, with 5 triangular lobes, lobes with sessile glands and multicellular hairs. Outer florets 5 mm long, 2–5 lobed, limb glandular.
• Achenes oblong, sparsely hirsute. Pappus white, 4 mm long.
• Chromosome number, 2n = 36 (Peng & Hsu, 1978).

分布

• 台灣 : in wastelands at lower elevation, common.
• 世界 : Southeastern Africa, southeastern Asia and northern Australia.

引證標本

TAIPEI: Pitou, Peng 2130; Chihshanyen, Simada s. n. 1909. ILAN: Wuchihfeng, Kao 3272. TAOYUAN: Sanchiaoyung, Sasaki s. n. 1910. HSINCHU: Shimada s. n. 1909. MIAOLI: Tunglo, Peng 13965; Tunghsiao, Peng 11564. NANTOU: Hsitou, Hsu & Kuo 13515. TAINAN: Nanhua, Peng 10544; Chiali, Sen s. n. 1942. KAOHSIUNG: Chihshan, Chung 1304; Liukuei, Kao 10458. PINGTUNG: Manchou, Leu 1657; Paolilinchang, Yang 996. TAITUNG: Lanyu Is., Leu 1374. HUALIEN: Fengpin, Leu 1476; Taroko, Peng 2661.

引用文獻

• PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 878. 1998.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)