生活型

herb

形態特徵

• Stems 35–90 cm tall, dichotomously branched, patently strigose.
• Leaves scattered along stem, lower ones oblong-obovate, 10–22×3–7 cm, apex acute, base gradually dilated, margins serrate or subentire, strigose, lower surface densely soft puberulent, sparsely appressed-pubescent toward mucronate apex; upper leaves gradually smaller, elliptic or elliptic-oblong.
• Heads in clusters surrounded by cordate leafy bracts, bracts 3, acuminate, 8–15×7–12 mm, subentire, strigose. Involucre oblong, 6–8×3 mm, bracts strigose, outer 4 lanceolate-oblong, 4–5 mm long; inner 4 elliptic-oblong, 7–8 mm long. Florets 4 per head; corolla 5 mm long, lobes obtuse.
• Achenes 2.5–3 mm long; pappus bristles 5, stiff, dilated and hairy at base, 3.5–4 mm long.
• Chromosome number, 2n = 22 (Peng & Hsu, 1978).

分布

• 台灣 : widespread at low elevations throughout the island.
• 世界 : Tropical America, introduced into tropical Asia.

引證標本

TAIPEI: Peichatienshan, Peng 7449; Waishuanghsi, Chen 41. TAOYUAN: Fuhsing, Wang 1955; Hsiayun, Peng 10307. HSINCHU: Lienhuassu, Peng 5142; Wuchihshan, Peng 12912. TAICHUNG: Kukuan, Peng 8724. NANTOU: Hoshe, Peng 11374; Lienhuachih, Lin 232. CHIAYI: Fanlu, Peng 10044; Tienyunshan, Peng 8792. PINGTUNG: Wutai, Lin 313; Shouka, Chen 890. TAITUNG: Lanyu Is., Peng 7661; Taiyuanhsiaku, Chen 448.

參考文獻

• PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 938. 1998.  (Fl. Taiwan 2nd edit.)