生活型

herb

形態特徵

• Erect herbs, branching; stems terete, sparsely pilose or glabrous, to 1 m tall.
• Leaves sessile, sparingly pilose, lower and basal ones obovate-spatulate, 8–14 cm long, apex obtuse, margins crenate or entire, upper leaves much smaller, linear to linear-lanceolate, acute, entire.
• Heads usually oblong, ca. 1.4 cm long, solitary or in clusters of 2–5 arranged spicately on elongated inflorescence branches. Involucre 8–12 mm long, bracts green, lanceolate, aristate-acuminate, outer bracts smaller, ca. 1/2 as long as inner. Corolla white, ca. 7 mm long. Receptacles minute.
• Achenes brown, oblong, 1–1.2 cm long, 5–6 mm wide, strongly 10-ribbed, hirsute. Pappus bristles 10, 4 rigid, unequal, 4 straight and 2 longer and curved.
• Chromosome number, 2n = 22 (Peng & Hsu, 1978).

分布

• 台灣 : at low elevations in open fields in the south.
• 世界 : South America, introduced and naturalized in Asia.

引證標本

NANTOU: Hoshe, Peng 6566. CHIAYI: Fanlu, Yen 2069. KAOHSIUNG: Liukuei, Peng 11210, Shanping, Peng 11247. PINGTUNG: Nanjenshan, Liu 80.

參考文獻

• PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 1041. 1998.  (Fl. Taiwan 2nd edit.)