生活型

herb

形態特徵

• Stems branched at base, branches procumbent.
• Lower, median and upper leaves about equal in size, spatulate, 7–20 mm long, apex obtuse, base cuneate, narrowed, sessile, margins few-toothed above middle, upper surface green, lower surface pale, glandular punctate, both surfaces sparsely cobwebby hairy or glabrate.
• Heads depressed-hemispheric, 3–4 mm across, sparsely arranged in leaf axils, subsessile or short peduncled. Involucre 3.5 mm across, bracts biseriate, oblong, equal, pointed, sparsely cobwebby or glabrate on outer surface. Corolla of outer florets small, tubular, 0.2 mm long, green. Corolla of central bisexual florets 0.5 mm long, purple, lobes 4, narrow.
• Achenes ca. 1.3 mm long, 5-ridged, hirsute.
• Chromosome number, 2n = 20 (Peng & Hsu, 1978).

分布

• 台灣 : a spring annual in waste places and roadsides in lowlands; common.
• 世界 : Throughout subtropical and tropical Asia, Afghanistan, the Pacific Islands and Australia.

引證標本

TAIPEI: Nankang, Wang 694; Yangmingshan Natl. Park, Peng 12670. ILAN: Chilan, Peng 15152; Fushan Botanical Garden, Peng 13860. MIAOLI: Chunan, Lin 607; Houlong, Peng 11578. TAICHUNG: Chingshui, Peng 4483; Hoping, Wushihkeng, Shen 201. CHANGHUA: Puhsin, Chaw 744. TAINAN: Tungshan, Peng 8908; Matou, Yen 4270. PINGTUNG: Mutan, Hsuhai, Wang 2103.

參考文獻

• PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 898. 1998.  (Fl. Taiwan 2nd edit.)