生活型

herb

形態特徵

• Herbaceous perennials. Stems prostrate, many from base, rooting at nodes, densely appressed strigillose.
• Leaves ovate to broadly ovate, to 35×25 mm, densely appressed strigillose on both surfaces, hirtellous especially on lower surface, apex acute, apiculate, margins crenate-serrate, base attenuate; petiole 3–8 mm long, narrowly winged toward blade, ciliate along margins.
• Heads axillary, solitary, subsessile, peduncle occasionally to 15 mm long. Involucre narrowly oblong-oblanceoloid, 6–7×2.5–3.5 mm. Involucral bracts 4, concave, lanceolate, acuminate and apiculate, entire, 6–7×3–3.5 mm, glabrous within, strigillose without, in 2 series. Paleae hyaline, narrowly elliptic, 3.5–4.8×0.8–1 mm. Ray florets 3–7(–8), yellow; corolla 4.5–6.2×1.4–1.8 mm; achenes oblanceolate, 3.5–4 mm×1.7–2 mm, tan to blackish, flattened, with small lateral wing-like projections, pappus of usually 2 ascending-divergent awns, 1.2–2.4 mm long. Disc florets 3–7(–8); corolla 2.6–3.6 mm long, densely papillose within; anthers black, 1 mm long, apical appendages lanceolate, obtuse.
• achenes similar to those of ray florets but slightly narrower and thicker, sometimes 3-angled, 1.1–1.7 mm across, evidently muricate.
• Chromosome number, 2n = 24 (Peng & Kao, 1984).

分布

• 台灣 : a weed of roadsides; sometimes cultivated as a ground cover on traffic islands.
• 世界 : From the southeastern United States to the Yucatan peninsula of eastern Mexico, and Cuba; naturalized in Hawaii.

引證標本

TAIPEI: Taipei City, Shihpai, Kao 9982; Nankang, Academia Sinica, Peng 6043. CHIAYI: Chiayi City, Yen 10585. KAOHSIUNG: Hunei, Peng 13157.

參考文獻

• PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 891. 1998.  (Fl. Taiwan 2nd edit.)