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Flora of Taiwan | Family List | Compositae | Calyptocarpus

Calyptocarpus vialis Less., Syn. Gen. Comp. 221. 1832; Peng & Kao, Bot. Bull. Acad. Sin. 25: 172, figs. 1, 2. 1984.


Calyptocarpus vialis

Credit: HAST

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).

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

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


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