生活型

herb

形態特徵

• Herbs perennial, radical blades ellipse to oblong, simple to parted, apex acute to acuminate, margin entire to loose-dentate, sparsely ciliate, both surfaces of blade glabrous, midrib sparsely pubescent on abaxial surface.
• cauline blades linear, lanceolate to oblong, simple, base amplexcaule, apex acute to acuminate, margin serrate, sparsely ciliate.
• capitulum arranged as a apical cyme or a cymose panicle, composed of ray florets, ca. 9 mm long, 3.5 mm wide; involucre 4-seried, involucral bracts linear, outer ones ca. 2.5 mm long, innermost ones to 8 mm long, elongated when fruiting, apex obtuse, villose on surface, villose hairs on outer involucres denser than that of inner ones, 1-nerved, midrib pubescent, 1.5-3 mm long, margin membranous and ciliate, cilia 0.2-0.3 mm long; chaff oblong, ca. 3.5 mm long, 1-nerved, membranous, apex bifid, ciliate and awned, awn ca. 1.5 mm long; corolla yellow, ca. 6.5 mm long, anther syngenesious, base obtuse, apex acute, ca. 0.8 mm long, stigma ca. 1.5 mm long.
• achene ellipsoid, monomorphic, scabrous, ca. 4.5 mm long, apex long-beaked, scabrous, ca. 4 mm long, pappus plumose sparingly, 4-6.5 mm long, branched bristles ca. 1 mm long.

分布

• 台灣 : this alien plant is naturalized at roadsides in the range of Yangmingshan National Park, northern Taiwan.
• 世界 : native to South America and naturalized in North America.

引證標本

Taipei City, Fongguizui, 2 Jun 2009, M.-J. Jung 4085 (TAIF), same loc., M.-J. Jung 4086 (TAIF), 26 Jun 2009, same loc., M.-J. Jung 4090 (TAIF).

引用文獻

• Ming-Jer Jung , Chien-Wen Chen and Shih-Wen Chung, Taiwania 55(4): 412-416. 2010.