生活型

herb

形態特徵

• Annual erect herbs. Stems branched from base, 15–40 cm tall, gray or dull gray-green villous.
• Basal leaves short lived, withering at anthesis; cauline leaves dull gray-green silky on both surfaces, linear to narrowly elliptic, 1.5–7×0.2–0.4 cm, margins entire or wavy, villous.
• Heads in loose terminal and stalked axillary spikes or panicles; subtending leaves 1–3, 1–6 cm long. Heads 3.5×2.5–3 mm when dry, woolly at base only. Outer involucral bracts ovate, short acute to acuminate, 2–3×1 mm; inner ones brownish, sometime tinged purplish, lanceolate, apex obtuse to acute, mucronate, scarious toward margins, 3–3.2×0.8 mm long. Outer florets many, filiform, corolla 2.1–2.3 mm long; central florets 2 or 3, corolla 1.6–1.7 mm long.
• Achenes elliptic, ca. 0.5 mm long. Pappus ca. 2.5 mm, connate at base into a ring.

分布

• 台灣 : seasides, sandy beaches and waste fields.
• 世界 : Probably native to South America and adventive in the United States and Japan.

引證標本

TAIPEI: Tanshui, Peng 12674. TAOYUAN: Shalun, Peng 7710. HSINCHU: Lienhuashih, Peng 11516.

引用文獻

• PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 975. 1998.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)