生活型

herb

形態特徵

• Plants annual. Stems decumbent to usually erect, not rooting at nodes, green to red, glabrous.
• Petiole 2–6.4 cm long, glabrous to very sparsely pilose, narrowly winged. Leaf blade 5–10×4–8 cm, broadly ovate to deltate, base truncate to short attenuate, apex short acuminate to usually acute, usually glabrous on both surfaces, margins dentate.
• Peduncle 3.5–12.5 cm long, glabrous to very sparsely pilose. Heads discoid, 10.5–23.5 mm tall, 11–17 mm in diam. Receptacle 8.3–21.5 mm tall, 3.5–8.5 mm in diam. Involucral bracts 15–18, triseriate, herbaceous, entire to sinuate, sparsely ciliate; bracts of outer series 5 or 6, 5.8–7.3×2.1–2.8 mm, usually narrowly ovate to lanceolate or sometimes ovate, acute. Disc florets 400–600; corolla 2.7–3.3 mm long, yellow, 5-merous; tube 0.5–0.7 mm long, 0.2–0.4 in diameter; lobes 0.3–0.6×0.2–0.4 mm; stamens 1.4–1.7 mm long.
• achenes 2–2.5×0.9–1.1 mm, moderately to densely ciliate with straight-tipped hairs. Pappus of 2 subequal bristles, longer one 0.5–1.5 mm long, shorter one 0.3–1.3 mm long.

分布

• 台灣 : cultivated for medicinal, insecticidal and horticultural purposes.
• 世界 : Known only from cultivation worldwide.

引證標本

TAIPEI: Nankang, Peng 10689, 12485. HSINCHU: Hsinfeng, Peng 6389.

參考文獻

• PENG, Ching-I, CHUNG, Kuo-Fang & LI, Hui-Lin. Flora of Taiwan, second edition 4: 812. (Fl. Taiwan 2nd edit.)