生活型

herb

形態特徵

• Annual herbs; stems erect, 20–100 cm tall, sometimes purplish, branches ascending-spreading, pseudo-dichotomously branching in upper part, densely or sparsely appressed short pubescent.
• Median cauline leaves chartaceous or thinly membranaceous, long petiolate, ovate-oblong to deltoid-ovate, 5–14×3–12.5 cm, apex short acuminate to acute, base truncate to cuneate or narrowed into winged petiole, margins irregularly obtuse-dentate, 3-nerved, irregularly lobulate on lower margin, densely short pubescent on both surfaces, glandular dotted beneath; upper leaves gradually smaller and narrower, short petiolate, oblong, obtuse, uppermost oblong lanceolate, subsessile.
• Heads many, 16–21 mm wide, peduncle 1–4.5 cm long, puberulous; involucral bracts 5, spreading, stipitate glandular pilose; ray corolla 1.5–2.5 mm long; disc corolla tubular, yellow, 1.5 mm long.
• Achenes 2.5–3.5 mm long, truncate, incurved, black, glabrous, 4-angled.
• Chromosome number, 2n = 30 (Peng & Hsu, 1978). <li>It is virtually impossible to effectively distinguish <i>S. orientalis</i> from <i>S. glabrescens</i>; they are thus treated as synonymous.</li>

分布

• 台灣 : widespread in waste fields at low elevations.
• 世界 : Southeast Asia, India to Africa, Australia, Japan and China.

引證標本

TAIPEI: Nankang, Wang 753; Shihting, Peng 10598. ILAN: Chiaohsi, Lungtanhu, Liu 551; Yuanshan experimental forestry farm, Panero 6453. HSINCHU: Emei, Wang 727; Hsinfeng, Hongmaokang, Peng 13977. MIAOLI: Shihtan, Leu 923; Chunan, Lin 590. TAICHUNG: Takeng, Peng 9977; Kukuan, Peng 8722. NANTOU: Tungpu, Peng 6486; Hsinyi, Peiyushan, Chiang 105. KAOHSIUNG: Tengchih, Yang 5100. PINGTUNG: Wutai, Peng 10201; Chunjih, Tahan Forest Trail, Leu 644. TAITUNG: Lanyu Is., Yang 7745; Chingshuiyen, Yang 23731. HUALIEN: Hsiulin, Yenhai Forest Road, Wang 395.

參考文獻

• PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 1062. 1998.  (Fl. Taiwan 2nd edit.)