生活型

herb

形態特徵

• Stems woody at base, decumbent with adventitious roots, then erect, about 50 cm tall.
• Phyllotaxis alternate, radical leaves simple, withered by anthesis, cauline leaves linear, simple, occasionally lobed, 2-5 cm long, 0.5-0.7 cm broad, amplexicaul, incised, acute, glabrous, with one clear midrib.
• Capitula (heads) radiate, numerous to terminal or terminal and upper axillary corymbs. Involucre subcylindric, 4 mm long, 3 mm broad, calyculate; outer bracts linear, 2 mm long, 0.5 mm broad, glabrous, purplish at margin, apex obtuse; inner bracts ca. 21, oblong, glabrous, apex obtuse, purplish. Ray florets ca. 13, female, pappus whitish, corolla tube 2 mm long; rays yellow, 5-7 mm long, 2-3 mm broad; disc florets ca. 90, bisexual, corolla yellow, 3-4 mm long. Stamens 5, anthers syngenesious, not caudate; filaments collar dilated. Style branches truncate, with a crown of hairs.
• Achenes ellipsoid, 1.5 mm long, 0.4 mm broad, 10-ribbed, and the ribs with hispid. Pappus whitish, 4 mm long, with many fine bristles.

分布

• 台灣 : only one population was found at Tenghie, the middle-altitude mountain area in the southern Taiwan.
• 世界 : Narrow-leaved ragwort, Molteno disease senecio, and Canary weed and Burchell senecio. Spread areas of <i>S. inaequidens</i> include South Africa, Europe continent, and Southern America.

引證標本

TAIWAN－Kaohsiung Hsien: Taoyuan Hsiang, Tenghie forest road, M.-J. Jung x040101, x040107, x040108, x040109, M.-J. Jung x041002, x041003, x041004 (NCKU).

參考文獻

• Ming-Jer Jung, Sheng-Zehn Yang and Chang-Sheng Kuoh, Taiwania 50(3): 191-199. 2005.