生活型

herb

形態特徵

• Perennial herbs, rhizomes short. Stems erect, 6–35 cm tall, sparsely puberulous, branched or unbranched, branches ascending, terminated by a head.
• Petiole winged. Radical leaves oblong, spatulate, or orbicular, 6–10×2–5.5 cm, margins entire, dentate, to lyrate-pinnatifid, terminal lobe ovate, apex obtuse, lateral segments of 2 or 3 remote pairs, unequal, oblong to obovate, dentate, apex obtuse, or sometimes oblong to linear filiform, lobes entire; minutely pilose on both surfaces. Cauline leaves usually few, remote, oblong-oblanceolate to oblanceolate, lyrate-pinnatifid, semiamplexicaul; petiole winged.
• Heads solitary. Peduncle 6–12 cm long, densely pubescent upward. Involucre hemispheric, 4–5 mm long, 7–10 mm across, bracts 2-seriate, subequal, narrowly oblong to oblong, obtuse, sparsely pubescent, margins scarious, ciliate, usually tinged reddish purple. Ray florets many, in 4 or 5 series, corolla ligulate, white, ligules 1–2 mm long, ca. 1 mm wide, sometimes purple tipped, emarginate. Disc florets bisexual, corolla greenish yellow, short tubular, 1–2 mm long, 4-lobed, stamens 4.
• Achenes oblong, compressed, ca. 2×0.8 mm, glabrous, topped by a short glandular beak-like ring, greenish brown. Pappus absent.
• Chromosome number, 2n = 36 (Peng & Hsu, 1978). <li><i>Myriactis humilis</i> is widely distributed and extremely variable in plant size and particular in leaf shape. Kitamura (1937) originally differentiated a number of species and varieties for this complex in Taiwan, but he eventually (1969) reduced all of these into a single species, <i>M. humilis</i>, which was adopted in the first edition of Flora of Taiwan (1978) and is taken up in this edition. In comparison to the original description of <i>M. humilis</i> (plants of Philippines; Merrill, 1906), many plants of Taiwan appear to be more robust, and much more variable in leaf shape.</li>

分布

• 台灣 : widespread in mountains, 1,500–3,600 m.
• 世界 : The Philippines, Borneo, New Guinea.

引證標本

TAIPEI: Wulai, Liu 57. ILAN: Chiliehting to Shenmachen, Kuoh 3063; Tsuifenghu, Lin 54. TAOYUAN: Lalashan, Peng 12119. HSINCHU: Yuanyanghu, Wang 1315. MIAOLI: Taian, Wang 1722; Tapachienshan, Peng 8501. TAICHUNG: Songkun to Sunghsuehlou, Kuoh 2842; Hsiaohsuehshanchuang to Anmashan, Wang 1677. NANTOU: Tatachiaanpu, Leu 1093; Sunlinksea Forest Recreation Area, Shen 164. CHIAYI: Alishan, Leu 170; Yushan, Lue 227. KAOHSIUNG: Paoshan Village, Ho 877; Tengchih, Huang 13865. PINGTUNG: Hsiaokueihu, Chiang 141; Peitawushan, Peng 13282. TAITUNG: Takuanshan, Peng 11773. HUALIEN: Chilaishan, Shen 65; Tayuling, Kuo 8605; Mukuashan, Peng 7279.

參考文獻

• PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 1017. 1998.  (Fl. Taiwan 2nd edit.)