生活型

herb

形態特徵

• Herbs or subshrubs, procumbent to ascending. Stems well branched, sulcate-striate, glabrous, rarely sparingly puberulent.
• Leaves obovate to oblanceolate, 3–5×0.7–1.7 cm, apex obtuse to rounded, base gradually narrowed, sessile, irregularly and sparsely dentate, glabrous on both surfaces; upper leaves smaller and narrower.
• Heads 6–8 mm in diam. when fresh, to 10 mm in diam. when dried, ca. 7 mm long, short pedunculate or sessile, densely congested in terminal corymbs. Involucre ovoid to broadly campanulate, bracts glabrous, 5- or 6-seriate, outer bracts broadly ovate, obtuse to rounded, nearly entire, 2.5–4×2–3 mm; inner bracts linear to lanceolate, acute, nearly entire, 4–5×0.5–1 mm. Receptacle flat, foveolate. Outer florets numerous, corolla filiform, narrowed apically, 3.5–4 mm long, glandular; pappus nearly as long as corolla.
• Achenes cylindric, reddish brown, with pale ribs, 1–1.4× 0.2–0.3 mm, appressed strigillose and glandular. Central florets 18–22, corolla 4–5 mm long, 5-lobed, lobes triangular, glandular; pappus shorter than corolla; achenes yellowish, cylindric, grooved, 0.8–1.2×0.4–0.5 mm, strigillose.
• Chromosome number, n = 20 (Peng et al., 1998). <li>Kitamura (1937) first reported <i>P. pteropoda</i> in Taiwan based on a single specimen collected from Mt. Chilaichushan, Hualien. Kitamura's report was accepted by Li (1978), Hsu (1980), Hsu and Lu (1984) and Lai (1991), who listed <i>P. pteropoda</i> as a rare species at high elevations in the central mountain range in eastern Taiwan. A thorough search in the field, study of the relevant literature and examination of abundant herbarium materials have revealed, however, that <i>P. pteropoda</i> is a coastal species confined to southwestern Taiwan.</li>

分布

• 台灣 : coastal brackish areas and tidal flats, often associated with mangroves and near graveyards on the southwestern seashore.
• 世界 : Southern China, Indochina.

引證標本

YUNLIN: Santiaolun to Chinhu, Ou 5326; Mailiao, Peng 17134. CHIAYI: Tungshih, Shanliao Village, Peng 13470; Auko, Liao 1705. TAINAN: Chiku, Yang et al. 6504; Peimen, Kao 10862; Hsiaokeliao, Peng 10527; Yenshui, Hong s. n. 1978.

參考文獻

• PENG, Ching-I & CHUNG, Kuo-Fang; LI, Hui-Lin, Flora of Taiwan, second edition 4: 1036. 1998.  (Fl. Taiwan 2nd edit.)