生活型

herb

形態特徵

• An annual herb; stems decumbent, 6-25 cm high, usually branched, darkish green when dry.
• Leaves membranaceous, oblong-lanceolate, the apex acute, oblique at base, 4-8 cm long, 2-3 cm wide, the margins coarsely serrate in upper half, slightly pubescent on nerves beneath.
• Male flowers in capitulum; capitulum sessile or very short-peduncled; bracts broadly ovate; perianth 4- or 5-lobed; stamens 4 or 5, opposite perianth-lobes. Female capitulum same shape as that of male one, minute; bracts densely short hirsute; perianth 3- or 5-lobed, persistent; style penicillate.
• Achenes minute, elliptic.

物候

flowering time from June to August.

分布

• 台灣 : common in wet places throughout the island at low altitudes.
• 世界 : in Japan, China, Malaysia and the Pacific islands.

引證標本

TAIPEI: Peitou, Kawakami & Sasaki s. n. July 1908. CHIAYI: Mt. Morrison, Kawakami & Mori 1987.

引用文獻

• TANG-SHUI LIU and WEN-DA HUANG, Flora of Taiwan 2: 183. 1976.  (Fl. Taiwan, 台灣植物誌)