生活型

herb

形態特徵

• Annuals; culm slightly compressed, base geniculate and usually rooting.
• Blade 6-20 cm long, 3-8 mm wide; sheath keeled, overlapping at base; ligule a ring of hairs, ca. 1 mm long.
• Inflorescence a single raceme, 3-10 cm long; axis scabrous. Spikelets 3-6, lanceolate, acuminate, 4.5-7 mm long, enclosed in a spiny bur; lower glume narrow, 1-veined, ca. 2.5 mm long; upper glume 2/3-3/4 as long as subequal lower and upper lemma; anther ca. 2.8 mm long.
• Bur truncate at base, body 4-7 mm high, as broad or broader, pubescent, outer bristles slender, usually less numerous, inner bristles stout, usually broadened at base and equaling lobes of body or shorter, lobes of body 10, often pilose, erect or bent inwards.

分布

• 台灣 : in sandy places.
• 世界 : Tropical America, but naturalized in many warmer regions of the world.

引證標本

TAIPEI: Chinshan, Kuoh 1443; Fulung, Hsu 890. MIAOLI: Lungkan, Chuang 2588. YUNLIN: Huwei, Hsu 677. TAINAN: Tainan, Hsu 710. KAOHSIUNG: Kaohsiung, Hsu 292. PENGHU: Pneghu, Hsu 672. PINGTUNG: Kenting, Hsu 520. TAITUNG: Taitung, Kao 2527; Lanyu Is., Sasaki s. n.

引用文獻

• HSU, Chien-Chang, Flora of Taiwan, second edition 5: 462. 2000.  (Fl. Taiwan 2nd edit., 台灣植物誌第二版)