生活型

herb

形態特徵

• Perennial herbs, tufted compact at the base, stoloniferous; culms erect or ascending, 20-45 cm tall, 1-1.2 mm across, more or less compressed, green flushed with purple, 2-4 noded, the nodes swelled, 2.5 mm long and 1.5 mm across, purplish red.
• Leaves bluish green, blades linear, flattened, 3-8 cm long and 2-5 mm wide, obtuse, mucronate, with scabrid margins; ligule a ciliate membrane, truncate apically, 0.5 mm long, scabrous on the back; sheaths 4-6 cm long, conduplicate-keeled, with pilose orifice.
• Inflorescence of 4-10 racemes, digitate in 1-2 whorls, the primary axis 0-5 mm long; racemes 5-6 cm long, spreading or reflexed, densely bearing many spiklets on one side of the axis; rachis triquetrous and flattened, scabrous on the angles, spikelets 2-flowered, 3 mm long (excluding awns), pale-brownish and usually flushed with purple; callus covered with silky hairs ca. 0.5 mm long. Glumes hyaline, narrowly lanceolate, unequal, folded, 1-nerved, the nerve without scabrous; the lower one 1-1.8 mm long and 0.2-0.3 mm wide, the upper 2-2.8 mm long and 0.2-0.4 mm wide; lower lemma laterally folded, chartaceous, ovate-lanceolate, 3-nerved, 2.5-3 mm long and 0.6-0.8 mm wide, scabrous on the upper portions of abaxial surface, 2-lobed, awned from the sinus, the awn 5-15 mm long, apical lobes acuminate, 0.5 mm long; lower palea linear-lanceolate, 1-2 mm long and 0.1 mm wide, 2-nerved, scabrous on margins, puberulous or pubescent on apical portions; lodicules 2, 0.1 mm long; stamens 3, anthers 0.4 mm long, yellow, filament filiform 0.4 mm long; style 2, 0.3 mm long; stigma 0.5 mm long, blackish purple, plumose, included; ovary ovate to obovate, pale yellow, 0.3 mm long; upper lemma filiform, 2-2.5 mm long, apically dilated to 0.2 mm wide and bifid, puberulous on apical lobes, apical lobes narrowly acuminate, 0.4 mm long, the awn from the sinus, 2-8 mm long.
• Caryopsis pale brown, oblong, trigonous, 1.7 mm long, the hilum oblong, 0.6 mm long.

分布

• 台灣 : at lowlands in the eastern and central parts of the island. It is seen along road sides, wastelands and borders of fields, associate with other weedy plants commonly found in disturbed areas.

引證標本

Hualien co.: Gi-an Hsiang, Nanpu, Experimental Farm, along road sides, 13 December 2001, Chen s. n.; Hualien city, Geilin 9th St., along roadsides, 8 March 2004, Chen s. n.; Quang-fu Hsiang, near Mataian Hsi (river), on parking lot, 10 October 2003, Chen s. n.; Shou-fong Hsiang, near Liyu Lake, along roadsides and on borders of field, 9 May 2004, Chen s. n. (all at Herbarium, National Hualien Teachers College, HLTC). Nantou co.: Puli, Liyutan, 26 march 2004, Chung w032602 (National Cheng-Kung University Herbarium, NCKU).

參考文獻

• Shih-Huei Chen and Ming-Jou Wu, Taiwania 50(1): 29. 2005.