裂穎雀稗

Paspalum fimbriatum drawing Credit: CC Hsu

Annuals; culms erect, 30-100 cm high. Blade linear, usually 20-30 cm long, 3-15 mm wide, margins ciliate, ciliated also at mouth of sheath; ligule truncate, ca. 2 mm long, membranaceous; sheath sparingly long hairy, shorter than internode. Racemes 3-8, racemosely arranged, 2.5-8 cm long; rachis 8-10 cm long, axils with long stiff hairs. Spikelets ovate, mucronate, ca. 2 mm long, usually paired, arranged along a flat, serrate-margined rachis; basal spikelet often reduced to mere scale; lower glume reduced; upper glume equaling spikelet, margins with stiff, serrulate wings of ca.1 mm wide, 3-5-veined; lower lemma broadly winged. Upper floret smooth and shiny, slightly shorter than spikelet.

Originally from S. America, naturalized in Taiwan.