别名：fall panicgrass;水生黍;

科名：禾本科 Gramineae

属名：黍属 Panicum

《中国植物志》第10(1)卷207页
  8．洋野黍（台湾的禾草）
  Panicum dichotomiflorum Michx. Fl. Bot. Amer. 1: 48. 1803; Hitchc. Man. Grass. Unit. Stat. ed. 2. 685. f. 1034. 1950; 台湾的禾草553A 图171. 1975; 台湾植物志5: 572. 1978.
  一年生草本。秆多分枝，高30-100厘米，无毛。叶鞘圆筒状，平滑，有光泽；叶舌很短，顶端具长纤毛；叶片线形，长15-40厘米，宽7-20毫米；主脉粗，绿白色。圆锥花序长约30厘米，每节1-5分枝，分枝粗糙，约呈45度角斜上；小穗疏生，卵状长椭圆形至披针状长椭圆形，长约2.3毫米，平滑；第一颖宽三角形，钝尖或圆钝，包围小穗基部，长为小穗的1/4-1/5；第二颖与小穗等长，具5-7脉；第一外稃与第二颖同形同大；第二外稃长椭圆形，平滑且有光泽，具5脉，在成熟时较明显。雄蕊3。染色体2n=36（Brown， 1948），54（Church.，1929；Gould，1958）。花果期6-10月。
  本种原产北美，我国台湾引种已归化；一些温带国家亦有引种。

《Flora of China》 Vol. 22 (2006)
Panicum dichotomiflorum  Michaux
洋野黍   yang ye shu
Panicum paludosum Roxburgh.
Aquatic annual or rhizomatous perennial. Culms geniculately ascending, rooting at lower nodes, branching, succulent, 30–110 cm tall, upper nodes glabrous, often conspicuous. Leaves cauline; leaf sheaths striate, glabrous, lower sheaths often inflated; leaf blades linear, flat, 7–35 × 0.5–1 cm, glabrous, scabrid, base straight or subcordate, apex acute; ligule 1–2 mm, a ciliate membrane. Panicle terminal or axillary, pyramidal when fully exserted, 10–20 cm, much branched; branches glabrous, scabrid, secondary and tertiary branches often appressed. Spikelets lanceolate to narrowly ovate, 3–4 mm, glabrous, acuminate; lower glume broadly ovate, 1/6–1/3 length of spikelet, clasping at the base of the spikelet, membranous, 0–1-veined, obtuse to acute; upper glume as long as spikelet, 7–9-veined; lower lemma similar to upper glume, palea absent or present and well developed; upper floret 2/3 length of spikelet, green or pale yellow, smooth, shiny. Fl. and fr. Jun–Oct.
Shallow waters, swampy places. Fujian, Guangdong, Guangxi, Taiwan, Yunnan [India, Malaysia; tropics of the New World].