日本莠竹Microstegium japonicum (Miq.) Koidz.
日本莠竹Microstegium japonicum (Miq.) Koidz.
12.日本莠竹（拟）图版18：4-5
Microstegium japonicum (Miq.) Koidz. in Bot. Mag. Tokyo 43: 394. 1929; Ohwi in Acta Phytotax. ex Geobot. 11: 135. 1942.——Pollinia japonica Miq. in Ann. Mus. Bot. Lund-Bat. 2: 290. 1886.——Leptatherum japonicum Fr. et Sav. Enum. Pl. Jap. 2: 190, 609. 1874.——Microstegium nudum subsp. japonicum (Miq.) Tzvel. Poaceae USSR 695. 1976.
一年生蔓生草本。秆高约50厘米，节稍膨大，膝曲，无毛，下部节生根，有分枝。 叶鞘短于其节间，长2-4厘米，边缘与上部具疣基柔毛；叶舌截平，长约0.2毫米；叶 片卵状披针形，长2-4厘米，宽6-12毫米，平滑无毛，顶端尖，边缘微粗糙，基部圆形。总状花序长4-6厘米，4-5枚互生于长2-3厘米的主轴上，平滑无毛；总状花序轴节间长4-5毫米，每节着生一短柄和一长柄小穗，短小穗柄长1.5毫米，长小穗柄长约3毫米，无毛或上部微粗糙；小穗同形，长3.5-4毫米，第一颖宽约1毫米，披针形，背部扁平，平滑无毛；脊微粗糙，顶端尖，基盘具短毛；第二颖舟形；芒自第二外稃顶端伸出，长约1厘米。花果期6-9月。
产于江苏、安徽、浙江、江西、湖北、湖南等省；生于林缘沟边、山坡路旁。也分布于东亚地区。模式标本采自日本。
《Flora of China》 Vol. 22 (2006)
Microstegium japonicum (Miquel) Koidzumi
日本莠竹 ri ben you zhu
Pollinia japonica Miquel, Ann. Mus. Bot. Lugduno-Batavi 2: 290. 1866; Leptatherum japonicum (Miquel) Franchet & Savatier; Microstegium nudum (Trinius) A. Camus subsp. japonicum (Miquel) Tzvelev.
Annual. Culms trailing, rooting at lower nodes, up to 80 cm long, nodes glabrous. Leaf sheaths glabrous, one margin ciliate; leaf blades ovate-lanceolate, 2–5 × 0.6–1.2 cm, glabrous, midvein obscure except near base, base rounded, apex acute; ligule 0.2–0.5 mm. Racemes 3–7, very slender, slightly flexuous, lower becoming divaricate, 4–6 cm; rachis internodes filiform, glabrous, longer than spikelet; spikelets both pedicelled, shorter pedicel ca. 1 mm, longer 2.5–3 mm. Spikelets 3–4 mm; callus very shortly bearded or subglabrous in lower spikelet; lower glume narrowly lanceolate-oblong, back shallowly concave, 2–4-veined, keels scabrid, otherwise smooth, apex attenuate, hyaline, subacute or minutely 2-toothed; upper glume weakly keeled or rounded on back, apex acuminate; lower lemma lanceolate, hyaline, slightly shorter than glumes; upper lemma linear, hyaline, emarginate; awn very fine, flexuous, ca. 1 cm, apex hairlike, tangled; upper palea absent or minute. Anthers 2, 0.5–0.7 mm. Fl. and fr. Jul–Sep.
Mountainsides, forest margins, roadsides. Anhui, Hubei, Hunan, Jiangsu, Jiangxi, Zhejiang [Japan, Korea].
This species is very close to Microstegium nudum, but differs mainly in its pedicelled spikelets.
科名：禾本科 Gramineae
属名：莠竹属 Microstegium
12.日本莠竹（拟）图版18：4-5
Microstegium japonicum (Miq.) Koidz. in Bot. Mag. Tokyo 43: 394. 1929; Ohwi in Acta Phytotax. ex Geobot. 11: 135. 1942.——Pollinia japonica Miq. in Ann. Mus. Bot. Lund-Bat. 2: 290. 1886.——Leptatherum japonicum Fr. et Sav. Enum. Pl. Jap. 2: 190, 609. 1874.——Microstegium nudum subsp. japonicum (Miq.) Tzvel. Poaceae USSR 695. 1976.
一年生蔓生草本。秆高约50厘米，节稍膨大，膝曲，无毛，下部节生根，有分枝。 叶鞘短于其节间，长2-4厘米，边缘与上部具疣基柔毛；叶舌截平，长约0.2毫米；叶 片卵状披针形，长2-4厘米，宽6-12毫米，平滑无毛，顶端尖，边缘微粗糙，基部圆形。总状花序长4-6厘米，4-5枚互生于长2-3厘米的主轴上，平滑无毛；总状花序轴节间长4-5毫米，每节着生一短柄和一长柄小穗，短小穗柄长1.5毫米，长小穗柄长约3毫米，无毛或上部微粗糙；小穗同形，长3.5-4毫米，第一颖宽约1毫米，披针形，背部扁平，平滑无毛；脊微粗糙，顶端尖，基盘具短毛；第二颖舟形；芒自第二外稃顶端伸出，长约1厘米。花果期6-9月。
产于江苏、安徽、浙江、江西、湖北、湖南等省；生于林缘沟边、山坡路旁。也分布于东亚地区。模式标本采自日本。
《Flora of China》 Vol. 22 (2006)
Microstegium japonicum (Miquel) Koidzumi
日本莠竹 ri ben you zhu
Pollinia japonica Miquel, Ann. Mus. Bot. Lugduno-Batavi 2: 290. 1866; Leptatherum japonicum (Miquel) Franchet & Savatier; Microstegium nudum (Trinius) A. Camus subsp. japonicum (Miquel) Tzvelev.
Annual. Culms trailing, rooting at lower nodes, up to 80 cm long, nodes glabrous. Leaf sheaths glabrous, one margin ciliate; leaf blades ovate-lanceolate, 2–5 × 0.6–1.2 cm, glabrous, midvein obscure except near base, base rounded, apex acute; ligule 0.2–0.5 mm. Racemes 3–7, very slender, slightly flexuous, lower becoming divaricate, 4–6 cm; rachis internodes filiform, glabrous, longer than spikelet; spikelets both pedicelled, shorter pedicel ca. 1 mm, longer 2.5–3 mm. Spikelets 3–4 mm; callus very shortly bearded or subglabrous in lower spikelet; lower glume narrowly lanceolate-oblong, back shallowly concave, 2–4-veined, keels scabrid, otherwise smooth, apex attenuate, hyaline, subacute or minutely 2-toothed; upper glume weakly keeled or rounded on back, apex acuminate; lower lemma lanceolate, hyaline, slightly shorter than glumes; upper lemma linear, hyaline, emarginate; awn very fine, flexuous, ca. 1 cm, apex hairlike, tangled; upper palea absent or minute. Anthers 2, 0.5–0.7 mm. Fl. and fr. Jul–Sep.
Mountainsides, forest margins, roadsides. Anhui, Hubei, Hunan, Jiangsu, Jiangxi, Zhejiang [Japan, Korea].
This species is very close to Microstegium nudum, but differs mainly in its pedicelled spikelets.
