波密早熟禾Poa bomiensis C. Ling
波密早熟禾Poa bomiensis C. Ling
25．波密早熟禾（植物分类学报）图版17：10
Poa bomiensis C. Ling in Acta Phytotax. Sin. 17(1): 101. 图1, 1-3. 1979; 西藏植物志5: 100, 图51. 1987.
多年生，丛生。秆高20-30厘米，压扁，具2-3节。叶鞘长于节间，光滑，上部叶鞘达花序之下；叶舌膜质，顶端钝或截平，长约1毫米；叶片线形，扁平，质软而平滑，长6-8厘米，宽3-5毫米。圆锥花序狭长，稍下垂，长7-11厘米，宽1-2厘米；分枝细弱，上举，光滑或微粗糙，基部主枝长3-4厘米，孪生，下部2/3裸露。小穗椭圆形，含2-3小花，长5-6毫米，稍带紫色；小穗轴无毛；两颖不相等，顶端渐尖，脊上部粗糙，第一颖狭披针形，长3-3.5毫米，具1脉，第二颖阔披针形，长4-4.5毫米，具3脉；外稃厚纸质，卵状长圆形，长4.5-5毫米，顶端渐尖，边缘狭膜质，具5-7脉，侧脉明显隆起，背部和基盘均无毛；内稃稍短于外稃，脊上微粗糙；花药长1-1.5毫米。花果期6-9月。
产西藏（波密）。生于山地灌丛草甸，海拔4200米。模式标本采自波密古乡。
本种与P. sibirica Roshev.的区别为植株矮小，小穗较大，长5-6毫米，外稃具5-7脉，间脉隆起，花药较短。
《Flora of China》 Vol. 22 (2006)
Poa bomiensis C. Ling
波密早熟禾 bo mi zao shu he
Annuals (?or perennials), tufted, not rhizomatous; shoots extravaginal. Culms erect, solitary or few per sparse tuft, 20–35(–55) cm tall, 0.8–1.5 mm in diam., compressed, scabrid below nodes, nodes 2 or 3, 0–3 exserted. Leaf sheaths longer to slightly shorter than internodes 8–12 cm, slightly shorter than blade, uppermost closed for 3/7–1/2 of length, finely retrorsely scabrid, glabrous, keel slightly raised; blade flat, thin, 6–11 cm (uppermost often longest), 2–5 mm wide, adaxially smooth or scabrid on keel and veins, adaxially scabrid on and between veins, margins smooth to finely scabrid; ligule 1–2.5 mm, abaxially smooth, apex truncate, obtuse or acute. Panicle open, narrow, slightly lax, 7–14 × 1–3 cm, longest internodes 2–2.5 cm; branches ascending to spreading, 2 per node, slender, flexuous, proximally smooth or scabrid, distally scabrid on and sometimes between angles, longest 3–5 cm with 1–4 spikelets in distal 1/3. Spikelets elliptic, green or slightly purple tinged, 5–6 mm, florets 2 or 3; vivipary absent; rachilla scabrid, glabrous; glumes unequal, apex acuminate, upper keel and surface scabrid, lower glume subulate to narrowly lanceolate, 2.3–3.5 mm, 1- or 3-veined, upper glume lanceolate, 3.3–4.5 mm, 3-veined; lemmas ovate to oblong to lanceolate, 3.2–5 mm, apex acuminate, intermediate veins 5(–7), prominent, surfaces minutely scabrid; callus glabrous; palea finely scabrid, keels scabrid 2/3–3/4 of length. Anthers (1–)1.2–1.7 mm. Fl. and fr. Jun–Sep.
* Mountain meadows among thickets; 4000–4200 m. SE Xizang (Bomi).
Though originally described as a perennial, the two specimens seen appear to be slender-rooted annuals.
科名：禾本科 Gramineae
属名：早熟禾属 Poa
25．波密早熟禾（植物分类学报）图版17：10
Poa bomiensis C. Ling in Acta Phytotax. Sin. 17(1): 101. 图1, 1-3. 1979; 西藏植物志5: 100, 图51. 1987.
多年生，丛生。秆高20-30厘米，压扁，具2-3节。叶鞘长于节间，光滑，上部叶鞘达花序之下；叶舌膜质，顶端钝或截平，长约1毫米；叶片线形，扁平，质软而平滑，长6-8厘米，宽3-5毫米。圆锥花序狭长，稍下垂，长7-11厘米，宽1-2厘米；分枝细弱，上举，光滑或微粗糙，基部主枝长3-4厘米，孪生，下部2/3裸露。小穗椭圆形，含2-3小花，长5-6毫米，稍带紫色；小穗轴无毛；两颖不相等，顶端渐尖，脊上部粗糙，第一颖狭披针形，长3-3.5毫米，具1脉，第二颖阔披针形，长4-4.5毫米，具3脉；外稃厚纸质，卵状长圆形，长4.5-5毫米，顶端渐尖，边缘狭膜质，具5-7脉，侧脉明显隆起，背部和基盘均无毛；内稃稍短于外稃，脊上微粗糙；花药长1-1.5毫米。花果期6-9月。
产西藏（波密）。生于山地灌丛草甸，海拔4200米。模式标本采自波密古乡。
本种与P. sibirica Roshev.的区别为植株矮小，小穗较大，长5-6毫米，外稃具5-7脉，间脉隆起，花药较短。
《Flora of China》 Vol. 22 (2006)
Poa bomiensis C. Ling
波密早熟禾 bo mi zao shu he
Annuals (?or perennials), tufted, not rhizomatous; shoots extravaginal. Culms erect, solitary or few per sparse tuft, 20–35(–55) cm tall, 0.8–1.5 mm in diam., compressed, scabrid below nodes, nodes 2 or 3, 0–3 exserted. Leaf sheaths longer to slightly shorter than internodes 8–12 cm, slightly shorter than blade, uppermost closed for 3/7–1/2 of length, finely retrorsely scabrid, glabrous, keel slightly raised; blade flat, thin, 6–11 cm (uppermost often longest), 2–5 mm wide, adaxially smooth or scabrid on keel and veins, adaxially scabrid on and between veins, margins smooth to finely scabrid; ligule 1–2.5 mm, abaxially smooth, apex truncate, obtuse or acute. Panicle open, narrow, slightly lax, 7–14 × 1–3 cm, longest internodes 2–2.5 cm; branches ascending to spreading, 2 per node, slender, flexuous, proximally smooth or scabrid, distally scabrid on and sometimes between angles, longest 3–5 cm with 1–4 spikelets in distal 1/3. Spikelets elliptic, green or slightly purple tinged, 5–6 mm, florets 2 or 3; vivipary absent; rachilla scabrid, glabrous; glumes unequal, apex acuminate, upper keel and surface scabrid, lower glume subulate to narrowly lanceolate, 2.3–3.5 mm, 1- or 3-veined, upper glume lanceolate, 3.3–4.5 mm, 3-veined; lemmas ovate to oblong to lanceolate, 3.2–5 mm, apex acuminate, intermediate veins 5(–7), prominent, surfaces minutely scabrid; callus glabrous; palea finely scabrid, keels scabrid 2/3–3/4 of length. Anthers (1–)1.2–1.7 mm. Fl. and fr. Jun–Sep.
* Mountain meadows among thickets; 4000–4200 m. SE Xizang (Bomi).
Though originally described as a perennial, the two specimens seen appear to be slender-rooted annuals.
