拟早熟禾Poa pseudamoena Bor

科名：禾本科 Gramineae

属名：早熟禾属 Poa

《中国植物志》第9(2)卷156页
  109．拟早熟禾 图版24：20
  Poa pseodamoena Bor in Kew Bull. 1953: 276. 1953; Bor, Grass. Burma Ceyl. Ind. Pakist. 559. 1960. ——Poa amoenal Bor in Kew Bull. 1948: 140. 1948, non Kunth. 1932.
  一年生。秆细小，高约4厘米。叶鞘平滑无毛，基生叶鞘干膜质，伸长；叶舌短，卵形，顶端尖或撕裂；叶片平滑无毛，长约4厘米，宽1-1.5毫米。圆锥花序直立，紧缩呈圆柱形，长约2.5厘米，宽6毫米，多藏于上部叶内，分枝微粗糙，单生或孪生；小穗椭圆形，含3-4小花，长约5毫米；颖片近相等，第一颖长4-4.5毫米，具1脉，边缘狭膜质，第二颖长4.5-5毫米，长圆形，顶端尖，具3脉，脊上粗糙；第一外稃长3.5-4毫米，阔椭圆形，边缘膜质，顶端尖，具5脉，完全无毛，基盘不具绵毛；内稃长圆形，两脊粗糙；小穗轴微粗糙；鳞被较宽大，具3裂齿；花药长0.6-0.7毫米。花果期夏秋季。
  产西藏。生于海拔3000-4000米高山草地。分布于印度西北部。模式标本采自印度北部。
  本种与锡金早熟禾Poa sikkimensis相似，但以植株矮小，具干膜质长叶鞘，圆锥花序紧缩，颖片长于其完全无毛的外稃，以及花药小而易识别。

《Flora of China》 Vol. 22 (2006)
Poa pseudamoena  Bor
拟早熟禾   ni zao shu he
Poa amoena Bor, Kew Bull. [3] 1948: 140. 1948, not (J. Presl) Kunth, 1833; P. platyglumis (L. Liu) L. Liu; Puccinellia platyglumis L. Liu.
Annuals or short-lived perennials, densely tufted. Culms included in the basal tufts or slightly exserted, erect or decumbent, 4–8 cm tall, smooth, nodes 1 or 2, hidden. Leaf sheaths smooth, glabrous, 1–3 cm, subequal to shorter than blade, uppermost closed for ca. 1/4 of length; blade flat or folded, thin, 1–4 cm × 1–1.6 mm, abaxially smooth, adaxially smooth or sparsely scabrid, margins smooth to scabrid; ligules 0.5–2.2 mm, abaxially smooth, apex acute, lacerate to dentate, collars smooth. Panicle contracted to subspiciform, or open at anthesis, ovoid to cylindrical, erect, 1–2.5 × 0.6–1 cm, longest internodes 0.4–0.8 cm; branches erect to ascending, 1 or 2 per node, proximally smooth, distally sparsely to moderately scabrid on weak angles, longest 0.5–1.5 cm with 1–3(–8) spikelets distally. Spikelets elliptic, pale green to purple tinged 3.2–6 mm, florets 2–4; vivipary absent; rachilla internodes 0.4–1 mm, smooth, glabrous; glumes subequal, keels smooth or sparsely scabrid, lower glume 1.8–4 mm, (1 or)3-veined, upper glume 2.4–4.6 mm, oblong, 3-veined; lemmas broadly elliptic, 2.5–4 mm, glabrous throughout, apex acute, occasionally mucronulate, keel sparsely scabrid, intermediate veins faint to moderately prominent, area between veins smooth; callus glabrous; palea smooth between veins, keels scabrid. Anthers 0.6–1 mm. Fl. and fr. Aug–Sep.
Xizang-Qinghai Plateau:grassy frost-heaved slopes, glacial outwash, lake shores; 2800–5600 m. Qinghai, S Xinjiang, Xizang [India (Uttar Pradesh)].
Poa pseudamoena is infrequently collected. It looks much like a form of Poa annua with glabrous lemmas, but with more congested panicles. The type of Puccinellia platyglumis, from SW Xizang, has smaller spikelets and a more open panicle, at least at anthesis. We have seen authentic Poa pseudamoena from S Xinjiang on mixed sheets with Puccinellia.