尖颖早熟禾Poa acmocalyx Keng
尖颖早熟禾Poa acmocalyx Keng
139．尖颖早熟禾（禾本科图说）图版24：10
Poa acmocalyx Keng ex L. Liu, in Addenda;中国主要植物图说·禾本科167, 图116. 1959; 横断山区维管植物2: 2192. 1994, sine latin. descr.
多年生。秆疏丛生，直立，高约45厘米，径约1.5毫米，具3-4节，顶节位于下部1/4处。叶鞘长于节间，平滑无毛，顶生者长10-15厘米，稍长于其叶片；叶舌短，长0.5-0.8毫米；叶片上面粗糙，长7-14厘米，宽2-3毫米。圆锥花序伸展，长12-16厘米；分枝2-4枚着生于各节，细长，粗糙，直立，上部疏生1-4小穗，主枝长5-10厘米；小穗长5-6毫米，含2-3小花，灰绿色；小穗轴无毛；颖披针形，先端渐尖或具小尖头，背部点状糙涩，第一颖具3脉，长4.5-5毫米，第二颖具3-5脉，长5-6毫米，与小穗近等长；外稃质地较薄，先端稍有膜质，间脉稍明显，脊与边脉下部1/3疏具短柔毛，基盘具少量绵毛，第一外稃长4-5毫米；内稃脊糙涩；花药长约1.5毫米。花果期6-8月。
产吉林、四川北部。生于阳坡草地，海拔1000-3900米。模式标本采自吉林横道河子。
《Flora of China》 Vol. 22 (2006)
Poa lapponica subsp. acmocalyx (Keng ex L. Liu) Olonova & G. Zhu
尖颖早熟禾 jian ying zao shu he
Basionym: Poa acmocalyx Keng ex L. Liu, Fl. Reipubl. Popularis Sin. 9(2): 388. 2002.
Culms loosely tufted, ca. 45 cm, erect. Leaf sheaths glabrous, longer than internodes, uppermost 10–15 cm, almost reaching panicle, slightly longer than blade; blade 7–14 cm × 2–3 mm, adaxially scabrid; ligule 0.5–0.8 mm. Panicle effuse, 12–15 cm; primary branch 5–10 cm. Spikelets 5–6 mm, florets 2 or 3; rachilla glabrous; callus sparsely villous. Anthers ca. 1.5 mm. Fl. and fr. Jun–Aug.
* Grassy places on sunny slopes; 1000–3900 m. Jilin, N Sichuan.
This subspecies combines the characters of Poa nemoralis (ligule not exceeding ca. 1 mm) and P. palustris (rachilla glabrous). The type material of P. acmocalyx is quite mesomorphic, with the uppermost node at about the middle of the culm, although FRPS (loc. cit.) gives it as in the lower 1/4, which would be a better match for P. faberi.
科名：禾本科 Gramineae
属名：早熟禾属 Poa
139．尖颖早熟禾（禾本科图说）图版24：10
Poa acmocalyx Keng ex L. Liu, in Addenda;中国主要植物图说·禾本科167, 图116. 1959; 横断山区维管植物2: 2192. 1994, sine latin. descr.
多年生。秆疏丛生，直立，高约45厘米，径约1.5毫米，具3-4节，顶节位于下部1/4处。叶鞘长于节间，平滑无毛，顶生者长10-15厘米，稍长于其叶片；叶舌短，长0.5-0.8毫米；叶片上面粗糙，长7-14厘米，宽2-3毫米。圆锥花序伸展，长12-16厘米；分枝2-4枚着生于各节，细长，粗糙，直立，上部疏生1-4小穗，主枝长5-10厘米；小穗长5-6毫米，含2-3小花，灰绿色；小穗轴无毛；颖披针形，先端渐尖或具小尖头，背部点状糙涩，第一颖具3脉，长4.5-5毫米，第二颖具3-5脉，长5-6毫米，与小穗近等长；外稃质地较薄，先端稍有膜质，间脉稍明显，脊与边脉下部1/3疏具短柔毛，基盘具少量绵毛，第一外稃长4-5毫米；内稃脊糙涩；花药长约1.5毫米。花果期6-8月。
产吉林、四川北部。生于阳坡草地，海拔1000-3900米。模式标本采自吉林横道河子。
《Flora of China》 Vol. 22 (2006)
Poa lapponica subsp. acmocalyx (Keng ex L. Liu) Olonova & G. Zhu
尖颖早熟禾 jian ying zao shu he
Basionym: Poa acmocalyx Keng ex L. Liu, Fl. Reipubl. Popularis Sin. 9(2): 388. 2002.
Culms loosely tufted, ca. 45 cm, erect. Leaf sheaths glabrous, longer than internodes, uppermost 10–15 cm, almost reaching panicle, slightly longer than blade; blade 7–14 cm × 2–3 mm, adaxially scabrid; ligule 0.5–0.8 mm. Panicle effuse, 12–15 cm; primary branch 5–10 cm. Spikelets 5–6 mm, florets 2 or 3; rachilla glabrous; callus sparsely villous. Anthers ca. 1.5 mm. Fl. and fr. Jun–Aug.
* Grassy places on sunny slopes; 1000–3900 m. Jilin, N Sichuan.
This subspecies combines the characters of Poa nemoralis (ligule not exceeding ca. 1 mm) and P. palustris (rachilla glabrous). The type material of P. acmocalyx is quite mesomorphic, with the uppermost node at about the middle of the culm, although FRPS (loc. cit.) gives it as in the lower 1/4, which would be a better match for P. faberi.
