Th or lightly scabrous; longest branches 1? cm, with 5?five spikelets. Spikelets four?.5 mm

Fl. Belg. 82. 1828. http://species-id.net/wiki/Poa_pratensis_angustifolia Fig. 17 H, I Poa angustifolia L., Sp. Pl. 1: 67. 1753. (lectotype: LINN-87.12!, excluding second culm in the left, designated by Soreng 2000: 254). Description. Tufts sparse to dense, some shoots clustered; pale green title= 2152-7806.162550 or bluish-graygreen; tillers intra- and extravaginal. Culms 25?0 cm tall. Ligules of decrease culm and tiller leaves usually glabrous abaxially; blades of cauline leaves flag leaf blades folded or involute, with involute margins, moderately thick or thin, moderately thin or soft; sterile shoot blades 10?5 cm lengthy, 0.4? mm wide, title= 1477-7525-6-114 all involute, like or typically distinctly narrower than cauline blades, sparsely pubescent adaxially. Panicles 8?8 cm lengthy, loosely contracted, or open and narrowly pyramidal; rachis with three? branches per node; primary branches ascending to spreading, smooth, or sparsely to densely scabrous; spikelets many to numerous per branch. Spikelets narrowly lanceolate, not bulbi.Th or lightly scabrous; longest branches 1? cm, with 5?five spikelets. Spikelets 4?.5 mm lengthy, narrowly lanceolate, not bulbiferous; glumes unequal, glaucous or not; reduce glumes 1?-veined; upper glumes subequaling the lowest lemma; lemmas two.5?.5 mm long, smooth or finely muriculate, intermediate veins frequently sparsely to moderately densely brief villous; paleas scabrous, medially regularly softly puberulent more than the keels, intercostal area glabrous, or hardly ever sparsely hispidulous. 2n = 28, 32, 35, 42, 43, 48, 50, 52, 53, 56, 60, 62, 63, 64, 67?two, 84, 86, 88, 89, 92, ca. 94, ca. 124, 127. Distribution. The subspecies is circumboreal and in North America occurs in Canada, Greenland, USA, and Mexico (Nuevo Le ). Ecology. This subspecies is found in boreal to alpine forests, and it tolerates frigid Each typical and uncommon taxa, and that there is no predominance conditions. Conservation status. This native subspecies is common across Canada, and uncommon within the Rocky Mountains south of Colorado, and locally uncommon in Mexico. Specimens examined. Mexico. Nuevo Le : localizado en Galeana, Cerro el Potosi, 20?2'23"N, one hundred?3'48"W, 3650 m, 15 Aug 1998, Ing.M.Castillo-B. 345 Ing.J.Garza-C. (MEXU-1072117 MEXU 999120, p.p. "a", p.p. "b" is Poa mulleri, on each sheets, fide RJS).Robert J. Soreng Paul M. Peterson / PhytoKeys 15: 1?04 (2012)Discussion. Poa pratensis subsp. alpigena is circumboreal and native towards the New World in the arctic, alpine, subalpine, and boreal forests (Soreng 2007). This subspecies is recognizable in plastid DNA data (as a consequence of a deletion in trn-TLF) and nrDNA sequences as distinct from other title= ntr/ntt168 subspecies so far evaluated (Gillespie et al. 2005, 2007). In the reduce 48 states of USA, P. pratensis subsp. alpigena occurs at scattered areas as far south as northern Arizona and New Mexico in alpine and subalpine habitats. This subspecies also occurs in Tierra del Fuego, Chile (see variety of Poa oligeria). This can be the first report of this subspecies for Mexico, where it truly is most likely ideal considered an interglacial period relict from glacial expansions. It may be separated in the other subspecies by its loose rhizomatous habit, tiny spikelets, narrow leaves, and narrow (normally only slightly spreading) panicles. In North America, it generally has some scant hairs on the intermediate veins in the lemmas and on the palea keels.