Or broadly pyramidal, sparse to moderately congested, with (25?30 to over 100 spikelets; rachis with (1?2?(?9) branches per node; primary branches spreading early or late, terete or angled, smooth or sparsely to moderately densely scabrous; lateral pedicels usually 1/5?/2 the spikelet in length, smooth, or sparsely to moderately densely scabrous, prickles fairly fine; longest branches (1?2? cm, with 4?0(?0) spikelets, spikelets usually fairly crowded in distal 1/2. Spikelets 3.5?(?) mm long, to 3.5 ?long as wide, lanceolate to ovate, laterally compressed, sometimes bulbiferous; florets 2?, infrequently bulbous basally and leaf-like distally, hermaphroditic; rachilla internodes terete, mostly less than 1 mm long, smooth, glabrous; glumes narrowly lanceolate to lanceolate, infrequently broadly lanceolate, unequal to subequal, usually distinctly shorter than the adjacent lemmas, distinctly keeled, keels sparsely to densely, usually moderately, scabrous, infrequently smooth, apex acute, to acuminate; lower glumes 1.5?(?.5) mm long, 1?-veined, narrowly lanceolate, occasionally weakly sickle shaped; upper glumes 2?.5(?) mm long, distinctly shorter to nearly equaling lowest lemma, 3-veined; calluses dorsally webbed, web well developed, sometimes with secondary tufts under each marginal vein, hairs 2? mm long, woolly; lemmas 2?.3(?) mm long, lanceolate, green or strongly purple colored, distinctly keeled, keels and marginal veins long villous, intermediate veins glabrous or infrequently short villous to softly puberulent, between veins glabrous, smooth or finely muriculate, smooth or lightly scabrous above, intermediate veins prominent, margins narrowly to broadly hyaline, apices acute; paleas scabrous, medially sometimes softly puberulent over the keels, intercostal region narrow, glabrous, or rarely very sparsely and minutely hispidulous. Flowers chasmogamous; lodicules 0.35?.5(?.7) mmRobert J. FPS-ZM1 web Soreng Paul M. Peterson / PhytoKeys 15: 1?04 (2012)Figure 17. Poa pratensis L. A P. pratensis subsp. agassizensis (B. Boivin D. L e) Roy L. Taylor MacBryde A habit B sheath, ligule, blade lateral view C branch segment with spikelets D subsp. alpigena (Lindm.) Hiitonen D habit E inflorescence F branch segment with spikelets G palea H, I subsp. angustifolia (L.) Lej. H habit I branch segment with spikelets. Drawings from Soreng (2007).Revision of Poa L. (Poaceae, Pooideae, Poeae, Poinae) in Mexico: …Figure 18. Poa pratensis L. A, B P. pratensis subsp. irrigata (Lindm.) H. Lindb. A habit B spikelet C subsp. pratensis C habit D sheath, ligule blade lateral view E blade apex lateral view F blade apex adaxial view G inflorescence H branch segment with spikelets I spikelet J floret. Drawings from Soreng (2007).Robert J. Soreng Paul M. Peterson / PhytoKeys 15: 1?04 (2012)long, broadly ovate, with a short lateral lobe about midpoint; anthers 1.2? mm long, infrequently aborted late in development and ca. 1 mm long. Caryopses 1.5? mm long, elliptical in side-view, Vesatolimod chemical information slightly laterally compressed, subtrigonous in cross-section, brown, sulcus broad, shallow, hilum 0.2 mm long, round to oval, grain adherent to the palea. 2n = 28?47. Distribution. The species is distributed worldwide but absent from tropical countries except in high mountains, or where introduced. In Mexico, the species is known from Baja California, Chihuahua, Coahuila, Distrito Federal, Hidalgo, Mexico, Nuevo Le , San Luis Potos?and Veracruz. Poa pratensis subsp. agassizensis and subsp.Or broadly pyramidal, sparse to moderately congested, with (25?30 to over 100 spikelets; rachis with (1?2?(?9) branches per node; primary branches spreading early or late, terete or angled, smooth or sparsely to moderately densely scabrous; lateral pedicels usually 1/5?/2 the spikelet in length, smooth, or sparsely to moderately densely scabrous, prickles fairly fine; longest branches (1?2? cm, with 4?0(?0) spikelets, spikelets usually fairly crowded in distal 1/2. Spikelets 3.5?(?) mm long, to 3.5 ?long as wide, lanceolate to ovate, laterally compressed, sometimes bulbiferous; florets 2?, infrequently bulbous basally and leaf-like distally, hermaphroditic; rachilla internodes terete, mostly less than 1 mm long, smooth, glabrous; glumes narrowly lanceolate to lanceolate, infrequently broadly lanceolate, unequal to subequal, usually distinctly shorter than the adjacent lemmas, distinctly keeled, keels sparsely to densely, usually moderately, scabrous, infrequently smooth, apex acute, to acuminate; lower glumes 1.5?(?.5) mm long, 1?-veined, narrowly lanceolate, occasionally weakly sickle shaped; upper glumes 2?.5(?) mm long, distinctly shorter to nearly equaling lowest lemma, 3-veined; calluses dorsally webbed, web well developed, sometimes with secondary tufts under each marginal vein, hairs 2? mm long, woolly; lemmas 2?.3(?) mm long, lanceolate, green or strongly purple colored, distinctly keeled, keels and marginal veins long villous, intermediate veins glabrous or infrequently short villous to softly puberulent, between veins glabrous, smooth or finely muriculate, smooth or lightly scabrous above, intermediate veins prominent, margins narrowly to broadly hyaline, apices acute; paleas scabrous, medially sometimes softly puberulent over the keels, intercostal region narrow, glabrous, or rarely very sparsely and minutely hispidulous. Flowers chasmogamous; lodicules 0.35?.5(?.7) mmRobert J. Soreng Paul M. Peterson / PhytoKeys 15: 1?04 (2012)Figure 17. Poa pratensis L. A P. pratensis subsp. agassizensis (B. Boivin D. L e) Roy L. Taylor MacBryde A habit B sheath, ligule, blade lateral view C branch segment with spikelets D subsp. alpigena (Lindm.) Hiitonen D habit E inflorescence F branch segment with spikelets G palea H, I subsp. angustifolia (L.) Lej. H habit I branch segment with spikelets. Drawings from Soreng (2007).Revision of Poa L. (Poaceae, Pooideae, Poeae, Poinae) in Mexico: …Figure 18. Poa pratensis L. A, B P. pratensis subsp. irrigata (Lindm.) H. Lindb. A habit B spikelet C subsp. pratensis C habit D sheath, ligule blade lateral view E blade apex lateral view F blade apex adaxial view G inflorescence H branch segment with spikelets I spikelet J floret. Drawings from Soreng (2007).Robert J. Soreng Paul M. Peterson / PhytoKeys 15: 1?04 (2012)long, broadly ovate, with a short lateral lobe about midpoint; anthers 1.2? mm long, infrequently aborted late in development and ca. 1 mm long. Caryopses 1.5? mm long, elliptical in side-view, slightly laterally compressed, subtrigonous in cross-section, brown, sulcus broad, shallow, hilum 0.2 mm long, round to oval, grain adherent to the palea. 2n = 28?47. Distribution. The species is distributed worldwide but absent from tropical countries except in high mountains, or where introduced. In Mexico, the species is known from Baja California, Chihuahua, Coahuila, Distrito Federal, Hidalgo, Mexico, Nuevo Le , San Luis Potos?and Veracruz. Poa pratensis subsp. agassizensis and subsp.
