. gymnantha sensu Negritto et al. (2008), we have made over 84 collections of

. gymnantha sensu Negritto et al. (2008), we have made over 84 collections of this species from across its Andean range, and examined many other collections at LPB, US, USM. We cannot find a single morphological feature that can be used to separate these taxa, and instead only see a range or continuum of these features across the entire range. Negritto in Giussani et al. (2012) now accepts P. ovata and P. pseudoaequigluma as synonyms with expressed need for further study. The description provided here isRevision of Poa L. (Poaceae, Pooideae, Poeae, Poinae) in Mexico: …based on one small Mexican collection, with extreme ranges from South American material noted in MS-275 site parentheses [given as “(?)” where the full character state range was not documented for South America samples]. In South America small and large plants (P. gymnantha s.s.) are often mixed within populations, and the stature appears to depend on elevation and microhabitat variations in moisture and light intensity, and exposure to herbivory. Although the type and few other specimens of P. ovata have well developed stamens, hundreds of other specimens examined have only staminodes and regularly produce seed, a situation that indicates apomixis (Soreng and Van Devender 1989; Negritto et al. 2008). John Beaman (notes in US herbarium) intended to describe his no. 2342 as a new species, with the epithet “acrophila”. The features that join the Mexican collection with P. gymnantha s.l. are the small stature (5 to 6 cm tall); very narrow, contracted panicles (most like the type of P. pseudoaequigluma); basal sheaths that become a bit fibrous in age; leaf-blades involute, abaxially smooth, with scabrous margins and densely scaberulous adaxial surfaces; ligules abaxially scabrous; lemmas that are glabrous, the apical 1/3-1/4 portion brown, scareous, and scaberulous; and florets pistillate. In contrast to P. chamaeclinos, the tufts of P. gymnantha are erect, not mat forming, leaf blades are erect to ascending, involute and adaxially densely scaberulous, the lemmas are distally scabrous with indistinct lateral veins. Although both species generally occur between 4000?000 m, from our experience in the Andes, P. gymnantha grows on dry slopes and plains, instead of perennially wet or “waterlogged” habitats. We provide a photo of the Beaman collection from Mexico (Fig. 9) but chose to illustrate a Peruvian specimen with 2-flowered spikelets (Fig. 6 A ) because the Beaman specimens are quite depauperate and immature. In South America depauperate specimens of the species with one-flowered spikelets are fairly common.10. Poa infirma Kunth, Nov. Gen. Sp. (quarto ed.) 1: 158. 1815 [1816]. http://species-id.net/wiki/Poa_infirma Fig. 2 F Megastachya infirma (Kunth) Roem. Schult., Syst. Veg., editio decima sexta 2: 585. 1817. Eragrostis infirma (Kunth) Steud., Nomencl. Bot. (ed. 2) 1: 563. 1840. Ochlopoa infirma (Kunth) H.Scholz, Ber. Inst. Lanschafts-Pflanzenokologie Univ. Hohenheim Beih. 16: 59. 2003.Type: Nova Granada, Aug 1801, Humboldt Bonpland 134 (holotype P-HUMB!; isotypes: B-WILLD-1974! pl. 223, LE-TRIN-2638.01 fragm. illustr.!, US-1851276! fragm. ex P, US-2851277! fragm. ex P-HUMB). Description. Gynomonoecious or hermaphroditic. Annuals; tufted, tufts mostly small, bases narrow, light green; tillers intravaginal (each subtended by a single 2-keeled, longitudinally split prophyll over 0.5 cm long), without cataphyllous shoots, most shoots U0126-EtOH site flowering. Culms 2?8 cm tall, spreading to er.. gymnantha sensu Negritto et al. (2008), we have made over 84 collections of this species from across its Andean range, and examined many other collections at LPB, US, USM. We cannot find a single morphological feature that can be used to separate these taxa, and instead only see a range or continuum of these features across the entire range. Negritto in Giussani et al. (2012) now accepts P. ovata and P. pseudoaequigluma as synonyms with expressed need for further study. The description provided here isRevision of Poa L. (Poaceae, Pooideae, Poeae, Poinae) in Mexico: …based on one small Mexican collection, with extreme ranges from South American material noted in parentheses [given as “(?)” where the full character state range was not documented for South America samples]. In South America small and large plants (P. gymnantha s.s.) are often mixed within populations, and the stature appears to depend on elevation and microhabitat variations in moisture and light intensity, and exposure to herbivory. Although the type and few other specimens of P. ovata have well developed stamens, hundreds of other specimens examined have only staminodes and regularly produce seed, a situation that indicates apomixis (Soreng and Van Devender 1989; Negritto et al. 2008). John Beaman (notes in US herbarium) intended to describe his no. 2342 as a new species, with the epithet “acrophila”. The features that join the Mexican collection with P. gymnantha s.l. are the small stature (5 to 6 cm tall); very narrow, contracted panicles (most like the type of P. pseudoaequigluma); basal sheaths that become a bit fibrous in age; leaf-blades involute, abaxially smooth, with scabrous margins and densely scaberulous adaxial surfaces; ligules abaxially scabrous; lemmas that are glabrous, the apical 1/3-1/4 portion brown, scareous, and scaberulous; and florets pistillate. In contrast to P. chamaeclinos, the tufts of P. gymnantha are erect, not mat forming, leaf blades are erect to ascending, involute and adaxially densely scaberulous, the lemmas are distally scabrous with indistinct lateral veins. Although both species generally occur between 4000?000 m, from our experience in the Andes, P. gymnantha grows on dry slopes and plains, instead of perennially wet or “waterlogged” habitats. We provide a photo of the Beaman collection from Mexico (Fig. 9) but chose to illustrate a Peruvian specimen with 2-flowered spikelets (Fig. 6 A ) because the Beaman specimens are quite depauperate and immature. In South America depauperate specimens of the species with one-flowered spikelets are fairly common.10. Poa infirma Kunth, Nov. Gen. Sp. (quarto ed.) 1: 158. 1815 [1816]. http://species-id.net/wiki/Poa_infirma Fig. 2 F Megastachya infirma (Kunth) Roem. Schult., Syst. Veg., editio decima sexta 2: 585. 1817. Eragrostis infirma (Kunth) Steud., Nomencl. Bot. (ed. 2) 1: 563. 1840. Ochlopoa infirma (Kunth) H.Scholz, Ber. Inst. Lanschafts-Pflanzenokologie Univ. Hohenheim Beih. 16: 59. 2003.Type: Nova Granada, Aug 1801, Humboldt Bonpland 134 (holotype P-HUMB!; isotypes: B-WILLD-1974! pl. 223, LE-TRIN-2638.01 fragm. illustr.!, US-1851276! fragm. ex P, US-2851277! fragm. ex P-HUMB). Description. Gynomonoecious or hermaphroditic. Annuals; tufted, tufts mostly small, bases narrow, light green; tillers intravaginal (each subtended by a single 2-keeled, longitudinally split prophyll over 0.5 cm long), without cataphyllous shoots, most shoots flowering. Culms 2?8 cm tall, spreading to er.