Mooth or lightly scaberulous. Flowers; lodicules 0.5 mm long, narrowly lanceolate, unlobed; anthers 0.5?.1 mm long, those of the upper flower vestigial or sometimes poorly formed but not much reduced. Caryopses 1.3 mm long, elliptical in side-view, laterally compressed, slightly sulcate, hilum oval about 0.2 mm long, grain adherent to the palea. 2n = unknown. Distribution. The species occurs in Bolivia and Peru, and in Mexico it is known from the states of Mexico, Puebla, San Luis Potos? PD98059 chemical information Tlaxcala, and Veracruz. Ecology. This species is found on fairly well drained alpine volcanic slopes between 3800?550 m. Flowering August to September. Specimens examined. Mexico. San Luis Potos? Virlet d’Aoust 1434 (US fragm.). Puebla: Ixtaccihuatl, Oct 1905, C.A.Purpus 1633 (US). Ixtaccihuatl S flank, in circ E of the “portal” N of La Amacuilecatl (Los Pies), 4400-4450 m, 19.15426 , 98.63072 , 3 Oct 1987, R.J.Soreng 3317 N.Soreng (US). falda SO de Ixtaccihuatl, 3800 m, 1 May 1952, E.Matuda 26104 (US). Municipio de San Nicoas de los Ranchos La Joya, Volc Ixtaccihuatl, 7 km a N de al carretara pavimento a Amecameca, 3920?000 m, 28 Oct 1976, S.D.Koch 76236 (US). north side of Popocatepetl, 11 Sep 1957, J.H.Beaman 1732 (US). Mexico: Tlaloc, near summit, 4100?140 m, 22 Aug 1958, J.H.Beaman 2329 (US). Nevado de Toluca, 1865?866, Hann s.n. (P, US fragm. ex P-STEUD). Nevado de Toluca, 13500 ft [4115 m], (19?6’00″N, 99?5’36″W), bottom of the crater, 01 Sep 1892, C.G.Pringle 4222 (MO not seen, US, US, US); ditto, summit, 4545 m., 09 Oct 1986, P.M.Peterson 04655 C.R.DalfopristinMedChemExpress RP54476 Annable (US); ditto, on south rim of crater, 8 Sep 1957, J.H.Beaman 1692 (US). Laguna de Sol, 13 miles east of Mex. highway 3 on road to Nevado de Toluca., 4000 m., 08 Oct 1986, P.M.Peterson 4646 C.R.Annable (US). Tlaxcala: Malinche, North rim of the crater, 4400?4450 m, 10 Aug 1958, J.H.Beaman 2240 (US). Veracruz: Summit of Cofre de Perote, 19?9’42″N, 97?8’55″W, 4140 m, 20 Sep 1997, S.J.Darbyshire 4806 M.Gonz es-Ledesma (US). Discussion. First reported from Mexico by Fournier (1886) as Dissanthelium sclerochloides, Beetle (1987) accepted D. mathewsii Ball as the correct name. Soreng (1998) and Refulio-Rodr uez et al. (2012) concluded there were too many intermediates between this and the smaller and shorter spikeleted D. calycina (J. Presl) Kunth, and therefore, treated the taxon as a subspecies or variety. Poa calycina var. calycina and var. mathewsii are known from Bolivia and Peru. Historically, the species was treated within Dissanthelium. However, DNA analyses have confirmed that all elements of that genus belong within Poa (Refulio-Rodr uez et al. 2012). All but one species formerly placed in Dissanthelium differ from other Poa by having spikelets with two florets, lemmas 3-nerved (rare in Poa), and glumes that are longer than at least the lowest lemma (a feature that occurs infrequently in other groups of Poa). Poa calycina belongs to P. sect. Dissanthelium (Trin.) Refulio (see also Poa thomasii below).Robert J. Soreng Paul M. Peterson / PhytoKeys 15: 1?04 (2012)6. Poa chamaeclinos Pilg., Bot. Jahrb. Syst. 37: 379. 1906. http://species-id.net/wiki/Poa_chamaeclinos Figs 6 F , 7 Type: Peru, in andibus elevatis supra Lima ad 4500 m, Mar 1904, A.Weberbauer 5118 (lectotype: USM!, designated by Anton and Negritto 1997: 237; isolectotypes: BAA-2510!, US-89685! fragm. ex B). Description. Pistillate. Perennials; mat forming, mats dense (to 20 cm across), low (mostly 1.5? cm tall), green; ti.Mooth or lightly scaberulous. Flowers; lodicules 0.5 mm long, narrowly lanceolate, unlobed; anthers 0.5?.1 mm long, those of the upper flower vestigial or sometimes poorly formed but not much reduced. Caryopses 1.3 mm long, elliptical in side-view, laterally compressed, slightly sulcate, hilum oval about 0.2 mm long, grain adherent to the palea. 2n = unknown. Distribution. The species occurs in Bolivia and Peru, and in Mexico it is known from the states of Mexico, Puebla, San Luis Potos? Tlaxcala, and Veracruz. Ecology. This species is found on fairly well drained alpine volcanic slopes between 3800?550 m. Flowering August to September. Specimens examined. Mexico. San Luis Potos? Virlet d’Aoust 1434 (US fragm.). Puebla: Ixtaccihuatl, Oct 1905, C.A.Purpus 1633 (US). Ixtaccihuatl S flank, in circ E of the “portal” N of La Amacuilecatl (Los Pies), 4400-4450 m, 19.15426 , 98.63072 , 3 Oct 1987, R.J.Soreng 3317 N.Soreng (US). falda SO de Ixtaccihuatl, 3800 m, 1 May 1952, E.Matuda 26104 (US). Municipio de San Nicoas de los Ranchos La Joya, Volc Ixtaccihuatl, 7 km a N de al carretara pavimento a Amecameca, 3920?000 m, 28 Oct 1976, S.D.Koch 76236 (US). north side of Popocatepetl, 11 Sep 1957, J.H.Beaman 1732 (US). Mexico: Tlaloc, near summit, 4100?140 m, 22 Aug 1958, J.H.Beaman 2329 (US). Nevado de Toluca, 1865?866, Hann s.n. (P, US fragm. ex P-STEUD). Nevado de Toluca, 13500 ft [4115 m], (19?6’00″N, 99?5’36″W), bottom of the crater, 01 Sep 1892, C.G.Pringle 4222 (MO not seen, US, US, US); ditto, summit, 4545 m., 09 Oct 1986, P.M.Peterson 04655 C.R.Annable (US); ditto, on south rim of crater, 8 Sep 1957, J.H.Beaman 1692 (US). Laguna de Sol, 13 miles east of Mex. highway 3 on road to Nevado de Toluca., 4000 m., 08 Oct 1986, P.M.Peterson 4646 C.R.Annable (US). Tlaxcala: Malinche, North rim of the crater, 4400?4450 m, 10 Aug 1958, J.H.Beaman 2240 (US). Veracruz: Summit of Cofre de Perote, 19?9’42″N, 97?8’55″W, 4140 m, 20 Sep 1997, S.J.Darbyshire 4806 M.Gonz es-Ledesma (US). Discussion. First reported from Mexico by Fournier (1886) as Dissanthelium sclerochloides, Beetle (1987) accepted D. mathewsii Ball as the correct name. Soreng (1998) and Refulio-Rodr uez et al. (2012) concluded there were too many intermediates between this and the smaller and shorter spikeleted D. calycina (J. Presl) Kunth, and therefore, treated the taxon as a subspecies or variety. Poa calycina var. calycina and var. mathewsii are known from Bolivia and Peru. Historically, the species was treated within Dissanthelium. However, DNA analyses have confirmed that all elements of that genus belong within Poa (Refulio-Rodr uez et al. 2012). All but one species formerly placed in Dissanthelium differ from other Poa by having spikelets with two florets, lemmas 3-nerved (rare in Poa), and glumes that are longer than at least the lowest lemma (a feature that occurs infrequently in other groups of Poa). Poa calycina belongs to P. sect. Dissanthelium (Trin.) Refulio (see also Poa thomasii below).Robert J. Soreng Paul M. Peterson / PhytoKeys 15: 1?04 (2012)6. Poa chamaeclinos Pilg., Bot. Jahrb. Syst. 37: 379. 1906. http://species-id.net/wiki/Poa_chamaeclinos Figs 6 F , 7 Type: Peru, in andibus elevatis supra Lima ad 4500 m, Mar 1904, A.Weberbauer 5118 (lectotype: USM!, designated by Anton and Negritto 1997: 237; isolectotypes: BAA-2510!, US-89685! fragm. ex B). Description. Pistillate. Perennials; mat forming, mats dense (to 20 cm across), low (mostly 1.5? cm tall), green; ti.
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