Revision of Poa L. (Poaceae, Pooideae, Poeae, Poinae) in Mexico: new records, re-evaluation of P. ruprechtii, and two new species, P. palmeri and P. wendtii Author Soreng, Robert J. Department of Botany, National Museum of Natural History, Smithsonian Institution Washington, DC, 20013 - 7012, USA Author Peterson, Paul M. Department of Botany, National Museum of Natural History, Smithsonian Institution Washington, DC, 20013 - 7012, USA text PhytoKeys 2012 2012-08-06 15 1 104 http://dx.doi.org/10.3897/phytokeys.15.3084 journal article http://dx.doi.org/10.3897/phytokeys.15.3084 1314-2003-15-1 FF9AC356FFDAFB26FF95FFE3FFA1520C 576134 11b. Poa matris-occidentalis mohinorensis Soreng & P.M. Peterson, Sida 22(2): 911, f. 1d, 2a-b. 2006 Figs 10 D 11 A, B Type: Mexico, Chihuahua, Municipio de Guadalupe y Calvo, Sierra Madre Occidental, N side of Cerro Mohinora, ca. 13 mi SW of Guadalupe y Calvo, open pine-fir woods with scattered spruce, nearly vertical, N facing rock wall, very moist with many bryophytes and rich herbaceous flora, 25°57'N , 107°03'W , 2950 m, 20 Aug 1988, G.Nesom & A.McDonald 6475 (holotype: TEX!; isotype: ARIZ!). Description. Leaf sheaths retrorsely scabrous to puberulent; collars ciliate; ligules abaxially puberulent. Lemma keel and marginal veins proximally puberulent, between veins densely scabrous. Lodicules 0.75 mm long, broadly ovate with a broad lateral lobe. Distribution. This subspecies is known only from the Sierra Mohinora, Chihuahua. Ecology. The subspecies is found on moist rocky ledges and cliffs associated with Juniperus , Pinus , Abies , Picea , Holodiscus , Silene , Cerastium , Deschampsia cespitosa (L.) P. Beauv., Bromus carinatus , Muhlenbergia vaginata Swallen, and Muhlenbergia cenchroides ; from 2950 -3300 m (see below, Correll's estimation is too high according to the geodetic mark at the top of the peak). Flowering August to October. Specimens examined. Mexico. Chihuahua: Sierra Mohinora, near Cumbre Mohinora, 25°57'34"N , 107°03'49"W , 3250-3300 m, 13 Sep 2006, P.M.Peterson 20048, F. Sanchez-Alvarado & E.P. Gomez-Ruiz (US); ditto, 20049 (US); ditto, on summit, 10,000-12,000 ft [3050-3660 m], 16-17 Oct 1959, D.S.Correll 23177 & H.S.Gentry (LL). Discussion. When the second author visited the type locality in 2006, the habitat within 5 km of the peak was found to be quite disturbed by grazing and logging. The holotype was initially determined as Poa tracyi "vel. aff." by J.R & C.G. Reeder in 1989).