Aul M. Peterson / PhytoKeys 15: 1?04 (2012)2950?300 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?7’34″N, 107?3’49″W, 3250-3300 m, 13 Sep 2006, P.M.Peterson 20048, F.S chez-Alvarado E.P.G ez-Ru (US); ditto, 20049 (US); ditto, on summit, 10,000?2,000 ft [3050-3660 m], 16-17 Oct 1959, D.S.Correll 23177 H.S.Gentry (LL). Discussion. When the second author FPS-ZM1 dose 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).12. Poa mulleri Swallen, J. Wash. Acad. Sci. 30(5): 211. 1940. http://species-id.net/wiki/Poa_mulleri Figs 12, 13 A-D Type: Mexico, Nuevo Le , Municipio de Galeana, collected in pine woods on the Peak of Cerro Potos? 21 Jul 1935, C.H. Meuller 2251 (holotype: US-1645320!; isotypes: GH!, US-1646008!). Description. Hermaphroditic. Perennials; tufted, tufts dense, fairly small and low (mostly 6?0 cm tall), pale green, to slightly bluish-grey-green; tillers intravaginal (each subtended by a single elongated, 2-keeled, longitudinally split prophyll), and extravaginal (basally cataphyllous), without lateral or downward tending, cataphyllous shoots, sterile shoots more numerous than flowering shoots. Culms 9?8(?2) cm tall, erect to loosely ascending, sometimes decumbent or geniculate, terete, smooth; nodes 2?, upper 0?(?) exerted, uppermost at mid-culm. Leaves mostly basal; leaf sheaths slightly keeled, smooth, glabrous; butt sheaths papery or becoming slightly fibrous in age, smooth glabrous; flag leaf sheaths 4?(?1) cm long, margins fused 13?5 their length, sheath ca. 2? ?longer than its blade; collars smooth, glabrous; ligules 0.25?.8 mm long, abaxially minutely scabrous, upper margin irregular, minutely scabrous; apex truncate, sterile shoot ligules like those of the culm leaves; blades to 8(?2) cm long, 1? mm wide, involute, margins inrolling, soft, Nutlin-3a chiralMedChemExpress Nutlin-3a chiral moderately thick, abaxially smooth, papilliate, veins slightly expressed, margins scabrous, adaxially papilliate, slightly scabrous over the costae, apex prow-tipped; culm blades more or less equal in length or the middle ones longest, flag leaf blades 0.9?.5 cm long; sterile shoot blades like those of the culm blades. Panicles 3.4? cm long, erect, open, pyramidal, exerted, fairly sparse, with 20?0 spikelet, peduncles and axis smooth or sparsely scabrous, proximal internode 0.7? cm long; rachis with branches (1?2 per node; primary branches widely spreading to reflexed, slightly flexuous, weakly to distinctly angled, moderately to densely scabrous, hooks mostly on the angles, minutely papilliate; lateral pedicels mostly 1/5?/2 the spikelet in length, sparsely to moderately coarse scabrous, densely papilliate; longest branches 1.4?.8 cm, with 3? spikelets somewhat clustered, in theRevision of Poa L. (Poaceae, Pooideae, Poeae, Poinae) in Mexico: …Figure 12. Poa mulleri Swallen. Photo of holotype collection (Mueller 2251).Robert J. Soreng Paul M. Peterson / PhytoKeys 15: 1?04 (2012)Figure 13. A Poa mulleri Swallen A spikelet B floret C palea D pistil E Poa seleri Pilg. E spikelet F floret G palea H pistil I Poa scaberula Hook.f. I spikelet J floret K palea L pistil M Poa orizabensis Hitchc. M spikelet N floret O palea P Poa ruprechtii Peyr. P spikelet Q fl.Aul M. Peterson / PhytoKeys 15: 1?04 (2012)2950?300 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?7’34″N, 107?3’49″W, 3250-3300 m, 13 Sep 2006, P.M.Peterson 20048, F.S chez-Alvarado E.P.G ez-Ru (US); ditto, 20049 (US); ditto, on summit, 10,000?2,000 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).12. Poa mulleri Swallen, J. Wash. Acad. Sci. 30(5): 211. 1940. http://species-id.net/wiki/Poa_mulleri Figs 12, 13 A-D Type: Mexico, Nuevo Le , Municipio de Galeana, collected in pine woods on the Peak of Cerro Potos? 21 Jul 1935, C.H. Meuller 2251 (holotype: US-1645320!; isotypes: GH!, US-1646008!). Description. Hermaphroditic. Perennials; tufted, tufts dense, fairly small and low (mostly 6?0 cm tall), pale green, to slightly bluish-grey-green; tillers intravaginal (each subtended by a single elongated, 2-keeled, longitudinally split prophyll), and extravaginal (basally cataphyllous), without lateral or downward tending, cataphyllous shoots, sterile shoots more numerous than flowering shoots. Culms 9?8(?2) cm tall, erect to loosely ascending, sometimes decumbent or geniculate, terete, smooth; nodes 2?, upper 0?(?) exerted, uppermost at mid-culm. Leaves mostly basal; leaf sheaths slightly keeled, smooth, glabrous; butt sheaths papery or becoming slightly fibrous in age, smooth glabrous; flag leaf sheaths 4?(?1) cm long, margins fused 13?5 their length, sheath ca. 2? ?longer than its blade; collars smooth, glabrous; ligules 0.25?.8 mm long, abaxially minutely scabrous, upper margin irregular, minutely scabrous; apex truncate, sterile shoot ligules like those of the culm leaves; blades to 8(?2) cm long, 1? mm wide, involute, margins inrolling, soft, moderately thick, abaxially smooth, papilliate, veins slightly expressed, margins scabrous, adaxially papilliate, slightly scabrous over the costae, apex prow-tipped; culm blades more or less equal in length or the middle ones longest, flag leaf blades 0.9?.5 cm long; sterile shoot blades like those of the culm blades. Panicles 3.4? cm long, erect, open, pyramidal, exerted, fairly sparse, with 20?0 spikelet, peduncles and axis smooth or sparsely scabrous, proximal internode 0.7? cm long; rachis with branches (1?2 per node; primary branches widely spreading to reflexed, slightly flexuous, weakly to distinctly angled, moderately to densely scabrous, hooks mostly on the angles, minutely papilliate; lateral pedicels mostly 1/5?/2 the spikelet in length, sparsely to moderately coarse scabrous, densely papilliate; longest branches 1.4?.8 cm, with 3? spikelets somewhat clustered, in theRevision of Poa L. (Poaceae, Pooideae, Poeae, Poinae) in Mexico: …Figure 12. Poa mulleri Swallen. Photo of holotype collection (Mueller 2251).Robert J. Soreng Paul M. Peterson / PhytoKeys 15: 1?04 (2012)Figure 13. A Poa mulleri Swallen A spikelet B floret C palea D pistil E Poa seleri Pilg. E spikelet F floret G palea H pistil I Poa scaberula Hook.f. I spikelet J floret K palea L pistil M Poa orizabensis Hitchc. M spikelet N floret O palea P Poa ruprechtii Peyr. P spikelet Q fl.
