531 



Bouteloua hirsiita Lag. Var. Cieuc. y I^itter. ii, |>t. 4, 141 (1S05). 



Prairies: Ifot Springs, altitude 1,100 in., Juno 111 { Xo. lloS). 



Bouteloua oli^ostachya (Xutt. ) Torr. ; Gray, I\Ian. 0(1.2,553 (1856); Jllierojioijon 

 oJigosiachyiis Xutt. Gen. i, 78 (1818). 



Prairies: Hot Springs, altitude 1,100 ni.. .]nuo 11) (X'o. 113(5). 



Bouteloua curtipendula (Mx.) Torr. in Emory, Mil. Recon. 153(1848); Chloris 

 cnrtipendiila. Mx. Fl. i, 59 (1803). 



Rare: Hot Springs, altitude 1,100 m., .Tune 19 (No. 1137). 



Bulbilis dactyloides (Nutt.) Raf. ; Kuntzo, Rev. Gen. PI. ii, 763 (1891); Sesleria 

 (ladijloidcs Xutt. Gen. 1, 65 (1818). 



Prairies: Hot Springs, altitude 1,100 in., June 13; on the Frencli Creek, oast of 

 Custer, altitude 1,400 ni., July 18 (Xo. 1138). 



Kceleria crlstata (L.) Pors. Syn. 1,97 (1805); Aira cristala L. Sp. PI. i, 6-3 (1753). 



Connnon: Hot Springs, altitude 1,100 m., .June 18; Elk Canyon, altitude 1,L'00 m. 

 Juno 30; Lead City, altitude 1,700 m., July 9; Rocliford, altitude 1,700 m., July 12 

 (No. 1139). 



Eatouia peunsylvanica (DC.) Gray, Man. e<l. 2, 558 (1856) ; Ktchria pciiiisylvanica 

 DC. Cat. Hort. Monsp. 117 (1813). 



Rare: Hot Springs, altitude 1,050 ni., June 15 (X^o. 1140). 



Catabro.sa aquatica (L.) Beauv. Agrost. 157 (1812); Aira aqiiaiica L. Sp. PI. i, 64 

 (1753). 



In a swamp near Pringle, altitude 1,500 m., August 5 (Xo. 1141). 



Eragrostis major Host, Gram. Austr. iv, 14 (1809). 



Rare: Hot Springs, altitude 1,050 m., August 9 (Xo. 1142). 



Dactylis glomerata L. Sp. PI. i, 71 (1753). 



Rare: Hot Springs, altitude 1,0.50 m., June 15 (X'o. 1143). 



Poa feiidleriana (Steud.) Vasey, 111. X^. A. Grasses, ii, 74 (1893); Erar/rostis fend- 

 Jeriiotu Steudel, Syn. PI. Gram. 278 (1855). 



The panicle is more open than usual, and the glumes are very light iu color and 

 shining. It was growing in big tufts on the prairies south of Pringle, altitude 

 1,.500 m., August 5 (Xo. 1144). 



A few hunches with broader, flat leaves and greener floweis were found at Hot 

 Springs, altitude 1,100 m., June 13 (Xo. 1145). 



Poa tenuifolia Buckley, Proc. Acad. Phila. 1862, 96 (1862). 



Of two forms collected, one is tall, 4 to 5 dm. high, with broader leaves. Elk 

 Canyon, altitude 1,200 m., June 29; Hot Springs, altitude 1,100 m., August 3 (Xo. 

 1146). Another form, referred to this species by Professor Scribner, is densely tufted, 

 1 to 2 dm. high, scabrous; leaves 3 to 7 cm. long, very narrow, soon involute, scab- 

 rous; panicle 5 to 7 cm. long, narrow, with sbort, upright branches. It differs from 

 the typical form in size, in the narrow, scabrous leaves, the smaller and more rounded 

 spikelots, and tho broader glumes. l>ry .soil : Hot Springs, altitude 1,100 m., June 13 

 (Xo. 1147). 



Poa nevadensis Vasey, Bull. Torr. Club, x, 66 (1883). 



Oil the railroad ombankiiumt above Custer, altitude 1,6.50 m.,.Iuly 16 (Xo. 1148). 



Togetlier witii the more typical form, another was growing that had a very thick 

 and dense i>ani< lo 10 to 15 cm. long and over 2 cm. wide, and large 5- to 8- flowered 

 spikelets, about 1 cm. long, on a short pedicel (Xo. 1149). 



Poa annua L. Sp. PI. i, 68 (1753). 



IJare: Elk Canyon, altitude 1,200 m., June 29 (Xo. 11.50). 



Poa pseudopratensis ' Scribner A: lvydl)erg, sjt. nov. Pi,. XX. 



(.'ulms croit. 1 to 2 feet higli from a croepiug lootstock. Sheaths smooth or very 



'Tho dcscrijjtion of this species is drawn by Prol'. F. L.amsou-Scribuer. 



