286 BOTANY. 



of Colorado).— Twin Lakes, Colorado, 1873 (1104); Arkansas Valley 

 (1105); Mosquito, Colorado (HOG); alpine woods, Colorado (1107 and 

 1108). 



Stipa Mongolica, Turcz. (Watson's Botany 40th Parallel, Synopsis 

 of Flora of Colorado).— Twin Lakes, Colorado, 1873 (1100). 



Stipa pennata, L., var. — This species, of which little was collected, is 

 easily distinguished by the awns, which are 6 inches or more long, twisted 

 for li-2 inches below, the upper part flat and beautifully plumose- 

 pennated. — Arizona. Locality not recorded. 



Stipa occidentalis, Thurb. (Watson's Botany 40th Parallel). — Nevada, 

 1871 and 1872. 



Aristida purpurascens, Poir. — Arizona, 1871 and 1872. 



Aristida purpurea, Nutt. (Watson's Botany 40th Parallel, Synopsis 

 Flora of Colorado). — Camp Bowie, Arizona, 1874 (481); Camp Grant, 

 Arizona, 1874 (374). 



Aristida purpurea, Nutt., var. longiseta. {A. longiseta, Steud.) — Per- 

 haps a distinct species. — Denver, Colorado, 1873 (1110); Santa Fe", N. 

 Mex, 1874 (1). 



Aristida Humboldtiana, Trin. (A. divaricata, H. B. K.) — Root fibrous; 

 culms csespitose, erect, simple, 1-2° high; leaves convolute, rather short 

 and rigid; panicle about 1° long, sheathed at the base, rays rather rigid, 

 in twos or threes, mostly long (3-6'), flower bearing above the middle, 

 inferior ones erect, superior ones open or spreading, most of the branch- 

 lets with 2-3 spikelets each ; glumes equal or nearly so, acute or awl- 

 pointed, 5-6" long, purplish, equal to the flower or slightly longer; palet 

 scabrous; awns sub-equal, middle ones about 8", lateral ones 4-5" long. — 

 Cottonwood, Arizona, 1874 (348). 



Spartina gracilis, Trin. (Watson's Botany 40th Parallel, Synopsis 

 Flora of Colorado).— Nevada, 1871; Saguache, Colorado, 1873 (1111). 



Pleuraphis Jamesii, Torr. (Watson's Botany 40th Parallel, Synop- 

 sis Flora of Colorado).— Arizona, 1871 and 1872; Santa F4, N. Mex., 1874 

 (17); Agua Azul, N. Mex., 1874 (132). 



Bouteloua curtipendula, Gr. — Arizona, 1871 and 1872; Camp Crit- 

 tenden and Cienega, Arizona, 1874 (284, 586, 677). 



