INDEX. 



163 



175 

 124 

 148 



222 

 222 

 40 

 168 

 314 

 315 

 316 

 319 

 321 

 321 

 323 

 315 

 318 



315 



318 

 319 



Abola 



Ac hat 1 in 



Achnatherum 



Achmodoton 



Aegialina 



Aegialiiis 



Aegopogon 



Agraulus 



Agropyron 309, 



Kt- y to the Species of 



c-aninum. /. 22.1. m. 312 315, 



occidentals /. 825. m. 324 315, 



var. Molle. /. 22>t. m. 324.315 

 pseudo-repena. /. 227. m. 324... 315, 



repens. f.SZB. m. 324 315, 



Richardsoni. /. :.'2. m. 312 



tenerum. /. .'.'4. m. 312 3 5, 



Agropyron . 



caninum 



n pens var. tenerum 



Spicatum 



Agropyrum. 



unitaterate 315 



violesccns 315 



caninum 316, 317 



caninoides 317 



epicatum 3W 



Agrosticula 155 



AgrostidEvE 4,5,113,194 



Key to the Genera of 113 



Agrostis.... 114, 168 



Key to the Species of 168 



alba. /. SI, 120. m. 166 16:4,169 



intermedia. f.ISS 168, 174 



perennans. /. 121. m. 166 . 168, 170 



s.-abra. f.lZS. m. 166 16^, 172 



Agrostis. 



brevifolius 160 



Cinna 164 



iryptandra 161 



diffusa 140 



flli/ormis 13} 



hyrmalis 172 



lateriflora 133 



Mezicana 133 



pauciflora 138 



perennans 170 



raeemosa 134 



Boboliffra 132 



tenut flora 138 



trichodium ... 169 



vulgaris 169 



A ira 



Cristata 



obtusata 



purpurea 



. i irochloa — 



Ajlltrghaiiian Area 



Alopecurus 114, 



Key to the Species of 



geniculatus. /. 10S. m. 153 



pratensis. /. 110. m. 153 151, 



Alopecurus. 



iinstulatiix 



geniculatus var. aristulatus 



" var. fulvus 



Altitude 



A inmophila 



Andropogon 



Key to t he Species of 



Halepensis. /. 15. m. 39 



Hallii. /. 21. m. 39 



nutans. f.2l t . m. 39 



provincialis. /. 22. m. 39 



scoparius. /. 20. m. 39 



Sorghum. J .16 



Tennesseensis. /. SS. m. 39 



Andropogon. 



avenaceus 



furcalm 



nutans avenaceus 



provincialis var. Tennesseensis.. 



Sorghum Halepensis 



' ' var. Durra 



" var. t-alivus 



vulgare 



Andropogone.*. /. 15 



Key to the Genera of 



Anisantha 



Anthoxanthum 



odoratum. ./'. 7S 



var. puelii. /. 79. m. 



. I nthosaehne 



Arid Transition 



A) ixtella 



Aristida 



Key to the Species of 



basiramea. /. 8S. m. 104 



dichotoma. f. 82. m. 104 



gracilis. /. S8. m. 127 



intermedia. /. 87. m. 127 



longiseta. /. Si, 90 



" var. robusta. f.85. m. 104. 



oligantha. f. 86. ra. 104 



3, 5, 



106, 



L04. 



113, 



115, 



115. 

 .115, 



.115, 

 115, 

 115, 



222 

 238 

 221 

 222 

 389 

 150 

 151 

 151 

 154 



151 



151 



151 



382 



181 



22 



26 



36 



29 



34 



30 



27 



38 



32 



34 



30 



34 



32 



36 



38 



38 



38 



22 



22 



284 



109 



109 



no 



3!4 

 389 

 124 

 114 

 115 

 116 

 115 

 122 

 121 

 118 

 119 

 119 



