4-N 



INDEX. 



Aristida— Continued. 



tuberculosa, f. 89,30. m. 127 ....115, 123 

 Aristida. 



Intermediate. /. 87 121 



Large Purple. /. 85 119 



Purple. /. 84 118 



Slender. /. 88 122 



Aristida. 



dichotoma var. Curtisii 115 



jasciculata 118 



gracilis var. depauperala 122 



Arkansas Wild Rye. /. 2ii 345 



Arrhenatherum 184, 190 



avenaceum. /. 129,135. m. 187... 183, 191 



Arrhenatherum elatiut 191 



Arundinella 42 



Nepalensis. /. SO 42 



Arundo .... ' 215, 267 



agrosioides 177 



Canadensis 177 



festucacea 268 



Phragmites ... 216 



vulgaris 216 



Asprella 309,353 



Hystrix. f. 152. m. 354 354 



Asprella. 



oryzoides 100 



Virginica 99 



Atheropogon 204 



apludioides 205 



oligostachya 206 



Atmospheric Factor 390 



Avena 184, 185 



Key to the Species of 186 



fatua. f. 133. m. 187 186 



longiglumis. /. 1SU m. 187 186, 189 



sativa. /. 132. m. 187 .186 



Avena 191 



barbata 188 



elatior 181 



spicata 192 



AvEXE.-t: 4, 5, 183, 194 



Key to the Genera of 184 



Awn Grass, Tufted Triple, f. 83 117 



Awned Wheat Grass. /. .'.'.; 31 



Awnless Terrell Grass. /. til ... 342 



Ball's Slender Lyme Grass. /. 2i6 347 



BambusEvE 4, 6, 355 



Baldingera 106 



Barley : 



Four-rowed. / 331 



Little. /. 939 339 



Meadow. /. 2.:6 335 



Hammers Wild. /. 237 335 



Two-rowed. f. 233, 23i 330 



Wild. /. 238 335 



Barnyard Grass. /. 36 50 



Awnless. f. SI 52 



Beckmarmia 194 



eruca?formis . /. l.',0. m . 203 197 



Beckmannia er ucoej or mis var.uraf flora 197 

 Bent Grass, Upland. /. 123 174 



Bermuda Grass . f. 139 196 



Bibliography 409 



Biotic Factor .. . . 390,391 



Black-fruited Mountain Rice. /. 103 , . . 143 

 Blue Grass: 



Kentucky, f. 185 265 



Texas. /. 186 267 



Blue Joint. /. 1 .'5 177 



Blue Stem. /. :2 30 



Colorado. /. t2B 319 



Little, f. 20 27 



Tennessee. /. 23 33 



•Blunt-scaled Eatonia. /. 166 238 



Blyttia 163 



suaveolens 164 



Bog Reed Grass, f. 127 180 



Bottle-b; ush Grass, f. 252 354 



Bouteloua 195, 204 



Key to the Species of 204 



curtipendula. /. 1!,U. m.203... 204, 205 



hirsuta. f. US. m. 203 204,208 



oligostachya. /. US. m. 203 204, 206 



Bouteloua racemosa 205 



Brachyelytrum 114, 146 



erectum. /. 106. m. 139 147 



Brachyelytrum. /. 106 147 



Brachyelytrum aristatum 147 



var. Engelmanni 147 



Briza 213, 251 



media. /. 175 251 



Broad-glumed Brome Grass. /. 201 289 



Broad-leaved Spike Grass. /. 172 247 



Brome Grass. /. 199 287 



Broad-glumed. /. tOl 289 



Corn. f. 216 306 



Downy. /. 205 293 



Field, f. 215 305 



Fringed, f. 203 290 



Hungarian. /. 198 285 



Kalm's. f. 206 295 



Keeled, f. 212 300 



Smooth, f. 198 285 



Smooth-glumed Fringed. /. 20U 293 



Spreading, f. 217 307. 



Wood. f. 200 288 



Bromus 214,284 



Key to the Species of 284 



arvensis. /. .'7.5 m. 301 285, 305 



carinatus f. 212. m. 301 285, 300 



cilia us. / :03. m 291 284, 290 



" var. la-viglumis. f.20U m.291. 2S4, 293 



hordeaceum /. 807. m. 301 285, 295 



•• var. glabrescens. f.20S. m.301. 285, 297 



inermis. /. 198. m. 2yi 284, 285 



Kalmii. /. '.06. m. 291 284, 295 



marginatum /. 209. m. 301 285, 297 



" var. latior. /. 210. m. 301. 285, 300 



patulu<. I. .'17. m. 312 285, 307 



purgans. /. 199. m. 291 284, 287 



" var. incanus. /. 200. m.291. 284, 288 

 " var. latiglumis. f 201. m. 291.284,289 



