434 



INDEX. 



Pennisetum 



verticillatum 



Pentameris 



Perennial Rye Grass, f. 218 



Phalaride^ 4,5, 



Key to the Genera of 



Phalaris 



Key to the speciea of 



arundinacea. /. :.'>, 77. m. 104 106, 



Canadensis. f.76. m. 104 106, 



Phalaris 



mtricfiirmis 



oryzoides 



Phleum 114, 



pratense. f. Iff}, m.153 



Phragrmites 213, 



communis, f. 152. m. 220 



Pli ragm ite* 



Phragmites 



vulgaris 



Physiography ... 



Pigeon Grass f.62 



Piptatherum 



Piptochaetium 



Plume Grass. /. 17 



Poa 212, 213, 



Key to the Species of 



annua. /. 176. m.249 



arachnifera. /. 186. m. 264. . . .213. 253, 



Lhapmaniana. /. 177. m.249 253, 



compressa. f. 178. m.249 253, 



debilis. f. 179. m 249 253, 



flava. i. 183 253, 



nemoralis. /. 182. m. 264 253. 



pratensis. f. 183. m.264 253, 



trivialis. f. ISO. m.264 253, 



Wolfll. f. 181. m.264 253, 



I'oa 



wi uatica var. A mericana 



cassia var. strietior 



ca pillar is 



Caroliniana 



crista ta 



nerval'i 



liypnoirf.es 



pratensis var. angustifolia 



serotina 



seslerinirfes 



tenuis 



POACE^E 



Key to the Tribes of 



Pod Corn. f.S 



Podosoem um 



Poidium 



Poison Darnel, f. 221 



Polyntherix 



Polypogon glomeratus 



Ponceletia 



Pop Corn. f. 3,7. 12 



Porcupine Gra^s. /. 96 



Porroteranthe 



83 

 84 

 192 

 310 

 105 

 106 

 106 

 106 

 108 

 107 



197 

 100 

 148 

 148 

 215 

 210 

 216 

 216 

 216 

 361 



86 

 142 

 142 



21 



253 



253 

 267 

 255 

 255 

 257 

 262 

 261 



258 

 259 

 224 

 271 

 261 

 221 

 231 

 255 

 270 

 225 

 263 

 2(2 

 219 

 226 

 3 

 4 

 9 

 130 

 252 

 314 

 340 

 134 

 199 

 9 

 129 

 269 



169, 



Poverty Grass. /. 82 



Long-awned. /. 89, no 



Praiiie Rush Grass. /. 11!,... 

 Praitie Triple Awn. f. 86 . 



Prairie Xerophytes , 



Precipitation Data for Iowa . . 



Pre-Kansan Drift 



Psamma 



Pseudopoa 



Pi ilagroslix 



Purple Aristida. /. Si 



Quack Grass. /. 228 ... 



Quaking Grass. /. i,*.» 



Reboulea 



Red Fescue Grass. /. I'.U . .. . 

 Red Top. /. 120, 125 



Sharp-pointed. /. 126 



Tall. /. 158 



Reed. /. 152 



Reed Bent, Macoun's. /'. 126 



Reed Canary Grass. /. 77 



Reed Grass . 



Bog. /. 127 



Indian. /. 117 



Long-leaved. /. 128 



Slender, f. 119 



Reed Meadow Grass, f. 189 



Relchela 



Rhombolytrum 



Rice-cut Grass, f.'il 



Rice. 



Wild, f.69 



Black-fruited Mountain. /. 103 



Richardson's Wheat Grass. /. 222 



Robust Lyme Grass . f.251 



Rock Muhlenbergia. f. 95 



Rook Series, The 



Roegneria 



Rottboellia paniculata 



Rough-stalked Meadow Grass. /. 180... 

 Rush Grass: 



Long-leaved. /. ill 



Prairie, f. 114 



Sand. /. 115 



Sheathed, f. 112 



Small. /. 113.. 



Rye. f. 230 



Rye Grass: 



Italian. /. 219 



perennial . /. 218 



short-spiked. /. 249 



Saccharum 



officii! arum. /. 18 



Sa t Marsh Cock-spur Grass. /. 38 



Sandbur. f. 66 



Sand Grass, f. 155 



Sand Rush Grass. /. 115 



Savastana 



odorata 



Schedonnardus 194, 



paniculatus. / 142. m. 203 



116 

 123 

 160 

 120 

 394 

 386 

 372 

 181 

 252 

 124 

 118 

 323 

 251 

 237 

 279 

 177 

 179 

 219 

 216 

 176 

 108 



180 

 165 



182 

 167 

 272 

 175 

 218 

 100 



97 

 143 

 315 

 352 

 132 

 368 

 314 

 202 

 259 



157 

 160 

 161 

 158 

 159 

 325 



311 



310 



350 



22 



25 



53 



92 



221 



161 



111 



112 



201 



201 



