INDEX. 



443 



Prickly Poppy, 148 



Primrose, 261 



Primrose Family, 261 



Primula, 261 



PRIMULACE^E, 261 



PRIMULALES, 261 



Prionopsis, 345 



Prosartes, 84 



Prunella, 297 



Primus, 193 



Pseudocymopterus, 256 



Pseudotsuga, 8 



Psilostrophe, 376 



Psoralea, 213 



PSORALE^: 



Ptelea, 221 



Pteridium, 3 



PTERIDOPHYTA, i 



Pteris, 3 



Ptcrospora, 258 



Pteryxia, 254 



Ptilocalais, 403 



Ptiloria, 403 



Puccinellia, 48 



Puccoon, 292 



Pulsatilla, 140 



Pumpkin, 325 



Purple Cone-flower, 371 . 



Purple Ground-cherry, 302 



Purple Virgin's Bower, 141 



Purshia, 189 



Purslane, 126 



Purslane Family, 125 



Pussley, 126 



Pyrola, 259 



PYROLACE^E, 258 



Pyrrocoma, 344 



Pynis, 193 



Quack-grass, 52 

 Quaking-grass, 40 

 Quamoclidion, 123 

 Quercus, 97 

 Quillwort, 5 

 Quillwort Family, 5 

 Quincula, 302 



Rabbit-brush, 340 

 Rag-weed, 328 

 Rag-weed Family, 327 

 Ram's-horn, 320 

 RANALES, 134 

 RANUNCULACE^E, 134 

 Ranunculus, 142, 146 

 Raspberry, 180 

 Raspberry, Flowering, 180 

 Ratibida, 372 

 Rattle-snake Plantain, 89 

 Rattlesnake-root, 404 

 Rasoumofskya, 100 



Red Cedars, 9 



Redfieldia, 38 



Red Fir, 8 



Red Orpine, 170 



Red-top, 30 



Red Willow (Svida) 



Reed, 37 



Reed-grass, 31, 32 



Reed-grass, Wood, 30 



Reed Meadow-grass, 48 



Resin-weed, 338 



Ribes, 1 76 



Rib-grass (Planiago) 



Rice Cut-grass, 22 



Rice, Mountain, 25 



Riddellia, 376 



RHAMNALES, 227 



Rhamnus, 227 



RHINANTHACE^E, 304 



Rhinanthus, 319 



Rhodiola, 1 70 



Rhus, 225, 226 



Robinia, 202 



Rock-brake, 4 



Rock-cress, 164 



Rock Rose (Pachylophits) 



Rock-rose Family, 232 



Rocky Mountain Red Cedar, 10 



Rocky Mountain White Pine, 8 



Rocky Mountain Yellow Pine, 7 



Roripa, 155 



Rosa, 190 



ROSACE^E, 178 



ROSALES, 169 



Rose, 190 



Rose Family, 178 



Rose-root, 170 



Rose-wort, 170 



Rubacer, 180 



Rubber Plant, Colorado, 380 



RUBIACE.E, 321 



RUBIALES, 321 



Ritbus, 180 



Rudbeckia, 371 



Rue Family, 221 



Rulac, 227 



Rnnic.v, 107 



Running Pine, 6 



Rush Family, 77 



Rushes, 77 



Russian Thistle, 120 



RUTACE,, 221 



Rydbergia, 380 

 Rye, Wild, 56 

 Rye-grass, 57 



% 



Sabina, g 



Sage, 298 



Sage, White, 118 



Sage, Winter, 118 



