INDEX. 
443 
Prickly Poppy, 148 
Primrose, 261 
Primrose Family, 261 
Primula, 261 
Primulace^:, 261 
Primulales, 261 
Prionopsis, 345 
Prosartes, 84 
Prunella, 297 
Prunus, 193 
Pseudocymopterus, 256 
Pseudotsuga, 8 
Psilostrophe, 376 
Psoralea, 213 
Psoralen 
Ptelea, 221 
Pteridium, 3 
Pteridophyta, 1 
Pteris, 3 
Pterospora, 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 
Purs hi a, 189 
Purslane, 126 
Purslane Family, 125 
Pussley, 126 
Pyrola, 259 
Pyrolace.®, 258 
Pyrrocoma, 344 
Pyrus, 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^:, 134 
Ranunculus, 142, 146 
Raspberry, 180 
Raspberry, Flowering, 180 
Ratibida, 372 
Rattle-snake Plantain, 89 
Rattlesnake-root, 404 
Razoumofskya, 100 
Red Cedars, 9 
Reddeldia, 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, 176 
Rib-grass ( Plantago ) 
Rice Cut-grass, 22 
Rice, Mountain, 25 
Riddellia, 376 
Rhamnales, 227 
Rhamnus, 227 
Rhinanthace^;, 304 
Rhinanthus, 319 
Rhodiola, 170 
Rhus, 225, 226 
Robinia, 202 
Rock-brake, 4 
Rock-cress, 164 
Rock Rose ( Pachylophus ) 
Rock-rose Family, 232 
Rocky Mountain Red Cedar, 10 
Rocky Mountain White Pine, 8 
Rocky Mountain Yellow Pine, 7 
Roripa, 155 
Rosa, 190 
Rosacea, 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 
Rubus, 180 
Rudbeckia, 371 
Rue Family, 221 
Rulac, 227 
Rumex, 107 
Running Pine, 6 
Rush Family, 77 
Rushes, 77 
Russian Thistle, 120 
Rutace^e, 221 
Rydbergia, 380 
Rye, Wild, 56 
Rye-grass, 57 
Sabina, 9 
Sage, 298 
Sage, White, 118 
Sage, Winter, 118 
