INDEX. 277 
Picea, 50, 51 
Pikea, 68 
Pine, Knob-cone, 229, 230; Loiseleur, 227; Monterey, 224, 231; Sugar, 163 
Pinus, 97, 123, 124, 134-136, 163, 164, 176, 225-231 
Pistia, 218 
Pittonia, as to the continuance of, 27 
Physalis, 98 
Physalospora, 198 
Plagiobothrys, 94, 177 
Plane tree, 242 
Plantago, 23, 99, 102, 108, 243 
Plant dispersion by the buffalo, 19, 47, 144 
Plant names, a new fashion in writing, 138 
Platanus, 242 
Pogogyne, 16, 245 
Poison Oak, 159 
Polanisia, 233, 234 
Polygonum, 14, 83, 99, 102, 243, 244 
Polypodium, 113, 216, 247 
Polypogon, 97. 
Portulaca, 30, 58, 242 
Portulaces, rearrangement of American, 29 
Postelsia, 67 
Potentilla, 5, 10, 13, 82 
Pre-Linnzan binominals, 42 
Primula, 252, 255, 257 
Prionitis, 64, 
Pseudotsuga, 48, 49, 50, 51 
Pseudovalsa, 1 
Pseva, 
Psilopezia, 200 
Psoralea, 13, 80, 168, 169, 243 
Ptiloria, 92, 175 
Ptilota, 67, 
Puccinia, 204, 249-251, 252 
Pulsatilla, 4 
