384 



INDEX. 



Peramium ophioides 210 



Peraphyllum 180, 181, 183, 185, 186, 187 



ramosissimum 182, 185 

 Petalostemon 50, 95, 106, 107, 128, 281 



candidus 39, 120, 127, 128, 129, 130, 148, 299 

 purpureus 39, 120, 127, 128, 130, 148, 299 

 Petasites 58 

 Peucedanum 61 

 Phacelia alpina 234 

 crenulata 176, 303 

 distans 176, 303 

 heterophylla 302, 304 

 hydrophylloides 228 

 lyallii 234 



ramosissima 193, 214 

 sericea 234, 236 

 Phalaris caroliniana 176 

 Phaseolus 28, 86 

 vulgaris 27, 79 

 Philadelphia 181, 185, 186, 187, 191 



gordonianus 178, 182, 185 

 Philibertella hartwegii heterophylla 176 

 Philotria 86 

 Phippsia 230 

 Phleum alpinum 288 



pratense 288 

 Phlox condensata 234, 236 

 pilosa 130, 138 

 speciosa 152 

 Phragmites 39, 50, 60, 101, 102 



communis 110, 288 

 Physalis angulata linkiana 176 



lobata 302 

 Physaria didymocarpa 199 

 Picea205, 215, 217, 218, 222, 223, 224, 225, 226, 

 228 

 breweriana 211 



engelmanni 46, 80, 209, 215, 216, 219, 220, 

 221, 222, 223, 224, 225, 227, 228, 348 

 mariana 216 

 pungens 208, 209, 210 

 sitchensis 214, 216, 217, 218, 219 

 Pinus 193, 194, 195, 196, 197, 198, 201, 202, 

 205, 207, 211, 216, 219, 220, 221 

 aristata 222, 224, 225, 226 



balfouriana 224, 227, 228 

 arizonica 205, 208, 209 

 attenuata 93, 211, 212, 213, 283, 353, 354 

 cembroides 196, 200, 203, 204 

 chihuahuana 205, 208 



contorta93, 205, 207, 208, 209, 210, 215, 216, 

 219, 220, 221, 222, 223, 225, 227, 228, 

 283, 353 

 coulteri 211, 213 

 divaricata 93, 216 

 edulis 195, 196, 198, 199, 200, 201 



monophylla 196, 197, 198, 200, 202, 203, 



204 

 quadrifolia 196, 200, 203, 204 

 flexilis 205, 207, 208, 210, 222, 224, 225, 226, 

 227, 228 

 albicaulis 205, 207, 208, 224, 225, 227, 228 

 lambertiana 211, 212, 213 

 monticola 215, 216, 219, 220, 221, 223, 227, 



228 

 ponderosa 17, 25, 45, 184, 197, 204, 205, 207, 

 208, 209, 210, 211, 212, 213, 215, 216, 

 219, 220, 221, 346, 348, 350, 351 

 jeffreyi 211, 212, 213, 223 

 sabiniana 196, 202, 203, 204 



Pinus — continued. 



scopulorum 205 



strobiformis 208 

 Pirola 109 



chlorantha 210 



minor 226 



picta 214, 219, 221 



secunda 210 



uliginosa 210 

 Pirus diversifolia 219 



sitchensis 221 

 Pistia 61 



Pisum arvense 42 

 Plagiobothrys arizonicus 176, 303 

 Plantago 60, 324 



elata 148 



fastigiata 176, 302, 303 



ignota 176 



major 58 



patagonica 283, 302, 304 

 Poa 61, 151, 230, 232, 282, 283, 303 



alpicola 232 



alpina 232, 235 



arctica 232, 235, 288 



arida 288 



compressa 288 



crocata 232 



cusickii 235 



epilis 232 



grayana 232 



lettermani 232, 233 



nemoralis 288 



nevadensis 288 



paddensis 235 



pattersoni 232 



pratensis 133, 134, 190, 226, 282, 288 



rupicola 232, 235, 288, 361 



sandbergii 288, 292 



saxatilis 235 



suksdorfii 235 



tenuifolia 150, 288 

 Poaceae 162, 230 

 Podostemaceae 61 

 Polemonium confertum 234 



pulchellum 226, 234 



viscosum 234 

 Polygala alba 202, 299 



californica 193 

 Polygonaceae 152 

 Polygonatum 59, 60 

 Polygonum 25 



aviculare 283, 290, 302 



bistorta 234 



convolvulus 187 



davisiae 228 



douglasii 187 



erectum 290 



pennsylvanicum 94 



ramosissimum 290, 302 



viviparum 234, 236 

 Polypogon monspeliensis 176, 288, 304 

 Polytrichum 61 



Polystichum munitum 214, 219 

 Populus 92, 110, 172 



tremuloides 25, 92, 110, 205, 209, 223, 225, 

 361 

 Portulaca oleracea 283, 303, 361 

 Potamogeton 27, 59, 61, 110 

 Potentilla anserina 60 



arguta 160, 187, 190, 



