Pale evening primrose . 24
Pale evening primrose. 23
Pale smartweed. 274
Paperflower. 128
Paronychia jamesii. 262
Penstemon albidus. 230
Penstemon ambiguus var. ambiguus. 229
Physalis hederiefolia. 93
Physalis longifolia. 94
Phytolacca americana. 46
Pincushion cactus. 121
Pitcher's salvia. 235
Plains blackfoot. 131
Plains chinese-lantern . 90
Plains coreopsis. 157
Plains daisy. 169
Plains hymenoxys. 127
Plains larkspur. 225
Plains milkweed. 106
Plains yellow evening primrose . 20
Plantago patagonica. 266
Plantago rhodosperma. 265
Pluchea odorata. 187
Plume dalea. 213
Poison ivy. 270
Pokeweed, Pokeberry. 46
Polanisia dodecandra. 8
Polygala alba. 268
Polygonum lapathifolium. 274
Potamogeton nodosus. 269
Prairie groundcherry . 93
Prairie groundsel. 126
Prairie spiderwort . 1
Prairie sunflower. 155
Prairie turnip. 207
Prickly lettuce. 179
Prickly sowthistle. 178
Proboscidea louisianica. 234
Psilostrophe villosa. 128
Psoralea cuspidata. 209
Psoralea esculenta. 207
Psoralea lanceolata. 201
Psoralea tenuiflora var. tenuiflora. 203
Puncture vine. 49
Purple ammania. 39
Purple poppy mallow. 58
Purple prairie clover. 281
Pyrrhopappus grandiflorus. 176