Opium, Wild, 542 
Opuntia fragilis, 287 
humifusa, 288 
Rafinesque, 288 
Orache, Spreading, 114 
Orobanche ludoviciana, 390 
minor, 389 
ramosa, 387 
Orpine, Biting, 200 
Common, 202 
Owl’s Crown, 441 
Oxalis corniculata, 256 
stricta, 255 
Ox-tongue, Bristly, 531 
Oxwort, 502 
Ozybaphus hirsutus, 130 
linearis, 131 
nyctagineus, 129 
Oxytropis Lamberti, 241 
Oyster, Vegetable, 533 
Painted Leaf, 270 
Panicum capillare, 28 
crus-galli, 30 
dichotomiflorum, 29 
proliferum, 29 
virgatum, 30 
Papaver dubium, 171 
Rheas, 170 
Parsley, Dog’s, 303 
False, 303 
Fool’s, 303 
Spotted, 300 
Parsnip, Cow, 306 
Field, 305 
Meadow, 304 
Wild, 305 
Woolly, 306 
Parsonia petiolata, 291 
Passiflora incarnata, 287 
Passion-flower, 287 
Passion-vine, 287 
Pastinaca sativa, 305 
Paul’s Betony, 360, 383 
Pea, 222, 225 
Blue, 228, 229 
Everlasting, 250 
Hoary, 238 
Large-flowered Sensitive, 221 
Meadow, 252 
Partridge, 221 
Tuberous Wild, 250 
INDEX 
Pea, — Continued 
Turkey, 238 
Peas, Cat, 247 
Craw, 252 
Mouse, 252 
Pellitory, Wild, 487 
Pennyroyal, American, 358 
Bastard, 358 
Mock, 358 
Pentstemon levigatus, 381 
Pepper, Bird’s, 176 
Poor Man’s, 178 
Wall, 200 
Peppergrass, Common, 176 
Field, 178 
Green-flowered, 178 
Peppermint, 361 
Persicary, Glandular, 100 
Peach-leaved, 102 
Petasites palmatus, 502 
vulgatus, 502 
Phalaris canariensis, 37 
Physalis ixocarpa, 369 
lanceolata, 371 
pubescens, 370 
virginiana, 371 
Phytolacca decandra, 128 
Pick-purse, 136 
Picris, Bugloss, 531 
Picris echaides, 531 
Pieris mariana, 310 
Pigweed, Matted, 123 
Prostrate, 123 
Redroot, 120 
Rough, 120 
Russian, 119 
Smooth, 112 
Tumbling, 122 
White, 122 
Winged, 106 
Pilewort, 380, 503 
Pimpernel, Scarlet, 311 
Pine, Meadow, 20 
Pinetop, 20 
Pink, Hedge, 149 
Meadow, 148 
Mullein, 142 
Plant, Compass, 447, 540 
Cruel, 270 
Cup, 449 
Enchanter’s, 343 
Fever, 295 
585 
