9U 



INDEX 



Poison Ivy 552 



Oak 552. 553 



Sumach 552 



Poke, Common 374 



Milkweed 665 



Pokeweed 374 



Family 374 



Polanisia 43S 



graveolens 438 



trachysperma 438 



POLEMONIACEAE 673 



Polemonium 676 



coeruleum 676 



Family 673 



reptans 676 



Van Bruntiae 676 



Polycodium candi- 



cana 639 



melanocarpum 639 



neglectum 639 



stamineum 639 



Polygala 53S 



ambigua 540 



brevifolia 540 



cruciata 539 



Curtissii 539 



cymosa 540 



fastigiata 539 



Fringed 538 



incarnata 539 



lutea 540 



mariana 539 



Nuttallii 539 



pauciflora 538 



pKjIygama 539 



ramosa 540 



sanguinea 539 



Senega 539 



verticillata 540 



viridescens 539 



POLYGALACEAE 538 



POLYGONACEAE 353 



Polygonatum 292 



biflorum 292 



boreale 292 



commutatum 292 



cuneatum 292 



ffiganteum 292 



virginicum 292 



Polygonella 363 



americana 363 



articulata 363 



ericoidea 364 



Polygonum 357 



acre 36 1 



amphibium 360 



ari folium 362 



aviculare 358 



camporum 359 



Careyi 361 



cilinode 362 



Convolvulus 362 



criatatum 363 



cuspidatum 363 



densiflorum 360 



Douglasii 359 



dumetorum 363 



emeraum 361 



tomentosum 360 



virginianum 362 



v-iviparum 359 



Zuccarinii 363 



Polymnia 824 



canadensis 824 



uvedaUa 824 



POLYPODIACEAE 33 



Polypodium 34 



incanum 34 



polypodioides 34 



vulgare 34 



Polypody 34 



Polypogon 133 



monspeliensis 133 



Polypremum 653 



procumbens 654 



Polypteris 843 



callosa 844 



Polystichum 40 



acrostichoides 40 



Braunii 41 



Lonchitis 40 



Polytaenia 620 



Nuttallii 620 



Pomme blanche 512 



Pommede Prairie 512 



Pond Pine 64 



Spice 414 



Pond weed 70 



Family 69 



Horn 78 



Pontederia 266 



cordata 266 



PONTEDERIACEAE 



266 

 Poor Man's Weather- 

 glass 647 

 Robin's Plantain 

 873 



Poplar 323, 409 



Balsam 329 



Black 329 



Downy 329 



Lombardy 329 



Necklace 329 



Silver-leaved 328 



White 328 



Poppy 416 



Celandine 415 



Common 416 



Corn 416 



Family 414 



Horn 415 



Mallow 568 



Mexican 416 



Plume 415 



Prickly 416 



Sea 415 



Populus 328 



alba 328 



balsamifera 329 



candicans 329 



deltoides 329 



grandidentata 328 



heterophylla 329 



monilifera 329 



nigra 329 



tremuloides 328 



Porcupine Grass 124 



Porteranthus 457 



stipulatus 457 



Portulaca 389 



neglecta 389 



oleracea 389 



pilosa 389 



retusa 389 



PORTULACACKAE 387 



Post Oak 339 



Potamogeton 70 



acutifolius 75 



alpinus 72 



americanus 73 



amplifolius 73 



angustifolius 74 



bupleuroides 75 



confervoides 77 



crispus 75 



dimorphus 77 



diveraifolius 77 



epihydrus 72 



Faxoni 73 



filiformis 77 



fiuilana 73 



foliosus 77 



Friesii 75 



gemmiparus 76 



heterophyllus 73 



Hillii 75 



hybridus 77 



illinoensis 73 



interior 77 



interruptus 78 



lateralis 76 



lonchitea 73 



lucens 74 



marinua 77 



miLcronatua 75 



