1218 



Index 



PAGE 



zosterfolius 80 



zosteriformis 81 



Potamogetonaceae 75 



Prairieclover, purple 600 



white 600 



Prenanthes 1014 



alba 1015 



altissima 1014 



aspera 1015 



crepidinea 1016 



racemosa 1015 



serpentaria 1106 



trifoliolata 1015 



Primrose-willow 700 



floating 700 



Primulaceae 744 



Princes-plume 416 



Privet, European 1080 



Proserpinaca 711 



palustris 1078 



palustris 712 



palustris var. crebra 712 



palustris var. amblyogona 712 



Prunella 808 



vulgaris 808 



vulgaris var. lanceolata 808 



vulgaris var. minor 808 



vulgaris var. nana 808 



Prunus 578 



americana 579 



angustifolia 580 



angustifolia var. Watsoni 1064 



Cerasus 1064 



cuneata 580, 1064 



hortulana 581 



lanata 579 



Mahaleb 582 



nigra 580 



pennsylvanica 581 



Persica 1064 



pumila 579 



sorotina 582 



susquefianac 580, 1064 



virginiana 581 



virginiana var. demissa 581 



Psedera quinque folia 664 



vitacea 665 



Psilocarya 207 



nitens 207 



scirpoides 207 



Psoralea 597 



few-flower 597 



Onobrychis 598 



pedunculata 598 



psoralioides var. eglandulosa 598 



sainfoin 598 



PAGE 



stipulata 598 



tenuiflora 597 



Ptelea 632 



mesochora 632 



trifoliata 632 



trifoliata var. Deamiana 632 



trifoliata var. mollis 1070 



trifoliata f. pubescens 632 



Pteretis 44 



nodulosa 44 



nodulosa f. pubescens 45 



Pteridium 57 



aquilinum 57 



latiusculum 57 



Pteridophyta 25, 37 



Pteris aquilina 57 



Puccoon 793 



Pumpkins 892 



Purslane, common 435 



marsh 701 



water 697 



Pussytoes 951, 952, 953 



Parlin 952 



plantain-leaf 952 



single-head 952 



Puttyroot 351 



Pycnanthemum 819 



clinopodioides 1086 



flexuosum 820 



incanum 1086 



muticum 1086 



pilosum 820 



pycnanthemoides 819 



virginianum 820 



Pyrola 735 



americana 736 



asarifolia 1079 



asarifolia var. incarnata 736 



chlorantha 736 



elliptica 736 



rotundifolia var. americana 736 



roundleaf 736 



secunda 735 



Pyroloideae 733 



Pyrrhopappus 1013 



carolinianus 1013 



Pyrus 528 



arbutifolia var. atropurpurea .... 530 



communis 1058 



melanocarpa 530 



Q 



Quackgrass 114 



Quamasia hyacinthina 315 



Quamoclit 777 



coccinea 777 



