Posidoniaceae, 1 29 

 Possum-grape, 1112 

 Possum-haw, 1099, 1556 

 Post-oak, bottomland-, 785 

 Post-oak, swamp-, 784 

 Potamogeton, 3, 4, 5, 7, 9, 

 10, 95, 126 



alpinus, 117 



americanus, 114 



amplifolius. 111, 117 



angustifolius, 114 



Berchtoldii 

 tenuissimus, 106 



clystocarpus, 105 



crispus, 103 



diversifolius 



diversifolius, 108 

 trichophyllus, 108 



filiformis, 100 



foliosus, 103 

 foliosus, 105 

 macellus, 105 



gramineus, 114 



illinoensis, 114 



latifolius, 100 



lucens, 1 14 



natans, 117 



nodosus, 7, 111, 114 



pectinatus, 95, 100 



pulcher, 108 



pusillus, 105 



Potamogetonaceae, 95, 129 

 Potato, 1449 

 -bean, 1069 



American-, 1069 

 family, 1449 

 hog-, 1045 

 sweet-, 1354 

 wild-, 1357 

 Potentilla, 1021 

 Anserina, 1031 



concolor, 1031 

 arguta 



Convallaria, 1029 

 atrorubens, 1025 

 biennis, 1027 

 diversifolia, 1028 

 filipes, 1028 

 fruticosa, 1025 

 glandulosa, 1029 



arizonica, 1029 

 gracilis, 1028 



brunnescens, 1028 



grabrata, 1029 



pulcherrima, 1028 

 Macdougalii, 1029 

 monspeliensis, 1025 

 norvegica, 1025 



hirsuta, 1025 

 paradoxa, 1027 



pentandra, 1025 

 plattensis, 1029 

 pulcherrima, 1028 

 rivalis, 1027 

 Thurberi, 1025 

 atrorubens, 1025 

 Thurberi, 1025 

 Powderpuff, 1042 

 Powdery-thalia, 686 

 Prairie 



-agalinis, 1497 

 -buttercup, 939 

 -cordgrass, 265 

 -cupgrass, 285 

 -dogbane, 1337 

 -mallow, 1114 

 -wedgescale, 218 

 Pretty dodder, 1367 

 Prickly lettuce, 1698 

 Primrose, 1287 

 evening-, 1194 

 family, 1276 

 spotted-, 1197 

 water-, 1175, 1187 

 -willow, 1178 

 creeping-, 1187 

 floating-, 1187 

 Primula, 1287 

 angustifolia, 1287 

 Ellisiae, 1288 

 Parryi, 1288 

 Rusbyi, 1288 

 Primulaceae, 1276 

 Princess-feather, 826 

 Privet, swampH, 1307 

 Proboscidea, 1510 

 Jussieui, 1510 

 louisianica, 1510 

 Proserpinaca, 7, 1201 

 palustris, 1201 

 amblyogona, 1201 

 creba, 1201 

 pectinata, 1201 

 Prostrate vervain, 1400 

 Prunella, 1419 

 vulgaris, 1419 

 hispida, 1422 

 lanceolata, 1422 

 Psilactis, 1609 

 aster aides, 1610 

 Coulteri, 1610 

 lepta, 1610 

 Psilocarya, 489 



nitens, 489 

 Psilotaceae, 37 

 Psilotum, 37 

 nudum, 37 

 Pteridophyta, 17, 37 

 Ptilimnium, 1243 

 capillaceum, 1243 



costatum, 1243 



Nuttallii, 1243 



texense, 1243 

 Puccinellia, 179 



airoides, 181 



distans, 181 



Nuttalliana, 181 



Parishii, 181 



pauci flora, 185 

 Pull-up muhly, 248 

 Purple 



-beautyberry, 1395 



-bladderwort, 1519 



-cudweed, 1632 



-dewdrop, 1580 



-loco, 1062 



-meadow-rue, 958 



-milkweed, 1341 



-rocket, 964 



-wen-dock, 909 

 Purslane, 881, 884 



family, 879 



horse-, 875 



lowland-, 879 



marsh-, 1187 



sea-, 875 



speedwell-, 1491 



water-, 1162 

 Pycnanthemum, 1446 



albescens, 1448 



flexuosum, 1448 



tenuifolium, 1446 



virginianum, 1448 

 Pycreus, 416 

 Pyrus, 1017 



arbutifolia, 1017 



Quackgrass, 210 

 Quail-brush, 850 

 Quaking 

 -aspen, 751 



-grass, 192 



-grass, little, 192 

 Quamasia hyacinthina, 657 

 Quamoclit, 1 354 



coccinea, 1355 



hederi folia, 1355 

 Quelite, 855, 862 



espinoso, 861 



salado, 847 

 Quercus, 734, 783 



aquatica, 788 



Ashei, 785 



digitala, 786 



falcata, 785 



laurifolia, 787 



lyrata, 784 



macrocarpa, 784 



nigra, 787 



tridentifera, 788 



1766 



