3oS 



[450 



References to the Flora are in brackets [ ] 



Portulaca [i35 



grandiflora [135 



neglecta 71, [135 



oleracea 71, [135 



Portulaca [135 



PORTULACACEAE ... [135 



Potamogeton [83 



diversifolius [83 



fluitans 18. [83 



Hillii 18, [83 



hjbridus 18, [83 



lonchites [83 



pusillus 18, [83 



Spirillus [244 



POTAMOGETONACEAE [83 



Potato [205 



Polentilla 39, [154 



Canadensis 43, [154 



simplex [iS4 



leucocarpa [i54 



Monspeliensis [iS4 



nor-wesrica [iS4 



paradoxa 23, [154 



rivalis millegrana [ I54 



supina [154 



Poverty grass 64, [go 



Poverty gn^ass association . 6. 



Prairie clover [160 



violet [160 



white [160 



Prairie dock [231 



Fratenses 



medicaginoides 



phleoides ... 



trif olioides , 



Prenanthes 



altissima 44, 



crepidinea 



Prickly ash 



Prickly pear 65, 



western. 



Prickly pear association.. . 



Primrose [183], 



rock 



showy 



Primrose willow 



creeping. . 



Primrose willow association 



Pbimulaceae 



Primulales 



Prince's feather .... 



Prunella, see Brunella 



Prunus , 



Americana 41, 52, 



Cerasus . 



domestica 



hortulana 41, 52, 



-41, 48, 



Persica 



serotina 



Virginiana. . , 

 Psoralea 



tenuiflora ... 61, 62, 



Psoralea association 



Ptelea 39, 



trifoliata 41, 



Pteridophyta 



Puccoon 



hoary 63, 



Pulse family 



Pumpkin 



fetid wild 



Purslane 



large 



water 



Purslane association 



Purslane family 



Pussley 



Putty root 



Pyciianthemzim 



Hniifolium 



muticum filosum 



Pyrus 



angustifolia. . . . . .41, '~,^, 



communis 



lowensis 52, 



Malus .. 



Quack grass 



Quamash 



^uamassia . . . . 



hyacintki7ia 



Quassia family. 



Quercitron.. . 



Quercus 38.54, 



acuminata 



40, 41, 45, 47, 58, 60, 

 alba . .39, 41, 45, 47, 48, 



bicolor 



coccinea 



tinctoria 



imbricaria. . .40, 41, 47, 49, 



X palustris 



y tinctoria 



X Leana 



macrocarpa 



34, 40, 41, 45, 48, 54, 

 Marylandica. . . .40, 60, 64, 



minor 



Muhlenbergii 



nigra 



obtusiloba 40, 60, 64, 



palustris 



4, 28, 34, 40, 48, 54, 



platanoides 



25, 34, 40, 48. 54, 



