INDEX 339 



Page 



Polyporus elegans 57 



ignarius .• 57 



picipes 57 



schweinitzii 57 



Polystichum achrosticoides . . 72 



Polystictus hirsutus 57 



perennis 57 



pergamenus 57 



versicolor 57 



zonatus 57 



Polytrichium piliferum 50 



Pomoxis sparoides 25, 27, 247, 251 



Pontederia cordata 25, 84, 128, 130, 134, 180, 182, 197, 198, 199, 209, 212 



Pooecetes gramineus • 273, 274, 292 



Popiilus alba 88 



balsamifera 22, 70, 88, 144, 183, 212 



deltoides 88 



grandidentata 21, 88, 144 



nigra italica 88 



trerauloides 22, 43, 44, 47, 49, ' 8, 144 



Poria vaporia 56, 60 



Portulaco oleracea 92 



Potamogeton angustifolius 75 



filiformis. 75 



heterophyllus 37, 75 



longipedunculatus 75 



foliosus niagareiisis 75 



natans ". ...75, 131, 134, 139 



pectinatus 37, 75 



perfoliatui? 37, 75 



riehardsoiiii • 75 



Potentilla anserina 41, 46, 47, 98 



argentea 98, 212 



canadensis 41, 98 



fructico.sa 43, 98, 182, 209 



monspeliensis " 51, 97, 209, 212 



paliLstris 41, 98 



Pound, R 58, 63 



Precipitation 28 



Prenanthes alba 120 



altissima 120 



racemosa. 120 



Procyon lotor 311 



Progne subis 275, 294 



Proserpinaca palustris 104 



Prunella vulgaris 110, 182, 208, 209 



Prunus americana 99 



cerasus 99 



pennsylvanica 21, 50, 99 



pumila 21, 47, 49, 50, 71, 99 



serotina ' 99 



virginiana 21 , 48, SO, 70, 99 



Psedera vitacea 45, 51, 102 



Pseudopotnata brachyptera 223 



reversa 223 



Pteris aquilina 48, 49, 51, 52, 72, 144 



Ptychostomus aureolus 249 



Pulmonata 153 



Punctum pygmaeum 143, 147, 149, 157 



Pupilidae 159 



Putorius noveboracensis 312 



vison 312 



