Lake Maxinkuckee, Physical and Biological Survey 495 



Poplar, Silver-leaf, 275. 



Swamp, 276. 



White, 275. 



Yellow, 305. 

 Poppy Family, 317. 

 Populus alba, 275. 



candicans, 275. 



deltoides, 278. 



grandidentata, 37G. 



heterophylla, 276. 



tremuloides, 276. 

 porata, Amnicola limosa, 73. 

 Porcellio scaber, 78. 

 Porcupine-grass, 229. 

 Porella pinnata, 418. 

 Portulacaceas, 299. 

 Portulaca oleracea, 299. 

 posita, Nehalennia, 22. 

 Potamogeton americanus, 176, 213. 



amplifolius, 171, 212. 



compressus, 169, 215. 



filiformis, 170, 216. 



friesii, 169, 215. 



heterophyllus, 177, 213. 



interruptus, 178. 



lucens, 176, 214. 



natans, 31, 177, 211, 294. 



pectinatus, 174, 216. 



perfoliatus, 175, 214. 



praelongus, 214. 



pusillus, 170, 215. 



robbinsii, 170, 217. 

 Potamogetons, 312. 

 Potato Family, 407. 

 Potato, Sweet, 347. 



Wild, 344. 



Vine, Wild, 396. 

 Potentilla canadensis, 330. 



monspeliensis, 330. 

 Potter-wasp, 40. 

 Potts, Edward, 103. 

 Poverty-grass, 230. 

 praelongus, Potamogeton, 214. 

 Prairie Burdock, 437. 



Button-snakeroot, 429. 



Dock, 437. 



Chloris, 233. 



Ground-cherry, 407. 



Moneywort, 388. 



Wake-robin, 267. 

 prasinus, Cyclops, 107. 



Prasiola parietina, 155. 



pratense, Phleum, 231. 



Poa, 237. 



Trifolium, 340. 

 preslii, Chamaesyce, 351. 

 Pretty Lake, 42, 56, 65. 

 Prickly Ash, 350. 



Lettuce, 424. 



Pear, Western, 370. 



Sida, 365. 

 Primrose Family, 388. 

 Primulaceae, 388. 

 princeps, Epicordulia, 25. 

 Prince's Pine, 384. 

 procumbens, Gaultheria, 387. 



Rubus, 332. 

 Procumbent Wood-sorrel, Yellow, 349. 

 procurvatus, Pleuroxus, 107. 

 profunda, Polygyra, 74. 

 promethea, Callosamia, 39. 

 propinquus, Cambarus, 83, 85. 

 Proserpinaca palustris, 374. 

 proserpinacoides, Floerkea, 349. 



Myriophyllum, 375. 

 prostrata, Cymbella, 164. 

 Prostrate Amaranth, 296. 



Tick-trefoil, 342. 

 protodice, Pieris, 38, 39. 

 Protozoans, 95. 

 pruinosa, Physalis, 407. 

 Prunella vulgaris, 403. 

 prunifolium, Viburnum, 420. 

 Prunus americana, 336. 

 Psephenus lecontei, 33, 34. 

 pseudargiolus, Lycamopsis, 39. 

 pseudo-acacia, Robinia, 341. 

 psilostachya, Ambrosia, 427. 

 Psorophora ciliata, 36. 

 Ptelea trifoliata, 31, 350. 

 Pteridium aquilinum, 203. 

 Pterophylla camellifolia, 28, 2!». 

 pubescens, Physalis, 407. 



Viola, 370. 

 Puccoon, Hairy, 400. 



Hoary, 400. 

 Puccoon-root, 317. 

 pulchella, Vallonia. 75. 



Goniobasis, 73. 



Libellula, 11, 16, 26. 

 pulchellus, Erigeron, 435. 

 pulegioides, Hcdeoma. 405. 



