INDEX. 769 
Potentilla arguta Pursh, 390 
canadensis L., 31, 363, 391 
effusa Dougl., 569 583 
hippiana Lehm., I9I 
leucocarpa Rydberg, 30, 583 
monspeliensis L., 30, 390, 583, 
626 | 
Nicolletii (Wats. ) Sheldon, 30, 31 
pennsylvanica strigosa Pursh, 553, 
583 
pentandra Engelm., 31 
supina var. Nicolletit Wats., 31 
Prenanthes, 546 
Primulaceze, 400, 589 
Protococcacez, 198 
Protococcus, 195, 617 
Protomyces, 199 
Prunella vulgaris L., 363, 404 
Prunus, 429 
americana Marsh, 363, 392, 584 
nigra Ait., 363, 368, 392 
pumila L., 549 
serotina Ehrh., 363, 392, 584 
virginiana L , 363, 366, 392 
Psoralea argophylla Pursh, 543, 584 | 
Ptelea trifoliata Linn., 75, 84, 87, 111, | 
E40, 131, 132, 133 | 
Pteridophyta, 369 
Pteris aquilina L., 363, 366, 371 
Pterygophora californica Ruprecht, 723 
Ptilidium ciliare (L.) Nees, 193 
Puccinellia airoides (Nutt.) Wats. & 
Coult., 569, 574 
Puccinia Persoon, 537, 543, 545, 551,552 _ 
adoxe Hedw., 544 
zegra Grove, 640 
alpina Fekl., 640 
amorphe Curt., 544, 552 
anemones-virginianz, 537 
angustata Peck, 546 
argentata (Schultz) Wint., 549 
asteris Duby, 550 
calthee Lk., 544 
caricis (Schum.) Rebent., 546 
Chondrillze Corda, 546 
circzeze Pers., 550 - 
convolvuli (P.) Cast., 544 
deglubens, 552 
densa D. & H., 633, 639 
effusa D. & H., 639 
elymi Westd., 552 
| Puccinia 
emaculata Schwein., 550 
Fergussoni Berk. & Br., 639, 640 
Fergussont hastat@ DeT., 633 
galii (P.) Schwein., 544 
gentianze (Strauss) Lk., 544 
graminis Pers., 548 : 
grossulariz (Gm.) Wint., 541 
haleniz Arth. & Holway, 551 
hastat@ Cooke, 633, 637, 638 
hieracii (Schum.) Mart., 543, 548 
hydrophylli Peck & Clint., 551 
kuhnize Schwein., 549 
Mariz-Wilsoni Clinton, 639 
menthze americana Burrill, 545 
mesomegala B. & C., 551 
nardosmiz E. & E., 551 
ornata Arth. & Holw., 550 
peckiana Howe, 552 
petalostemonis Farlow, 552 
phragmitis (Schum. ) Korn, 547 
pimpinellz (Strauss) Link, 544 
poculiformis (Jacq.) Wett., 548 
podophylli Schwein., 549 
polygoni-amphibii P., 549 
porphyrogenita Curt., 551 
pruni-spinosze Pers., 549 
rhamni (P.) Wettst., 547 
rubigo-vera (DC.) Wint., 548 
Schceleriana Plow. et Magn., 556 
sorghi Schwein., 550 
tanaceti DC., 545 
taraxaci Plowright, 548 
thalictri Chev., 550 
tiarelle B. & C., 551 
tomipara Trel., 549 
variolans Hark., 550 
viol (Schum.) DC., 544, 631, 633, 
640 
Violarum Link., 633 
xanthii Schwein., 551 
Pucciniacez, 537, 540 
Pucciniopsis, 543, 549 
Pulsatilla hirsutissima(Pursh ) Britton, 
367, 387 
Pylaisia heteromalla Sch., 48 
polyantha Sch., 48 
Pylaisiellz, 36 
Pyrenopsis, 282 
melambola Tuck., 280, 313 
phzococca Tuck., 280, 313 
