810 
PPUNUS TNS io ssicice. bk Bacco’: 305 
——americana MARSH....... 305 
Prunus borealis Pomr......... 308 
—cartilaginea LEHM...... 306 
—cuneata RAF....... befsia 306 
——depressa PURSH......... 306 
—duerinckiiWALpP......... 307 
--—hiemalis MIcHX........ 305 
— hirsuta ELL...........,. 307 
—lanceolata WILLD....... 307 
— mississippi MARSH...... 305 
——nana DURO1............ 307 
——nigra MUGL............ 305 
—obovata BIGEL.......... 307 
——pennsylvanica LINN. f.. 307 
—-persicifolia DESF....... 308 
—pumila LINN............ 306 
——rubra AIT........40-066. 307 
—servtina EHRH.......... 306 
—-serotina Poin........... 307 
—spinosa WALT .... .... 305 
-—virginiana LINN........ 307 
—virginiaua MILL........ 306 
Prunus-Cerasus canadensis 
MARSH) css daaks eames 307 
— montana MARSH........ 307 
PascGalivm CASS oc < cece cece cee 554 
Psamma BEAUV.............- 67 
Psammoseris BOIss..........- 567 
Pseudantheae ENDL.......... 340 
Pseudocapsicum MoENCH.... 458 
Pseudocarex MIQ........+.... 106 
Pseudocyperus SEGU ......... 103 
Pseudofumaria Lupw........ 254 
Peng TAR ia sacas.cotars connate 402 
—mculata (LINN.)........ 402 
—umbellata (LINN.)........ 402 
Psilocaenia NUTT...........-- 568 
Psilorhegma VOG............. 309 
Psilosanthus NECK........... 504 
Psolanum NECK. cs ace cess 458 
Psordled, ValN Nip xe saies deere etc 330. 
Psoralea alopecuroides Porn... 330 
. argophylla PURSH...... 331 
—pbrachiata DouetL....... 330 
—candida Porr.......... 329 
—dalea LINN.?........... 320 
Psoralea esculenta PURSH...... 330 
Psoralea floribunda Nurr.... 330 
Psoralea incana NUTT......... 331 
Psoralea parviflora Porr...... 325 
Psoralea tenuiflora PURSH..... 330 
Psorophytum SPACH.......... 362 
Psycanthus RAF.........-0566 338 
Psychrogeton Boiss........... 515 
Psychrophila GAY............ 230 
Psyllophora EHRH............ 106 
—pauciflora SCHUR....... 130 
‘Ptarmica NOR cases eee any s+ 549 
— borealis DC............. 549 
Peleg LINN: sssec.o% ya oe 9.9444 338 
Ptelea pentaphylla Fasre..... 338 
—tomentosa Raf......... 338 
Ptelea trifoliata LINN.......-.. 338 
METASPERMAE OF THE MINNESOTA VALLEY 
Ptelea viticifoliaSALIsB...... 
Pterochilus Hoox. and ARN.. 
PterolepisSCHRAD............ 
Pteroloma BENTH 
Pteroneuron DC.............. 
Pteronia caroliniana WALT... 
Pterophylum Norv.......... 
Pteroselinum REICH.......... 
Pterosenecio ScH.-BIP........ 
Ptérova P. BR. ss antecese ote. 
Pterotheca CASS.............. 
Pterotheca PRESL............ 
Ptilagrostis GRIS............. 
Ptilochaeta NEES............. 
Ptilosciadium STEUD......... 
Ptilostemon CASS............. 
Pugiopappus ToRR........... 
Pulegium MILL............... 
Pulicaria annua GAERTN..... 
Pulsatilla TOURN............. 
—hirsutissima BRITT..... 
—nuttalliana SPRENG. .238, 
—patens GRAY............ 
Punduana STEETZ............ 
Purshid: RAP si44sdeccnsncese ne 
Purshia SPRENG............5- 
—mollis LEHM.......... 436, 
Putranjiveae ENDL........... 
Putteriickia ENDL............ 
Pycnanthemum MIcHN....... 
—flexuosum RBSP....... .. 
—lanceolatum PURSH..... 
——linifolium PURSH....... 
—virginidnum EH[1TcnH..... 
—virginicum PERs...... Mea 
Pycreus: BRAUV:. .cidcccateeais 
Pygmaea Hook. f............. 
Pyrola see Pirola............... 
Pyrola. MOR ics ecenen cncesa en 
—corymbosa BERT........ 
— maculata LINN......... 
—umbellata LINN......... 
Pyrrheima Hassk............. 
Pyrrhopappus A. RICH........ 
Pyrrovoma Hook............. 
PYyri8 $€@ PUirus . ccccewonsc aca be 
— americana NEWB....... 
—aucuparia MEY......... 
—bartramiana TAUSCH... 
—coronaria var. iowensis 
—wangenheimiana 
TAUSCH 
—-sanguinea PURSH....... 
. Pythagorea RAF.............. 
—alata RAP............08. 
Q 
Quamoclidion CHOIS.......... 
Quercophylum oo... 0.0 eee eee eee 
Quercus LINN. ...... 0... cee e ee 
