= Page. 
POrnassiOs 22084225555. eee atin t eet eee: QUA Nal Kies see ete ee tikes esas 21 
Peslicilatia: cnc ot ecciau steed otiev anced Meds ay 245: SalsOla ocean vee stance sseee i kos 248 
Pellaa cicia tae neenes ee 260 Nalviniew ccc eci eee sla sae sace cae eew cess 246 
Pentatetion. .......0.0...2000 05002 243,244, Sambucns.........2.0... 0c e eee eeeeee eee ees 229 
Peramititi. ..20.066 ser eee cele. 252. -Sanguisorba s 2500000056) nies sate es sees ee 223 
Peronospora ooo... 0... cece ee eee 276 | Sanieula cess coves ccoek see easter 2 
Petasite sg: ceccaise e306 ed hhc sav dee Sasa 235 | Samssurea@...........00eceeeeeeceeee ee ence 236 
Peucedanum ........ 0... cee eee eens 227) Saxifraga.. cc. ccc. cece cece cece eee eee eeeee 24 
Phacelis.. 2.3 226 2 sed oie ees 2422 SONS eet tei tease tana 257 
Phalaria.:.: 3s s<c4ccsscetetsgeasie ease et 260- SCillaacveeer nese es eee bee ond seeds 253 
Phegopteria ............. 00.006 cee cece eee 268° USCIPPUR cess coeneke os see eeen ets peas na ees 257 
Philadelphus...............-2. 20.00. 0000005 224 Scleropodium ..............0...2 2 eee eee eee ure | 
Philonotia 0.000.000.0000 ce ce eee 71 Scorzonella ........0..ccce cece ccc ccccceceees 28h 
Phragmidium .............2......02---02 20 21S: “SCoulOria : sc see ia deid bed teke seed eee 270 
Phy aalisessioic G00 Fide Haase ewes 24300 Serophularia .. 2... 0... ce eee cee eee 243 
Phy sostegia.2 2 c0.i.cees gic es see cess 24600 Scutellaria ....... 0.0... eee ee eee eee 246 
WPA ee ea ie eee 266 Sedum ...........0 0... eee eee 225 
Plagiobothrys.... 2.0.00. 22. e eee eee eee 24200 Selaginella.............0.00- 0-0 eee eee eee 268 
Plaiochila............-2.20.02220-20ee ee eee 275) Senecio... 0-2. .... 0. eee ee eee eee 235, 26 
Plagiothecium .................0.2. 0.2 eee 214 “Septoriaecest scccnc shud cadese dead 276 
Plantago:::- 22 :i52200.54-440s 0009 seed agst Z4i0 Shepherdia.................0. 000 e ee eee ee 249 
Platanthera <cc022¢ 0200 dies cic iiiasats 252 Sibbaldia ....0.... 00. .c cece cece eee eee eee 223 
Platyapermum............. ... Tee anes 913 Sida ccdacee keto diecead eee eee beta ee 2 
Plectritia...000.0.0000000000 000000002002 2ee ee 230) Sidaleea... oc. ccc cw wee c ccc cece receaee 27 
DOR. ek gseeis ce ress ae sie sacee heise 262, 263, 264 | Silene... cece eee eee eee eee 215. 216 
Polanisia 22 cc. 2 i022 see econ cddsag yen 003 es 214 Sisymbrium.............00ceeeee eee eee) TEA 
Polemonium ..........0.002..02 000 e eee eee 241 | Siavrinchium ....-....0..-eeeceeeee ence eee whe 
Poly souum.............0 202 cece ee eee 248,249 Sium......... 0 woe... ele teeters oes ap es 
Poly podhum .... 2... c ee cee cee ee #68 Smilacina..... 2.000. ecw cece eee ee 2 2d 
Poly pogon re ee rer ee ee ee 260) «Solanum ...... 2.0... cee ce ee eee eee 244 
Polytrichaum ......0..0000000.0 00 cece eee eee 42. SOM aLO cece Seckcw Rhee oe eee? 231 
Potamogeton...... 202.2000... eee eee 256 Sonchus .............ccceceee cece eee ees 257, 2B 
Potentilla ............ PAececn ones thai: 222,293 Sorbus. ....cccccccccccccccceeccccceeerees . 23 
Potting oct ees cath dew eke cs veda 269) Spartina ...........0 coe cee ee eee eee 262 
Prenanthes ... 2000.00.00... c cece ee eee 237,238 Speonlaria ..........02 000. eee eee eee 238 
Prosartes ...0..0. 00.002. cce cee cee eeeeace 254 Sphagnum ............ 0.000. cece eee ono 
Promella . 22.2000... 2c eee eee 24600 Sphivralcea ....... 02.0.0. 022 eee eee 217,218 
POPU etc Seite! Be hee tas 221 | Spiraea... co.cc cece ccc ce cence eeeee eee . 224.22 
Paeudoleskea .... 2.2.0.0... 0c cee eae 273 | Spiranthes..........00.-6.e22-200- eat 252 
Paeudotauga ... 22.2220. 0 eee 266 | Stachys .-ccccccc---scececcscecccerseccerees oa 
Psiloc hana... 2.2.2.2... cece eee ee eee O57. “Steivnieidaiecéncce.csscasaaieeuees gees 240 
Psoralea .. 2.02.2... e cece cee cee 220 Stellaria ......ccc ccc cecccceceecceeeeeeree ae 
PROT is 25000. occ edit oe esd aediae Seed 267 Stenactis............cnence cece ee eee eee: =? 
Pterospora..... 2.200. .0.0... 000 cee eee 239 «= Stenanthium............------- eee 2n5 
Prilidium ......0000 000000000000 ccc ce cee eee 275 Stephanomeria..............-022----0 557° ; ale 
PtlOria cede tty iets sas e2 estes foot O36. Stings stesei oes ncaedenhewesaeeeterence 260 
PaCOinia - 25.3. s ig voce denen ids fasioteeleccd 276 Streptanthus ............. eee ee eee 212 
Pulmonaria ...... 2.0.0.2 .00 2.00. ccc eee eee 242 Streptopus.........0-..--- eee eect 2 : 
Dy rilass cocoa roe ath eee an bes ate 239°“ Stylopappus ............--2--20228 6 eee 
Pyrrocoma.... 2.0.0... 0.0.0. c ec cee cee ee 231) Suda 2... eee cece ee eee ee ee ett? eh 
USTs orbs ned Sete odes oes 223. Svmphoricarpos........--.-----0 eee aad 
Ranunentus. .....0200......2.0005 er eee 209. 210 Synth NTIS oes es sh de ee ciel eats 244, 245 
Rayoumofakya...... 0... eee eee OROe “SCALE iOlilibcioeeic ciate cone ense soe 208 
Rhacomitrium ......00.00000000.00.0..0.0... 270 Tagetes Tease eeist ete eee eta hea ita eee of 
Rhammna.. 2.2... 00. 218 9 Taraxacum ........2.2000eeee cere on 
1H ic) eee ree ee ee a we ddasa a, Pe eee enn ae 
LL 219) Tellima ....... 00.0.0. 202. 2 eee eee = 
TN chek ei ot eee eon tanala ase Sods 224.225 Tetradyvmia ..........2.-... 2 eee eee os 
Rigiopappus . .......-.-.. 2.0... 234, Tetraphis...........-20-.-.--e0eeeer oe 
RGOTipa seeps pele beeen ge ees 212 : Thalesia ...............--2- 22 eee as 
Rosa... oc... eee ee a 223 | Thalictrum ...........---.02.5--00rt an) 
Rubus ....... wee ee nee cee eee eee eee 222 | Thamnium...........--.-.--0222-22 000007 aie 
Rudbeckia .... 2.02... 0-062 -s seco eee eee eee 233 | Thelypodium .......-..-+--6--02 eer 219 
Rumen... 2-2. 22.2 eee eee ee eee eee eee 249 | Thermopsis .......-..-------202ee rt 267 
Sagittavia....-.2. 202-022. e ec ce eee ween ee 256 | Thuy a ccc ceccci chee we vevseaceseaneeeseeet* 
