Xii 
Podozamites, 132. 
Pogonia, 256. 
Pogonopus, 107. 
Pohlia, 25, 165. 
Polanisia, 314. 
Polemonium, 170. 
Pollichia, 266. 
Polygala, 186, 252, 256. 
Polygonatum, 343. 
Polygonum, 84, 122, 132, 172, 223, 254, 260. 
Polymnia, 199, 253. 
Polypodium, 187. 
Polyporus, 276, 303. 
Polypremum, 187, 254. 
Polypteris, 377. 
Polysiphonia, 335, 339. 
Polytrichum, 49, 65, 379. 
Pombalia, 268. 
Pontederia, 376. 
Populus, 165, 172, 214, 225, 291, 327. 
Porella, 215. 
Poronia, 94. 
Porophyllum, 93. 
Porotrichum, 348. 
Posoqueria, 108. 
Potamogeton, 92, 128, 216, 244. 
Potentilla. 99, 152, 159, 169, 189, 193, 342, 364. 
Poterium, 121. 
Pottia, 50. » 
Poutaria, 227. 
Primula, 170, 
Pringsheimia, 340, 
Prionium, 18, 
Proserpinaca, 239. 
Protococcus, 141. 
Protomyces, 281. 
Prunus, 315,139, 133, 159, 277, 288, 291- 
Pseudoleskia, 54, 165. 
Pseudovalsa, 94. 
Psilotrophe, 314. 
ralea, 187. 
Psychotria, too, 
Pterigophyllum, 55. 
Pterigynandrum, 55. 
Ptilimnium, 367. 
Ptiloria, 98. 
Puccinia, 225, 279, 292, 316, 348. 
Puccinellia, 124. 
Pulsatilla, 98. 
Punctaria, 337. 
Purshia, 242. 
Pylaiella, 337. 
Pycnanthemum, 189, 344. 
Pyrenophora, 04. 
Pyrola, ror, 152, 170, 343, 379- 
Pyrrhopappus, 253, 314. 
19, 316. 
Pyrus, 136, 191, 222, 227, 291, 316. 
Pythium, 225. 
Pyxidanthera, 106, 
Quercus, 26, 67, 72, 72, 136, 172, 195, 276,292, 293, 
327. 
esnelia, 300. 
inoa, 225. 
Rafinesquia, 308. 
Ram » 292. 
Ranunculus, mm 97) 995 131, 167, 193, 197, 213, 265, 
19, 341, 363. 
Maphacin. 48. 
Raphidostegium, 348. 
Raphoneis, 131. 
Ravenelia, 378. 
Lecter agi 262. 
ynosia, 70, 349. 
Rhamnidium, 70, 349. 
hamnus, 2 07, £52, 197, 277, 321 . 
Rheohitmeniocs. 165. rey H ieg 
Rhexia, 187, 251. 
Rhinanthus, 22, 66, 
Rhizoclonium, 335. 
Rhododendron, 97, 99, 186, 255, 292, 314. 
Rhodochorton, 335. 
Rhodostachys, 32. 
Rhopalomyces, 95. 
Rhus, 17, 158, 252, 269, 286, 343, 379- 
Rhynchosia, 187. 
Rynchospora, 369. 
Ribes, 121, 169. 
Riccia, 75, 278. 
Richardsonia, 262. 
Riddellia, 314. 
Rigiopappus, 318. 
Robinia, 126, 165, 281. 
Rodriguezia, 292. 
Rosa, 152, 158, 159, 169, 256, 292, 342, 379. 
Rosellinia, 94. 
Rostkovia, 18. 
Rubus, 30, 31, 99, 100, 131, 158, 169, 193, 223, 311, 
17, 323, 342, 366, 379. 
Rudbeckia, 192, 200, 304, 342, 374. 
Rudgea, rro. 
Ruellia, 188. 
Rumex, 152. 
Ruppia, 92. 
Russula, 226. 
Sabal, 71, 133, 193, 278, 377- 
Sabuaria: a mt 188, ac 
Sabicea, 107. 
charomyces, 280. 
Sagina, 159, 268. 
Sagittaria, 65, 128, 254. 
Salicornia, 47. 
Salix, 123, 172, 196, 214, 327. 
ola, 274. 
Salvia, 254, 287, 318, 345. 
Salvinia, 13, 33. 
Sambucus, 38, 158, 170, 223, 317. 
Sanguinaria, to1, 193, 277. 
Sanicula, 193, 318. 
Sapindus, 349. 
Lg seo 
ponaria, 132, 169, 247. 
Saranthe, 32. a” 
Sarcodes, 9g, 211. 
Sarcomyces, 288, 316. 
Sarracenia, 193, 212, 214, 290. 
Sassafras, 223, 289. 
Saxifraga, 169, 189, 193, 270, 288, 323. 
Scabiosa, 264. 
Scaphosepalum, 32. 
Scheefferia, 349. 
Schedonardus, 378. 
Schizocarpum, 286. 
Schizonotus, 159. 
Schmeidelia, 278. 
Schomburgkia, 293. 
Schrankia, 186, 377. 
Schultesia, 158. 
Sciadoph um, 37: 
Scilla, 8. 
Scirpus, 148, 214, 370. 
Scleria, 191. 
Sclerocarpus, 287. 
Scolytus, 290. 
Scoparia, 278. 
Scouleria, 165. 
Scrophularia, 343. 
Scutellaria, 152, 311. = 
Scybalium, 293. 
Sebastiana, 287, 314. 
Sedum, 169, 189, 323. 
Senebiera, 267. 
Senecio, 170, 176, 196, 199, 205, 311. 
Septoria, 162, 278, 372. 
Sequoia, 132. 
pias, 258. 
icocarpus, 18r. 
jania, 293. 
Seseli, 38 
