Xi 
Rhexia, 228, 234. 
Rhipsalis, 274, 499- ¥ 
Rhizoctonia, 298. 
Rhizomorpha, 296. 
Rhizophora, 174. 
Rhizopus, 176. 
Rhizosolenia, 246. 
Rhodochiton, 4:5. 
Rhodochytrium, 274. 
Rhododendron, 57, 64, 235, 346, 437, 438, 482, 
Rhus, 61, 88, 159, 160, 164, 167, 223, 230, 233, 2515 
294, 348, 482, 500. 
Rhynchospora, 66, 238, 479» 499 
Rhynchostegium, 410. 
Riccia, 23. 
Ricinocarpus, 175. 
Rinodina, 351, 352, 355. 
Rivinia, 128. \ 
Robinia, 160, 161, 157, 233, 499. 
Rodriguezia, 499. 
Reestelia, 367. 
Rosa, 62, 228, 230, 233, 481. 
Rostafinskia, 80. 
Rotala, 482. 
Rubus, 62, 129, 223, 230, 233, 278, 340, 348, 364, 
499, 448, 476, 481. 
Rudbeckia, 53, 83, 229, 235, 346, 484. 
Rumex, 54, 237. 
+ aed gre 28. 
uppia, 270, 273, 4 
Rusbya, 24, 67, G8 338. 
Russelia, 269. 
Sabal, 169, 364. 
Paseo ey 
Sabbatia, 64, 230. 
Saccaromyces, 415. 
Saccoglottis, 497. 
Sagina, 230, 232, 480. 
Sagittaria, 66, 231, 238, 242, 283, 478. 
Salicornia, 237. 
Salix, 43, 65, 87, 164, 167, 225, 237, 274, 441, 453- 
Salsola, 225, 229, 237, 341. 
Salvia, 269, 416. 
Salvinia, 499. 
Sambucus, 62, 161, 234. 
Samolus, 231, 235. 
Sanicula, 87, 482. 
Sapindus, 345, 500. 
Saponaria, 52, 232, 343. 
Saprolegnia, 346. 
Sarracenia, 59, 61,87, 331. 
Sassafras, 65, 169, 345, 443, 481. 
Saxifraga, 68, 69, 496- 
_ Scabiosa, 22, 169, 170, 490. 
Scandix, 241. 
Scenedesmus, 243. 
Schistocarpa, 378. 
Schizza, 436. 
Schizophyilum, 296. 
Schkuria, 269. 
Schlegelia, 88. : 
Scirpus, 238, 284, 409, 479, 499. 
- Scolopendrium, 443, 461. 
Saeokulata, tn ed 
500. 
Septoria, 251, 298, 443. 
‘Ser pias, a 
enza, 169. ‘ 
Serenopsis, 169, 334- 
Sericocarpus, 4, 6, 8, 16, 484. 
Serjania, 450, 499. 
Sesbania, 263. 
Setaria, 196. 
Sequoia, 415. 
Shepherdia, 225. 
Shortia, 325. 
Sidalcea, 344. 
Sideroxylon, 140. 
| Sieglingia, 202, 479, 495. 
Sigillaria, 303. 
Silene, 61, 250, 263, 294, 343, 344. 
Siphonychia, 382. 
Siphoptychium, So. 
Sirobasidium, 87. ~- 
Sisymbrium, 52, 232, 252, 253, 360. 
Sisyrinchium, 237, 409, 453, 467. 
Sium, 62, 229, 234. 
Sloanea, 88 
Smilacina, 224, 230, 409. 
Smilax, 66, 164, 168, 172, 237, 295, 480. 
Solanum, 53, 88, 236, 275, 382, 410, 500. 
Solea, 482. 
Solidago, 2, 4, 5, 6, 7, 16, 25, 53, 56, 58, 59, 62, 63, 
207, 208, 209, 210, 229, 234, 235, 286, 409, 416, 
447» 475» 477, 484, 485. 
Solorina, 354. 
Sonchus, 53, 229, 235. 
Sophoclesia, 138. 
Sophora, 500. 
Sorghum, 197, 443- 
Sparganium, 231, 238. 
Spartina, 196, 239. 
S a, 232. 
Spheeraclea, 496. 
Spherella, 220. 
Sphzroccites, 30. 
Sphzrotheca, 296. 
Sphzrozosma, 244. 
Sphagnum, 127, 263, 273. 
Sphenopteris, 95. 
Sphenophyllum, 414. 
Spirza, 56, 57, 59, 61, 230, 233. 
Spiranthes, 34, 188, 269, 295 302, 453. 
Spirogyra, 244, 348. 
Sporobolus, 199, 200, 479, 495. 
Spraguea, 135. 
Stachys, 241, 483. 
Staphylea, 159, 164, 167. © 
Staurastrum, 245. 
Stauroneis, 245. 
Steironema, 64, 302, 483. 
Stellaria, 57, 61, 175, 240, 277, 341- 
Stellularia, 175. 
Stemodia, 496. 
Stemonitis, 76, 77, 78, 79, 80, 82. 
Stenotaphrum, 297. 
Stenzelia, 221. 
Stephanodiscus, 246. 
Sterculia, 36. 
Stevia, 269, 432. 
Stibbum, 297. 
Sticta, 353. : 
Stigmatophyllon, 348. 
Stipa, 198, 495. 
Stipulicida, 343. 
Stokesia, 83. 
Strelitzia, 343. 
Streptanthus, 86, 344. 
Pom ia, 109. 
5. 
Stuartia, 226, 476, 482. 
Stylosanthes, 269. 
Styrax, 88, 140. 
Suzeda, 229, 237. 
Sullivantia, 28. 
Surirella, 246. 
a ap » 88, 241, 432. 
yMplocos, 140, 437 : 
Synedra, 245. ce. 
