220 MISSOURI BOTANICAL GARDEN. 
Spartium, 103, (104), 
Spergula, 98. 
Spergularia, 98, 
Spermothamnion, 190. 
Sphacelaria, 193, (193). 
Sphaerococcus, 190, (190), (191), 
Sphaerotheca, 208. 
Sphagnum, 184. 
Spiraea, 110, 
Spirogyra, 194. 
Sporomega, 209, 
Stachys, 142. 
Statice, 130, 206. 
Staurastrum, 195. 
Stellaria, 98. 
Stereocaulon, 200. 
Stereodon, (178). 
Sticta, 203. 
Stigeoclonium, 197. 
Stypocaulon, 193. 
Symphytum, 134, 
Synedra, 194. 
Tabellaria, 194. 
Taraxacum, 127, 207. 
Taxus, 169. 
Tetracdron, 196. 
Tetraspora, 196. 
Thamnium, 178, 
Thapsia, 117. 
Theloschistes, 203. . 
Thrincia, (127). 
Thuidium, 179. 
Thymus, 140. 
Tillaea, 111. 
Tilletia, 208. 
Tolpis, 125. 
Tolypothrix, 198, 
Torilis, (117). 
Tormentilla, (110), (111). 
Tortula, (182), (183). 
Trachelium, 82, 128. 
Tradescantia, 153. 
Trentepohlia, 197. 
Trichomanes, 170, (170). 
Trichonema, (152), 
Trichostomum, (182), 183 
Trifolium, 105, 209, 
Trigonanthus, (186). 
Trigonella, 104. 
Triodia, 165. 
Triticum, (168), (169), 
Wlex, 103. 
Ulmas, 149, 
Ulothrix, 197. 
Ulva, (197), (198), 198. 
Umbilicus, (112). * 
Urginea, 152. 
Urococcus, 196. 
Uromyces;, 206. 
Urospermum, 128, 
Urtica, 149, 
Usnea, 202. 
Ustilago, 208. 
Vaccinium, 129, 
Valeriana, (119). 
Valerianella, 119. 
Verbascum, 135. 
Verbena, 139. 
Veronica, 137, 
Viburnum, 118, 208, 
Vicia, 108. 
Vidalia, (120). 
Vinca, 131. 
Viola, 96. 
Vitis, 208. 
Vulpia, 167. 
Wahlenbergia, (129). 
Webera, 181. 
Weisia, 184, (184). 
Woodwardia, 171. 
Xanthium, 121, 
Zea, 207, 208. 
Zebrina, 153. 
Zonaria, 189, 193, (193). 
