22 
GENERA OF NORTH AMETICAN PLANTS. 
Scilla, 160 
Scleria, 174 
Scleranthus, 69 
Scolopendrium, 174 
Scorzonera, 113 
Scrophularia, 130 
Scutellaria, 138 
Secale,. 171 
Sedum, 85 
Selloa, 113 
Selinum, 2 
Senecio, 113 
Sennebiera, 9 
Serpicula , see Udora 
Sesbania, 45 
Seseli, 3 
Sesleria, 171 
Sesuvium, 86 
Seymeria, 131 
Shepherdia, 36 
Shubertia, 145 
Sibbaldia, 41 
Sicyos, 108 
Sida, 19 
Siegesbeckia, 113 
Silene, 81 
Silphium, 113 
Sison, 2 
Sisymbrium, 9 
Sisyrinchium, 154 
Sium, 2 
SmiLacina , see Convallaria 
Smilax, 161 
Smyrnium, 2 
Solanum, 132 
Solea, 74 
Solidago, 113 
Soliva, 113 
Sonchus, 113 
Sophora, 45 
Sorbws, see Pyrus 
Sorghum, 171 
Sparganium, 166 
Sparganophorus, 113 
Spergula, 81 
Spermacoco, 115 
Spigelia, 121 
Spirsoa, 4 1 
Stachys, 138 
Stan ley a, 9 
Staphylea, 60 
Starkea, 113 
Statice, 110 
Stellaria, 81 
Stenotapbrum, 171 
Stevia, 113 
Styllingia, 55 
Stipa, 171 
Stipulicida, 162 
Stokesia, 113 
Streptopus, 161 
Struthiopterus, 174 
Stuartia, 21 
Stylandra, 118 
Siylophorum ., see Meconopsis 
Stylosanthes, 45 
Styrax, 100 
Subularia, 9 
Swertia, 120 
Swietenia, 65 
Syena, 159 
Symplioria, 116 
Symplocarpus, 167 
Synandra, 138 
Talinum, 83 
Tanacctum, 113 
Taxus, 145 
Tellima, 24 
Tepbrosia, 45 
Tetragonotheca, 113 
Teucrium, 138 
Thalia, 156 
Thalictrum, 3 
Thapsia , see Cymopterus 
Thaspium 2 
Thermia, see Thermopsis 
Thermopsis, 45 
Thesium , see Comandra 
Thlaspi, 9 
Thuya, 145 
Thymus, 138 
Tiarella, 24 
Tigarea, see Purshia, 
Tilia, 20 
Tillaea, 85 
Tillandsia, 148 
Tipularia, 155 
Tofieldia, 158 
Tradescantia, 146 
Tragopyrum, 92 
Tragia, 55 
Trepocarpus, 2 
Tribulus, 69 
Trichonema, 154 
Trichodium, 171 
Trichochloa, 171 
Trichophorum , see Eriopho- 
rum 
Trichophyllum, 113 
Trichostema, 138 
Tridens, 171 
Trientalis, 127 
Trifolium, 45 
Triglochin, 169 
Trigonella , see Hosackia 
Trillium, 161 
Triosteum, 116 
Triphora, 155 
Tripsacum, 171 
Triptarella , see Burmannia 
Trisetum, 171 
Triteleija, 160 
Triticum, 171 
Trollius, 3 
Troximon, 113 
Turritis, 9 
Turnera, 76 
Tussilago, 113 
Typha, 166 
Udora, 145 
Ulmus, 47 
Uniola, 171 
Uraspermum, 2 
Uralepis, 171 
Urtica, 46 
Utricularia, 128 
Uvularia, 161 
Vaccinium, 103 
Vaginaria, 172 
Valeriana, 112 
Valerianella, 112 
Vallisneria, 145 
Veratrum, 158 
Verbascum, 132 
Verbena, 137 
Verbesina, 113 
Vernonia, 113 
Veronica, 130 
Vesicaria, 9 
Viburnum, 116 
Vicia, 45 
Villarsia, 120 
Viola, 74 
Virgilia, 45 
Viscum, 117 
Vitis, 63 (a) 
Vittaria, 175 
Wendlandia , see Cocculua 
Windsoria, 171 
Wisteria, 45 
Woodsia, 174 
Woodwardia, 174 
Xanthium, 113 
Xerophyllum, 158 
Xanthoxylum, 68 
Xylosteum, 116 
Xyris, 147 
Zamia, 142 
Zannichellia, 168 
Zanthorhiza, 3 
Zapania, 137 
Zea, 171 
Zigadenus, 158 
Zinnia, 113 
Zizania, 172 
Zizia, 2 
Ziziphus, see Berchemia 
Zornia, 45 
Zostera, 168 
