228 



Trans. Acad. Sci. of St. Louis. 



Salix 60 ; 68, 168, pi. 7 



Salvia 65 



Salvinia (163, 166) 



Sambucus 68 



Sanguinaria 69 



Sanicula 69 



Santalum 169 



Sapindus 172 



Schedonnardus 64-5 



SchraDkia 65 



Scirpus 59, 66 



Scolocloa 209, 217 



Scrapta (47) 



Scrophularia 69 



Scutellaria 61 



Secale 200, 212, 214, 217-9, pi. 18 



Segmentiua 90 



Selenites (79) 



Senecio 60,64 



Sequoia 164 



Setaria 200, 204, 217-9. pi. 18 



Sicyos 68 



Silene 65 



Silphium 65 



Smilacina 69 



Smilax 68 



Solarium 64-5 



Solidago, 64-6, 68-9 



Somatogyrus 93 



Sophora 64 



Sorbus 29 



Sorghum 203, 217-8, 220, pi. 19 



Sparganium 59 



Spartina 67 



Sphaerium 78-9 



Sphecodes 45 



Sphenopterie 163 



Spiraea 178 



Spirodela 57 



Spirogyra 90 



Sporobolus 62, 64, 200, 207, 220, 



pi. 19 

 Stanleya 61 

 Staphylea68, 172 

 Stelis 48 

 Stenosiphon 60 

 Sterculia 172, 180, 188, pi. 14 

 Stillingia 63 



Stipa G3, 65, 205-6, 217, 219, pi. 11 

 Strigula 197 

 Strobila (85) 



Strobilops 85 

 Strophitus 76 

 Strophostyles 62 

 Stylosanthes 65 

 Suaeda 66 

 Succinea 87 

 Symphoricarpus 61, 68 



Tachea 85 



Talinum 63 



Taxodium 25, 164 



Teucrium 69 



Thalia xxiv 



Thaspium 43 



Thelesperma 64 



Thuites 164 



Tilia 27-8, 39, 68, 172, pi. 9 



Tillandsia 192, 196 



Tmesipteris 163 



Tragia 60 



Triodia 62 



Triosteum 69 



Trisetum 217 



Triticum 200, 201, 212-3, 217-220, 



pi. 18,19 

 Typha 59, 73, 164 



Ulmus68, 168, pi. 8 

 Unio 76 (77), 78 

 Uuiola 69 



U.-nea xxv, 189, pi. 16 

 Utricularia 67 

 Uvularia 69 



Vaccinium 171 

 Vallonia 83 

 Valvata 93-4 

 Verbena 64-5, 69 

 Vernonia 66 

 Veronica 69 

 Vertigo 87 

 Viola 69 

 Vitis 68 

 Vitrea 80 

 Vitrina 82 

 Vivipara 94 



Weiomannia 171 

 Widdringtonia 164 

 Wolffia 58 



