224 



Trans. Acad. iSci. of St. Louis. 



INDEX TO GENERA. 



Abies 37, 190 



Abronia 63 



Acacia 176 



Acer 26-7, 34, 39, 68-9, 172, 181, 



1S8, pi. 4, 6, 8, 9,11 

 Acorus 73, 164-5 

 Actiuella 59, 61 

 Actiuomeris 69 

 Adiantites 163 

 Afcgilops 217 

 Aesculus 68 

 Agrimonia 69 

 Agropyrum 66, 217 

 Agrostis 205, 207, 217 

 Ailanthus 177 

 Aira208, 217 

 Alasraodonta 75 

 Alisma 59 

 Allium 64 

 Alnus 166 



Alopecurus 205, 207, 217 

 Amaranthus 62 

 Ambrosia 63-4, 66, 69 

 Amelanchier 176 

 Ammanuia 59 



Ammophila 62, 205, 207, 217 

 Amnicola 93 

 Amorpha 63, 68 

 Amphiachyris 60-1 

 Amphicarpaea 68 

 Amygdalus 176 

 Ancylus 90 

 Andrena 46-7 

 Andromeda 171 

 Andropogon 63-4, 200 (203), 217 



(220) 

 Androsace 66 

 Anemone 65 

 Anodonta 75 

 Anodontopsis 76 

 Antennaria 69 

 Antholithes 177 

 Anthoranthum 205, 217 

 Apios 68 

 Aplexa 91 



Aplopappus 62, 64 



Apocynophyllum 170 



Aralia 171 



Arisaema 69 



Aristida 64, 205, 217-9, pi. 18 



Arrhenatberum 200, 208, 217, 219, 



pi. 17 

 Artemisia 62-4 

 Arundinaria 216-9, pi. 17 

 Arundo 209, 217 

 Asarum 69 

 Asclepias 62-5 

 Asclepiodora 65 

 Asimina 68 

 Aspleniura 163, 177 

 Aster 60-1, 66, 69 

 Astragalus 60-1, 64-5 

 Atriplex 66 

 Avena 208, 217-8, 220, pi. 19 



Bacillus XX 



B inksites 169 



Baptisia 65 



Berula 59 



Betula 166 



Bideus 69 



Bombax 177 



Bouteloua 60, 64-5, 200, 208, 217, 



220, i^L 19 

 Brachypodium 200, 209, 212, 217 

 Bromus 200-1, 209, 212, 217, 219, 



pi. 18 

 Buchloe 64-5 

 Buraelia 170 

 Bythinia 92, pL 10 



Cacalia 69 

 Caesalpinia (176-7) 

 Calamagrostis 205, 207, 217 

 Calathea xxiv 

 Callicoma (165) 

 Calliopsis 48 (49, 50) 

 Callirrlioe 65 

 Callitriche 58 

 Camassia 60-1 



