GENERAL INDEX OF PLATES. 



iEgopogon geminiflorus . 



Andropogon cirrhatus . . . 



hirtiflorus . . 



saccharoides 



Wrightii .... 



Aristida Arizonica 



divaricata 



purpurea 



Bouteloua arenosa 



aristidoides . . . 



Burkei 



eriopoda 



Havardii 



hirsuta 



Humboldtiana 

 oligostachya . . 



prostrata 



racemosa 



ramosa 



Bouteloua stricta 



triflda 



Buchloe dactyloides 



Cathestecum erecturu , 



Cenchrus myosuroides , 



tribuloides 



Chloris alba 



ciliata 



cucullata 



glauca 



Swartziana 



verticillata 



Cottea pappophoroides I 



Diplachne fascicularis . . I 



imbricata I 



Reverchoni I 



rigida I 



viscida I 



Elionurus barbiculmis .• 



tripsacoides I 



Elymus Sitanion I 



Epicampes macroura 



rigens 



Eragrostis curtipedicellata I 



lugens I 



oxylepis I 



Purshii I 



Eremochloe Bigelovii 



Kingii 



Eriochloa sericea 



Plate. 

 12 

 18 

 19 

 20 

 21 

 22 

 23 

 7 



34 

 35 

 36 

 37 

 38 

 39 

 40 

 41 

 42 

 43 

 44 

 45 

 46 

 47 

 13 

 6 

 7 

 29 

 30 

 31 



