INDEX OF PLATES. 



Plate. 



^Egopogon geminiflorus 12 



Andropogon cirrhatus 18 



hirtiflorus 19 



saccharoides 20 



Wrigbtii 21 



Aristida Arizouica 22 



divaricata ,23 



Bouteloua arenosa 34 



aristidoides • 35 



Burkei 36 



eriopoda 37 



Havardii 38 



hirsuta 39 



Humboldtiana 40 



oligostachya 41 



prostrata 42 



raceinosa 43 



ramosa 44 



stricta 45 



trifida 46 



Buchloe dactyloides 47 



Cathestecum erectum 13 



Cenchrus nryosuroides 6 



tribuloides 7 



Chloris alba 29 



ciliata 30 



cucullata 31 



glauca 32 



verticillata 33 



Elionurus barbiculmis 15 



Epicampes ruacroura 27 



rigens 28 



Eremocbloe Bigelovii ■ 48 



Kingii 48 



Eriochloa sericea 1 



Heteropogon contortus 16 



Hilaria cenchroides 10 



mutica 11 



Melica diffusa 49 



Porteri 50 



Muhlenbergia distichophylla 25 



gracilis 26 



Panicurn bulbosum 2 



ciliatissimum 3 



lachnanthum 4 



Setaria caudata 5 



Stenotaphrum Americanum 8 



Stipa flexuosa 24 



Thurberia Arkansana 9 



Tracbypogon polymorphus 17 



Tragus raceruosus 14 



7 



