INDEX OF PLATES. 



Plate. 



^Egopogon gerniniflorus 12 



Andropogon cirrhatus 18 



hirtiflorus 19 



saccharoides 20 



Wrightii 21 



Aristida Arizonica 22 



divaricata 23 



Bouteloua arenosa 34 



aristidoides 35 



Burkei '. 36 



eriopoda 37 



Havardii 38 



hirsuta 39 



Humboldtiana : 40 



oligostachya 41 



prostrata 42 



racemosa 43 



ramosa 44 



stricta 45 



trifida '. 46 



Buchloe dactyloides 47 



Cathestecum erecturn 13 



Cenchrus myosuroides 6 



tribuloides. ; 7 



Chloris alba 29 



ciliata 30 



cucullata 31 



glauca 32 



verticillata 33 



Elionurus barbiculmis 15 



Epicampes macroura 27 



rigens...... .. 28 



Eremochloe'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 



Panicum bulbosum 2 



ciliatissimum 3 



lachnanthum 4 



Setaria caudata 5 



Stenotaphruin Americanum 8 



Stipa flexuosa 24 



Thurberia Arkansana 9 



Trachypogon polymorphus 17 



Tragus racemosus 14 



7 



