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ILLUSTRATIONS. 



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I* LATE 



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VIII. 



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XII. 

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XVII. 

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XXVL 



X XVII. 



XXVIII. 



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XXXL 



XXXIII, 



XXXIV. 



XXXVI. 



XX XVII. 

 XXXVIII. 



PLATES. 



Facing ^m^o. 



Festuca coii/itsn Piper ' Frontispiece, 



Festum eriolepis Desv 1-t 



Fesluca gnnji (Abrams) Piper H 



Festuca rcflexa Bai;lvl 15 



Festuca megalura Xutt 17 



Festuca hromoides L 18 



Festuca sciarea Xutt 19 



Festuca occidentalis Hook 24 



FeMuca hrnvellil Vasev 31 



Festuca aristulata (Torr, ) Phear 32 



Festuca tliuvherl Vasey 38 



Festuca johusoni Vasey 35 



Fesluca suhuUJlora Scribner 36 



Festuca ehneri Scribn. & Merrill 37 



Festuca covjhiis Vasey 41 



Fchlnocaclus robustus Link & Otto and Mamillar'ta amjalarls 



Link k Otto 83 



Opunfia tunicata Link & Otto and Krhmocactu^ h)grvi^ Zncc 83 



Filocereus fiilvlceps Weber , 83 



Cereus IwUkunis Coulter ,- S3 



Cereus sfellalus Pfeiffer 83 



Cereus weherl Coulter - ^4 



Fouquieria sphiosa IL B. K S5 



Beaucamea oedipus Rose 88 



CaUbemus caesptfosns ( Scheid w. ) Ro.se M 



Callbanus caespitosas (Scheid \v. ) Ro.se 90 



Potentilla lozani Rof^e & Painter 95 



Alchemilla procumhens Rose 93 



Pithecolob'nnn rcrolutum Rose 96 



Hoffmanseggia avida Rose 98 



Bentharnantha jmmUa Ro?e - 99 



Cologanla tenuis Rose 100 



Odonia incana Rose. ..' r 102 



Odonla virtdiflora Rose 103 



Sphinctosperm mn constrictatn (S. AVats. ) Rose 107 



lonoxaUs confusa Rose, J. furcala Rose, and 7. jaUscaua Rose 110 



Tevehinihus arida Rose 118 



Polygala cnlcicola Rose 122 



Pohjgala nehov! Rose - 122 



Polygala tnrglda Rose 123 



