

LIST OF ILLUSTRATIONS. 



Facing page 

 Frontispiece. Yucca arborescens in the Mohave Desert. 



Plate I. Aquilegia pubescena 320 



II. Jrctomeeon merrxami *** 



III. Erysimum asperum perenue 3-4 



IV. Isomeris arborea globoea 326 



V. Arenaria compacta 328 



VI. Ccanoihus pinelorum 380 



VII. Potentilla eremica 332 



VIII. (Enothem xyloearpa 334 



IX . Men tzelia rejlexa 336 



X . Orochamactia thysanocarpha 338 



XI. Lepidospart am striatum 340 



XII. Buddlcia ittalieusis 342 



XIII. Frasera tubitlosa 344 



XIV. Nam rretia sctosinsima punctata 346 



XV. I'hacelia perityJoides 348 



XVI. Cryptanthe recurvata 350 



XVII. Mohavea Irerifiora 352 



XVI11. Bccrhavia ann ulata 3o4 



XIX. Atriplex tularenm 356 



XX. Sareobatut baileyi 358 



XXI. Phyllogonum luteolum • 360 



Map I. Map of parts of California, Nevada, Arizona, and Utah 364 



VIII 



