Botany and Zoology. 291 



more to the southern or western regions, and some extend onty to the edges 

 of some of the floral districts: 8 species. 



2. Species peculiar to the flora of the Northern and Middle States. I refer 

 here a single species, E. Geyeri, somewhat artificially it must be confessed, 

 because it more properly belongs to the northwestern Prairie region ; but thus 

 far it has been found nowhere but in northern Illinois and in Wisconsin: 

 1 species. 



3. Species common to Gray's and Chapman's district : 6 species. 



4. Species peculiar to the southeastern flora : 8 species. 



5. Species common to the southeastern and the western flora : 3 species, 



6. West Indian species extending into Florida: 4 species. 



7. Species peculiar to the western and southwestern Prairie flora : 19 species. 



^- Species peculiar to the Mountain region of the west and southwest; 

 ' 7, undoubtedly extend into Mexico : 20 





10- Mexican species extending into the last region: 3 speci 



11. Species common to the western Mountain region and 

 t^acific slope : 2 species. 



12. Species peculiar to the Pacific slope : 3 species. 



