Xo.i.] GRAY AND HOOKER ON TIIE ROCKY MOUNTAIN FLORA. 55 



Atlantic Flora. 



.:. tain Flora. 



-Ac Flora. 



Corylacese. 



c 



C 



LC&S. 



l'xtulaceau 





' 





:cea. 



-. 



ntct. 











Ta^i:. 









mimtm 



[KM. 



. 







:ie«e. 



ntCK. 









Palm ' 



AltM 1 





■ ce. 





J 



I**' III H*l06flB 





Tj^p^ac*«. 







A . 



i<e». 



lIvdiiK h.iriilaOMft. 





II . 



BuriiKiimiacoje. 







■Cfit. 









Orchidacece. 



Orctaidacea. 



. llidaeeae. 



A . 



A . 









IC€4X. 







Ilid.lceJB. 



IndacwB. 



Iridace». 



■nee4x. 







iL'liiace*. 







S * ' fl 1 i ' x ■»!• 



g 



Smilacfcz. 



LlLIACEJB. 





Liliaceae. 



Juuca. 



Jnncacese. 



Juncacea. 



-ae. 





P . 



Xyrida 







Eriooauloneae. 







Ctvbeagbjb. 



Cyperaceoe. 



Cyperaceae. 



Granii: 



Gramiiiese. 



GramLneae. 



The groups in this tabulation, it will be observed, have not all the 

 rank of orders. Such as they are, the— 



Atlantic flora has 156 



Rocky Mountain flora (in most extensive sense) 112 



Pacific flora 127 



But of the groups very slightly represented there is only one in the 

 first, while there are twenty-four in the Rocky Mountain flora and fifteen 

 in the Pacific. If these be omitted the greater diversification of the At- 

 lantic flora will be the more apparent — 



Atlantic orders or groups L55 



y Mountain 88 



Pacific . 112 



Ajb to the numerical extent, respectively, of these three great divisions 

 of the United rould be attainable only through 



much labor; and an approximation is nearly as valuable U would be a 

 close count from present and still changing data. Hann'e Catalog 

 the Phaenogamous Plants of the United Stat* : the Mississippi, 



be taken for the Atlantic flora, excluding for our purpose the intro- 

 duced species and those of the Florida peninsula. The official Botany 

 difornia, mainly by S. Watson, now just completed, includes or men- 

 it«-r pari of the Pacific species and genera, but incl 

 many whirl), though indigenous to that State or near its borders, really 

 an only to the flora of the interior basin. Mr. Watson's careful 

 elaboration of the botany of this basin and its borders, presented in bis 

 volume v. of Clarence I Explorations and 8ui the For- 



Parallel, sums up and analyzes the v< n of this district; but 



