224 



APPENDIX. 



Taking the numbers alone the contrast is not so very striking ; but on examining 

 the composition of the eastern extensions, we find that the number of genera exceeds 

 the number of species, and that very many of the genera and species have a wider 

 range, while the western extensions are mostly common to Mexico only. Moreover, 

 about 40 genera and 70 species, almost exclusively 1 West-Indian types, which only 

 inhabit Southern Florida in North America, should be deducted, bringing the totals 

 down to 517 genera and 482 species. Greater discrimination in tabulating would 

 doubtless lead to further reductions. A noteworthy fact is the much larger proportion 

 of monocotyledons in the eastern extensions, the numbers of both genera and species 

 actually exceeding the western. Allusion has already been made to the large number of 

 monotypic and other genera common only to Mexico and the North-west (see page 216 . 



In order to ascertain with some greater degree of precision the relationships 

 between the flora of North Mexico and the adjoining countries to the north, we have 

 tabulated Eothrock's fragment of the Botany of Arizona &c. 



Statistics of the Flora of Arizona and the contiguous Territories, and its connections 



with the North Mexican. 



Orders. 



Genera. 



Species. 



Total. 



Common to 

 Mexico. 



Total. 



Common to 

 Mexico. 



Ranunculacese 



12 

 1 

 3 

 1 



18 

 4 

 1 

 1 

 1 

 3 

 1 

 8 

 5 

 1 

 1 

 1 

 7 

 2 

 1 

 1 

 2 

 3 

 2 

 1 

 4 

 2 



87 



7 

 1 

 2 

 1 



11 

 3 

 1 

 1 

 1 

 3 

 1 

 6 

 4 

 1 

 1 

 1 

 6 

 1 

 1 

 1 

 2 

 3 

 1 

 

 4 

 1 



65 



36 

 4 

 3 

 1 



43 



10 

 1 

 4 

 1 

 4 

 1 



25 

 9 

 1 

 1 

 1 



15 

 2 

 3 

 1 

 3 

 5 

 2 

 6 

 7 

 3 



192 



6 

 2 

 1 

 

 9 

 3 

 

 

 

 3 

 1 

 3 

 2 

 1 

 1 

 1 

 9 

 1 

 3 

 1 

 3 

 

 1 

 

 3 

 2 



56 



Berberidese 



Papaveraceae 



Fumariaceae 



Cruciferae 



Capparideae 



Cistineae 



Yiolarieae 



Bixineae 



Polygalacese 



Frankeniaceae 



Caryophyllaceae 



Portulaceae 



Elatineae 



Tamariscineae 



Hyperieineae 



Malvaceae 



Sterculiaceae 





Malpighiaeeaa 



Zygophyllacese 



Geraniaceae 



Ptutaceae 



Celastrineae 



Pvhainnacese 



Ampelideae 



Carried forward 





1 



