226 



APPENDIX. 



Orders. 



Brought forward . 



Genera. 



Total. 



Elaeagnacese . . . 

 Urticacese . . . 

 Betulaceee . . . 

 Platanacese . . . 



Salicineae 



Euphorbiacese . 



Saurureae 



Juglandese . . . 

 Cupuliferse . . . 

 Loranthacese . 

 Santalacese . . . 



Coniferse 



Gnetaceae 



Orcbidese 



Iridece 



Amaryllidese . 

 Alismaceae . . . 



Naiadese 



Typhacese . . . 

 Liliaeese . . . . . 

 Xerotideae 



Juncacese 



Commelinaceae . 

 Cyperacese . . . 

 Graminese . . . 



Totals. 



447 

 2 

 2 

 2 

 1 

 2 

 5 

 1 

 1 

 2 

 2 

 1 

 6 

 1 

 6 

 2 

 1 

 1 

 2 

 1 



13 

 1 

 1 

 1 

 9 



47 



560 



Common to 

 Mexico. 



320 



2 

 1 

 1 



2 

 4 



1 

 1 



2 

 1 

 4 

 1 

 6 

 2 

 1 

 1 

 2 

 

 7 



i 



l 



8 

 33 



402 



Species. 



Total. 



1149 

 2 

 5 

 4 

 1 



13 



16 

 1 

 1 



10 

 8 

 2 



18 

 2 

 8 

 4 

 3 

 2 

 5 

 2 



23 

 2 



12 

 1 



59 

 120 



1473 



Common to 

 Mexico. 



359 







4 



26 



429 



After these statistics had been obtained, it was discovered that it would have been 

 better to include the whole of Mexico, because a considerable additional number of the 

 Arizona and New-Mexican, plants are known to exist in the more fully explored South 

 Mexico, though they have not been found in the intervening country, where, however, 

 they may be expected to occur. 



Deducting the species of Eanunculacese, Coniferse, Caryophyllacese, Rosacese, Saxi- 

 fragacese, and other orders consisting largely of mountain-plants, the specific affinities 

 even are very pronounced ; but it is chiefly apparent in the genera. The small propor- 

 tion of grasses common to the two areas is remarkable. 



That the Mexican flora covers some part of California and extensively overlaps or 

 intermingles with the peculiarly Pacific flora is certain, but where the boundary should be 

 drawn is not so evident ; indeed, in the absence of more complete data, it is impossible to 

 fix it. At the same time it is also evident that we do encounter a very different vegetation 

 in California ; the characteristic Mexican types are rare, and soon disappear altogether, 

 and their place is taken by a number of other genera. It should be understood that we 



