REGIONS AND AREAS OF DISTRIBUTION. 517 
Table 10. Summary of American distribution as compared 
with the Old World. 
Regions. 
| i Total | Total [Common 
Tribes. A in in a o 
is er! . . PELRA 
Mexican. Qnited pes | andino. | Brazi | Ohilian [aa e World. a; visions, 
ON PS EE NM 
| 
: G. | Sp.| G. |Sp.| G. | Sp.| G. | Sp.| G. | Sp.) G. |Sp.| G. | Sp. G G. | Sp. 
Vernoniacese in 4 bs 3 10 9 3i 8 E 24 | 290| 1 5 29 | 376| 14! 156| 4| 3 
Eupatoriac:se ... 21 | 246| 9 | 53| 6 | 94] 111156| 15 | 189| 7| 41/35, 743| 5| 16 5| 8 
Asteroideze -| 29 | 203| 20 |269| 6 | 27 | 16 |137| 8 |119| 19 |131| 49 | 830| 44| 444| 10 | 8 
Inuloideze......... {11} 32) 71 81| 5|12|18| 51| 12| 28| 8| 81| 27 | 157] 118|-950| 11 | 11 
Helianthoides | 90 | 411| 38 |175| 36 | 79 | 57 |217| 39 |208| 23 | 411125 | 963, 22| 77| 18 | 10 
Helenioidezm ...| 5 201| 12 | 51| 6|15| 8| 32 23| 13 | 23] 59 | 304; 3| 3| 2]... 
Anthemidee ..| 7| 12) 5| 42|... 3| 8| 1| 2| 5| 9|11| 63| 41, 608| 9 | 15 
Senecionides ... 11 | 102) 7 | 54| 4|15| 8/211] 2| 29| 4|103| 19 | 502| 24| 687| 5| 6 
Calendulaceg ...| .., |......| ... SEEN ROS TENERE stia d nidis d ot DU PS Es 
Arctotidem ......] ... ]...... Piero cic c E A e e 
Cynaroidez...... 1| 29 3| 17 we. lio dumm | -e [ane | 1] 5] 8 | 42 37| 972 3: l 
Mutisiacere ...... 5-22 1| E 4|12| 18| 81| 161101 | 27 1176) 38 |. 883| 151 e0 Pr 
Cichoriacee ... 16 | 56| 17 | 711 2| 3| 3| 201 2| 5| 7| 29| 24 | 161| 40| 610 10 | 5 
Total ene BAB E 122 | 114 | 78 |291 |145 dod un: | 972 116 | 602 |420 epis e 18 | 62. 
Nores. 
1. Mexican Region. 
I propose the name of Mexican region for a tract of country 
with a very remarkable Composite character, extending along the 
great north and south chains of American mountains, and chiefly 
on its western declivities, from California to Central America, in- 
cluding the greater portion of both. I am unable at present to 
give it any more definite limits. I have no doubt that materials 
from which a general line could be drawn might be extracted from 
the numerous Boundary Surveys of the United-States Expedi- 
tions; but that would be a labour which we could only hope to 
see achieved within a reasonable time by Americans themselves. 
It is chiefly from a general estimate of the recorded areas of the 
species we possess, that I would exclude to the north the Oregon 
territory and northern Rocky Mountains, as characterized by the 
Asteroid Gnaphaloid Artemisioid and other mountain-races con- 
necting North-American with Asiatic Composites; and to the 
west the greater part of Texas, as showing, in their Rudbeckioid 
Helianthoid and other races the characters of the United States 
rather than of the Mexican region. In the intermediate Salt- 
Lake region, the limits between the western and eastern Compo- 
site floras would seem, by Mr. Serene Watson's ‘ Introduction to 
the Nevada and Utah Flora, to lie in the Washoe Mountains of 
Western Nevada. To the south, the Composite of the tierra fria 
