163 
1879.] 
Distribution of the North American Flora. 
Valleys of the Mississippi and Ohio 
Obio River. 
i Alleghany 
Mountains, , 
€ 
: 
Site mate 
Wooded region, of chiefly deciduous trees, Many Eastern Asiatic genera, 
E-E 
2 S 
omg DE ulme fp E 
S Range = Desete, or È o& 
Coniferous region, heavily Saline region, nearly treee Grasaed and loosely-timbered coni- Grasced region. 
timbered, with chiefly ever- less, with sage-bush (Arte- ferous — cacti below ; alpine 
green trees, misia). region above. 
w. es — 
Many Mexican genera. 
Section of Nofth American Continent in about Lat, 40°. 
all cross the Arctic circle in other longitudes; 5, some Greenland or : 
Species are confined to it and to the mountains on the Atlantic 
