26 
BOTANICAL GEOGRAPHY. 
liar Genera Clethra , Fothergila , Passifloro , 
Chionanthus , Lantana , Marshallia , Xerophy - 
lum, Pinkneya , Halesia , Leiophylum , Hudso - 
ma, &c. with many species of JZex, Ludwigia , 
Rhexia , Viburnum , Lobelia , &c. Here the 
Mosses, Lichens and Fungi greatly decrease, 
while the grasses, rushes, ferns, aroides, lilies 
and akin greatly increase. It is the richest of 
our Botanical regions in Species, and Vegeta- 
tion is unceasing, there are flowers in every 
month, even in January. 
5. Louisianian or Missourian Region . 
The actual state of Louisiana hardly belongs 
to this; but the ancient Louisiana is the nu- 
cleus of it, extending into the plains of Tennes- 
see, Kentucky, Illinois, Arkansas, Missouri, 
and up into the vast plains of the Upper Mis- 
souri. The cradle of it appears to be the Ozark 
mountains. It is distinguished by the Paean- 
tree, the Bowtree, the Amorphas, the Planera , 
Cladrastis , peculiar Pavias and Poplars ; with 
abundance of Cacti and Ferns; but scanty 
Mosses, Lichens and Fungi : with the peculiar 
Genera Collinsia , Beilis , Leueospora , 
&c. Floral season from March to November. 
6. Texian Region. This extends over the 
wide plains between Louisiana and Mexico, 
and probably over New Mexico : the nucleus 
may be the Taos mountains ; botanical spurs 
extend into Arkansas and the Colorado Valley. 
It is very little known as yet, but the produc- 
tions are intermediate between Mexican and 
Louisianian, with abundanee of Cactides and 
Canebrakes. The floral season lasts nearly the 
whole year as in Florida. 
7. Origon Region. This extends over the 
Origon mountains and the hilly country west 
