26 BOTANICAL OEOGJRAPHY. 



liar Genera Clethra^ Fothergila^ Passiflora^ 

 Chionanthus^ Lantana^ Marshallia^ Xerophy- 

 lum^ Pinkneya^ Halesia^ Leiophylum^ Hudso- 

 nia, &/C. with many species of Ilex^ Ludwigia^ 

 Khexia, Viburnum, Lobelia, Slc. 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 Pacan- 

 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 Miegia, Collinsia, Bellis, Leucospora, 

 &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 abundance of Cactides and 

 Canebrakes. The floral season lasts nearly the 

 whole year as in Florida. 



7. Origon Region. This extends over the 

 Origon mauntains and the hilly country west 



