Geographical Botany of the United States. 19 

 scandens, Scheuchzeria palustris ; several species of Epilobium, 

 Pyrola and Hudsonia, which are not represented in the Southern 

 region, if we except a single species o; Epilobium, found on the 



In passing to the west from the Alleghanies, new vegetable forms 

 appear, though a similarity of latitude prevails. This difference be- 

 comes striking as we cross the Mississippi. In the forests we now 

 find an abundance of the Celtis massif oUa, (hack berry,) Acer nc- 

 gundo, (ash leaved maple,) Qucrcus macrocarpa, (over-cup-oak,) 

 Asimina triloba, (papaw,) several species of Aesculus, (buckeye,) 

 viz: Ae. flava, pavia, macrostachya, &c. the coffee tree, Gymno- 

 cladus canadensis, Glcditschia triacanthos, (honey locust,) Juglans 

 olivcrformis, (peccan,) and J. nigra, Cercis canadensis, (red bud ;) 

 and on the banks of streams, Saliz hngifolia, Populus angulata, 

 (cotton wood.) These, although not all peculiar to this section, form 

 prominent features in its vegetation. Among the more rare produc- 

 tions of the Western forests, we may also mention the Yellow Wood, 

 or Bois d'arc, Madura aurantiaca, Nutt. extending westward to 

 the banks of the Little Missouri, and which is so extensively em- 

 ployed by the natives of that section. Among the more humble 

 plants, the splendid Rosa rubifolia, R. Brown, which is abundant 

 on the margins of prairies, may be adverted to ; as also several spe- 

 cies of Monarda, Penstemon, Oenothera and NuttaTRa, Troxi- 

 mon glaucum, Nutt. and T. marginatum, Collinsia verna, Mahe- 

 nia aquifolum, Nutt. Glycyrrhiza lepidota, NutL (wild liquorice,) 

 found at St. Louis, on the Platte river and Rocky Mountains, 

 and several species of Verbena, &c. &c. 



This varied and interesting vegetation, continues until we reach 

 the chain of mountains which traverse the Western part of our con- 

 tinent, on which, among many alpine plants which are found on 

 the mountains in the Eastern part of this continent, in Europe, and in 

 Asia, are some which are peculiar. But, as has been remarked, 

 our knowledge concerning this tract, is still too limited to warrant 

 any general remarks or comparisons. 



It would be interesting to notice the features of the vegetation in 

 the states on the Gulf of Mexico, viz : Alabama, Mississippi and 

 Louisiana, and to compare them with those of Georgia and South 

 Carolina; but we are still in want of materials for this purpose. 

 Yet, as far as I can judge from a catalogue published under the di* 



