Evolution of Atlantic coastal plain. 213 
formation, the sphagnum swamp formations, the salt-marsh formations of the 
sea strand’). Similarly Kearney for Ocracoke Island, North Carolina”) has 
emphasized the great diversity of the plant covering of that part of the country 
and for the Dismal Swamp region. 
MOHR °) gives an exhaustive treatment of the flora of Alabama and in his 
treatise on the subject discussing the flora of the coastal plain proper empha- 
sizes in his classification the diversification of the plant formations. The same 
great diversity of plant formations is noticeable, according to BRAY, in the 
forests of eastern Texas*), who distinguishes swamps and bayou forests, chiefly 
a 
+ 
1} 
Fig. 5. Cypress Swamp Formation. Prominent trees of the foreground are Taxodium 
distichum and Nyssa uniflora. Pearl River, Mississippi. 
(Arkansas-Louisiana District of the Atlantic-Gulf Coastal Region.) 
1) HARSHBERGER, J. W.: An ecological Study of the New Jersey strand Flora. Proceedings 
Academy Natural N of Philadelphia. Oct. 1900: 623—671. Additional Observations on 
the Strand Flora of New Jersey I. c. Oct. 1902: 642 669. 
2) KEARNEY, THOMAS H.: The plant Covering of Ocracoke Island. Contributions from U. S. 
National Herbarium V, No. 5: 269. Report on a botanical Survey of the Dismal Swamp. Region. 
do. V, No. 6: 359. 
3) MOHR, CHARLES: Plant Life of Alabama. Contributions from U. S. National Herbarium, 
Vol. VI, 1901: 110—133. 
4) Bray, Wırrıam L.: Forest Resources of Texas-Bulletin 47, Bureau of Forestry U. S. De- 
partment of Aeichlare 1904: 15 — 
