112 HARPER 



Pimis serotina 



Rhus radicans 



Rudbeckia foliosa® 

 Erianthus strictus1|. 

 Ludwigia microcarpa 

 Iris versicolor If 

 Dichromena coloratal/. 

 Helenium autumnale 

 Eryngium Virginianumlf 

 Boltonia diffusa 

 Manisuris rugosaTj 

 Elionurus tripsacoidesTf 



About another mile farther on in the same direction, between the 

 sand-hills and swamp of Little River, is another peculiar piece 

 of rich woods, but I have not enough notes on its flora to give a 

 list here. (Chimaphila maculata grows there, among other things.) 1 



These three lists combined contain 57 species representing 

 53 genera and 35 families: Compositae, with seven species, being 

 the largest family. Just about one-fourth of the species have not 

 been observed anywhere else in the Altamaha Grit region. The 

 remainder mostly grow in hammocks or on river-bluffs, or a few in 

 swamps of various kinds. Their ranges present no marked 

 peculiarities, except that, as in the case of hammocks and bluffs, 

 more of them range northward than coastward. But seven or 

 eight of them are reported from the West Indies or other parts of 

 tropical America, which is rather significant. 



A large proportion of the species are known to have a decided 

 fondness for limestone, and the conclusion is irresistible that there 

 is some geological peculiarity about these spots where they grow. 

 It is extremely likely that the Lafayette formation is absent here, 

 and possibly the Altamaha Grit also, allowing the underlying 

 calcareous formations to approach the surface. This conclusion 

 is strengthened by the fact that many if not most of these plants 

 grow also in places where the Lafayette and Grit are evidently 

 absent. A moist thicket in the Lower Oligocene region near 

 Leslie contains a flora very similar to that enumerated in the 

 first of these three lists, and probably for the same reason. Just 

 why the calcareous strata should be so near the surface in these 

 places is not clear, for there is apparently no topographic 



•See Bull. Torrey Club, 31: 24. 1904. 



