Harper: Ox the Flora of South Georgia 415 



is especially noticeable in the case of the grasses); there are more 

 evergreen trees and shrubs and fewer evergreen herbs ; and there 

 are more species of climbing plants and epiphytic spermatophytes. 

 Comparing the representation of various families in the two re- 

 gions, we find in South Georgia more species of Cyperaceae, Or- 

 chidaceae, Nymphaeaceae, Magnoliaceae, Leguminosae, Euphorbi- 

 aceae, Aquifoliaceae, Rhamnaceae, Malvaceae, Hypericaceae, Mela- 

 stomaceae, Onagraceae, Halorrhagidaceae, Loganiaceae, Gentian- 

 aceae, Asclepiadaceae and Rubiaceae ; and fewer species of 

 Cupuliferae, Caryophyllaceae, Ranunculaceae, Cruciferae, Cras- 

 sulaceae, Saxifragaceae, Kosaceae, Violaceae, Cornaceae and 



i 



Labiatae. To illustrate the deficiencies in some of the latter 

 families, I will mention that I have found the Caryophyllaceae (ex- 

 clusive of Illecebraceae) and Cruciferae represented only by a few 

 weeds, the Ranunculaceae only by two or three species of Clematis, 

 and the Saxifragaceae only by the shrubby genus Jtea y with a 

 single species. 



The flora of South Georgia, at least of that part of it which I 

 have explored, seems to be more highly differentiated into plant- 

 communities than that of Middle Georgia. I have recognized 

 twelve or fifteen distinct floral areas in Sumter County alone, and . 

 this number could no doubt be considerably increased by careful 

 study. The plants of this region seem to be more exacting in 

 their requirements for perfect development than those of colder 

 climates, hence there is very little intergradation between the vari- 

 ous plant-communities. 



I will mention first the strictly aquatic plants, which inhabit 

 ponds and streams, either floating free or rooting in the mud. 

 These are found mostly in artificial mill-ponds, for natural ponds 

 in this region are very small and few and far between. The fol- 

 lowing aquatics have been observed in Sumter County : 



Potamogeton diversifolius Raf. Castalia odorata (Dryand.) 



lonchitcs Tuckerm. Woodv. & Wood. 



Elcocharis interstincta (Vahl) R. Myriophyllum heterophyllum Mx. 



& S. Umnanthemum laeunositm 



Lentna minor L. (Vent.) Griseb. 



Brasenia purpurea (Mx.) Cas- aquaticum (Walt.) Britton. 



pary. 



ifiata 



