ALTAMAHA GRIT REGION OF GEORGIA 89 



and one fungus. Only 17.6% of the angiosperms (about the 

 same proportion as in dry pine-barrens) are monocotyledons, 

 which seems to indicate that the sand-hill flora is pretty highly 

 specialized. 



The following families have at least two more representatives 

 on the sand-hills than in the dry pine-barrens : Caryophyllaceas, 

 Illecebraceae, Polygonaceas, and Commelinaceas. The reverse 

 is true of Compositae, Polygalaceae, Cupuljferae, and Gramineae. 



In range the sand-hill plants are more restricted than those 

 of dry pine-barrens. Those peculiar to the sand-hills are nearly all 

 confined to the coastal plain, and conversely, those whose ranges 

 cross the fall-line nearly all occur also in dry pine-barrens. Most 

 of the characteristic sand-hill plants do not range farther north 

 than North Carolina or farther west than Mississippi. (This 

 throws an interesting side-light on the geographical distribution 

 of coastal -plain sand-hills.) About two-thirds of the whole list 

 occur also on the fall-line sand-hills of Georgia (according to notes 

 from Richmond County furnished by Mr. A. Cuthbert, and my 

 own observations there and elsewhere along the fall-line). 



A few of the species listed are not yet known outside of 

 Georgia, and at least one of these {Dicerandra odoratissima) is 

 perhaps really confined to the state. Only one species in the 

 list is known from the tropics, and that (Dendropogon usneoides) 

 is an epiphyte, by no means confined to sand-hills. 



In descending from the summit of a sand-hill toward the creek 

 at its base, we may pass through either of two series of inter- 

 mediate habitats, bogs or hammocks. Approaching a springy 

 place in the sand-hills, or a branch passing through them, we 

 usually encounter first a slightly damp area, analogous to the 

 intermediate (rather dry) pine-barrens on the other side of the 

 creek. For want of a better designation this may be called 



13. Intermediate Sand-Hills. 



The flora of such habitats is rather meager, and not sharply 

 distinguished from those on either side of it. The following 

 species are characteristic. 



2 Pinus serotina 3-4 — 



5 Kalmia hirsuta 6-9 purple 



