

362 BOTANICAL GAZETTE [may 



In certain low places, as at the bases of slopes, water may ooze 

 through the sandy soil to collect on the surface in little pools or 

 pockets, with intervening hammocks of dark muck, or may slowly . 

 drain away, sometimes forming the source of a small stream. In 

 this way small branches or considerable tributaries may originate, 

 and by their union form creeks or small rivers. In other cases 1 



sloughs and ponds may be formed, such boggy spots often being 

 designated "galls." In vegetation they resemble the bays, often 

 surrounded by or advancing to a hammock stage by the accumu- 

 lation of humus and the gradual building up of the soil. 



Bayheads scarcely differ from these, also being the sources of 

 small branches. In these, typical trees are Magnolia virginiana L. 

 and Per sea pubescens Sarg., with a bordering shrubbery of more or 

 less mesophytic character. 



Sloughs are low, flat passageways between swamps or bodies of 

 water. In these passageways the water may be still or but slowly 

 moving, while during the dry season they may be entirely dried 

 out. Cypresses, sour gums, swamp pines, and swamp maples are 

 common slough trees, with live oaks, water oaks, holly, and sweet 

 gums on the edges. Swamp shrubs, including a variety of the en- 

 cads, cyrillas, gallberries, hypericums, with the saw palmetto, out 

 of reach of the standing water, are numerous. 



Prairies 



' 



comparable to swamps 

 face and lacking surfac 



may 



times 



vegetation consists typically of herbaceous associations, especially 



grasses. No 



pography under description here, although many 

 l and lakes may temporarily become prairie-like, 

 he dry seasons being overgrown with grasses and 

 which introduced nlants. as weeds, make a mis- 



cellaneous assemblage. 



EROSION TOPOGRAPHY 



The northern part of Leon County, having been exposed prob- 

 ably as long as any other section of Florida or of the immediate Gulf 





