132 FLORIDA GEOLOGICAL SURVEY-I3TH ANNUAL REPORT

Chemically, most of the soils seem to be pretty well supplied with phosphorus, as would be expected from the occurrence of so much phosphate rock.
 Vcgctation. The vegetation types include flatwoods with and without saw-palmetto (fig. 23), a little high pine land, a few patches of scrub, many cypress ponds (fig 24), wet prairies, high and low hammocks' (fig. 25), various kinds of swamps and bays, and salt marshes along the shores of Tampa Bay. The cypress ponds are chiefly confined to Pasco and Pinellas Counties, the lowliammocks to Hillsborough and Polk, and the high hammocks to the neighborhood of the Peace River. Swamps are not very extensive.


















 Fig. 25. Low hammock near Peace River about two miles southeast of Bartow, showing cabbage palmetto. dwarf palmetto, sweet gum, rattan v~ne, etc. March 13, 1915.

 The commonest plants seem to be as follows, the first tree named being.apparently about 15 times as abundant as' its nearest competitor:
 COM-MONEST PLANTS OF WESTERN DIVISION OF FLATWOr)DS.
 TIMBER TREES
Pinus palustris Long-leaf pine Flatwoods
Pinus Caribaea Slash pine Flatwoods
Taxodium imbricarium (Pond) cypress Cypress ponds
Pinus Elliottii Slash pine Branch-swamps, etc.
Pinus clausa Spruce pine Scrub