134 FLORIDA GEOLOGICAL SURVEY-I3TH ANNUAL REPORT
Tiflandsia fasciculata Air-plant Cypress ponds mostly
Osmunda cinnamomea (A fern) Swamps and bays
Sagittaria lancifolia Marshes and wet prairies
Actinospermum angustifolium Dry pine lands
Anchistea Virginica (A fern) Cypress ponds, etc.
Polygala Rugelii Flatwoods
Helianthus Radula Flatwoods
Sporobolus gracilis (A grass) Pine lands

 About 88% of the trees and still more of the shrubs are evergreen. Plants of the heath family are, less abundant here than in some other flatwoods regions that have less fertile soils. The pines have been very largely exploited for lumber and naval stores, as usual.
 Population. A rough approximation of the population conditions may be arrived at by subtracting the figures for Tampa and West Tampa from those for Hillsborough County (which included Pinellas up to 191 I). On this basis there were in 1910 nearly 25 inhabitants per square mile, 12.8% of them in cities of over 2,500 population, 71.6% native white, 8.6% foreign white, and 19.7% negroes. (The foreign whites included a few hundred Greeks at Tarpon Springs, which is in a different region, and now in a different county.) In the population over 10 years old 1.7% of the native whites, 19.9% of the foreign whites, and 19% of the negroes were illiterate.
 Excluding Tampa, which belongs partly to a different region, and West Tampa, which is separated only by an imaginary line, the largest cities and towns in 1915 were St. Petersburg, with 7,186 inhabitants- Bartow, with 3,412; Plant City, 3,229; Fort Meade, 2,1-50; Mulberry, 1,121; Port Tampa City, 1071; Largo, 552; and Bradley, 295. The returns from the 1920 census, as far as available, give these places the same relative rank, and St. Petersburg nearly double the population. But these figures should be used with some caution, for St. Petersburg is one of the most popular winter resorts in Florida, and the 1915 census was taken in July and that of 1920 in January. Oldsmar, in the eastern edge of Pinellas County, which was not on the map at all in 1915, may be larger now than some of the places listed.
 Agriculture. The flatwoods region includes less than half of Pasco and Polk Counties, and Pinellas did not exist in 1910, so that the best we can do for agricultural statistics is to use the figures for Hillsborough County. A considerable part of that be-