208 FLORIDA GEOLOGICAL SURVEY-13TH ANNUAL REPORT

probably not more than 5% being under cultivation at the present time.
 "Cutthroats". In the eastern part of Polk County, about on the line between the lake region and the flatwoods, there are several examples of a little-known habitat or type, of vegetation called locally by the above name. It seems to have been first made known to scientific readers by Prof. C. V. Piper about three years ago.* About two years later some of it was pointed out to the writer, who made a hasty examination while his host's automobile waited. A cutthroat seems to be a place in the flatwoods kept perpetually moist by water seeping out from slightly higher ground near by, and is almost the only thing in central Florida comparable with the boggy slopes that are a characteristic feature of the West Florida pine hills.t The trees are mostly slash pine, and the bulk of the herbage seems to consist of "cutthroat grass" (Panicium Coimbsii, also found in WVest Florida). According to Prof. Piper this grass is reputed to be good forage for steers but not for calves, and it is supposed to cause "salt sickness" among cattle.
 High pine land (figs. 9, 10, 19). This is one. of the most extensive types of vegetation in central Florida, covering perhaps ninetenths of the lime-sink region and three-fourths of the lake region, and considerable parts of most of the others. Typically it consists of long-leaf pine, with a lower story of black-jack, turkey, and occasionally other oaks, a sprinkling of saw-palmetto and other shrubs but no woody vines, and a moderately dense carpet of wiregrass and other herbs. Either the oaks or the shrubs may be absent from many acres, though. The, oaks are commonest on the highest and driest uplands, and they seem to increase in abundance after logging operations, perhaps chiefly because the removal of the pines allows the soil to become drier; but they are almost wanting in some places where nearly all the pines have been removed, as in the hardrock phosphate country. The characteristic plants of high pine land in the lime-sink region have been listed in the Seventh Annual Report (pp. 166-167), and that in the lake region does not differ much.


 *Jour. Am. Soc. Agronomy 10 :162-164. April, 1918.
 tSee 6th Annual Report, pp. 232-233.