Pollen from Lake Annie, Highlands County, south-central Florida, can be divided into three zones. Zone 3, dating from 37,000 to 13,010 B.P., is characterized by pollen of the shrub Ceratiola (rosemary) and Polygonella spp., implying a very dry climate. Zone 2, dating from 13,010 to 4,715 B.P., has abundant pollen of Quercus (oak) and Ambrosia (ragweed), indicating an upland vegetation of oak scrub and prairie. From 4,715 B.P. to the present (zone 1), the modern flora and climate have prevailed.