Abstract
MENGES, E. S. (Archbold Biological Station, P.O. Box 2057, Lake Placid, FL 33852). Habitat preferences and response to disturbance for Dicerandrafrutescens, a Lake Wales Ridge (Florida) endemic plant. Bull. Torrey Bot. Club. 119: 308-313. 1992.-The restricted endemic Dicerandra frutescens Shinners (Lamiaceae) is known from iewer than a dozen localities on the Lake Wales Ridge, Florida. A study of all known populations revealed that this species is virtually restricted to excessively-drained yellow sands in areas that support evergreen oak-dominated scrub vegetation. Microhabitats supporting individual plants have lower litter cover and depth, and greater sky opening, than microhabitats lacking D. frutescens, and tend to be dominated to a greater extent by herbaceous species. Spring fire, defoliation, or removal of aboveground tissues killed 100% of Dicerandra frutescens individuals in field experiments. Control mortality rates for the six-month period were 38-54%. D. frutescens populations recruited following fire from seed stored in the soil. The sensitivity of this narrow endemic to loss of aboveground tissue is consistent with its recently described chemical defense.
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