Abstract
Dicerandra christmanii, differing from D. frutescens in anther and corolla color, essential oils, average leaf length, and anther connective glandularity, is described from sclero- phyllous oak-sand pine scrub on yellow, well drained sandy soils near Sebring, in Highlands County, Florida. Its distinctness and phylogenetic placement are substantiated by phenetic analysis of mor- phological features, field study of variability in natural populations, survey of leaf essential oils, SEM study of anther micromorphology, preliminary investigation of pollination biology, garden observations, and a revised cladistic analysis of the genus. The discovery of D. christmanii is indicative of the need for additional taxonomic studies involving the highly endemic flora of the Lake Wales Ridge, a region of extensive and continuing habitat destruction due to agricultural and urban development.
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