Abstract
MEHLMAN, D. W. (Department of Biological Science, Florida State University, Tallahassee, FL 32306). Tumbleweed dispersal in Florida sandhill Baptisia (Fabaceae). Bull. Torrey Bot. Club 120: 60-63. 1993.-Tumbleweed dispersal of Baptisia lanceolata (Walt.) Ell. and B. lecontei T.&G. was studied at a Florida sandhill site. The sandhill habitat is characterized by an open canopy of pines with a low ground cover of grasses, forbs, and shrubs. Plants tagged in the late fall were followed through the winter and early spring. The above-ground part of almost all plants examined broke off at the base and plants moved a maximum of 120 m from the growing site. Significant differences in dispersal distance were found between survey dates, and the mean distance moved increased throughout the period. Dispersed plants were concentrated in certain compass quadrants, consistent with wind-aided plant movement. Baptisia lanceolata plants that moved the farthest had fewer pods remaining on them. Wind-aided dispersal of the entire plant appears to be a viable method of long-distance dispersal in these two species.
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