Abstract
In southeastern United States, a region where the zonal vegetation is deciduous forests, shallow soils over limestone and dolomitic bedrock support edaphic climax herbaceous plant communities known as cedar glades. The flora includes over 400 species of vascular plants; 79 of these are winter annuals and 47 are summer annuals. This chapter reviews the life cycle ecology of both groups of therophytes in the cedar glade habitat in relation to their tolerances, requirements and adaptations. Temperature, through its influence on seed dormancy, dormancy break and germination, is the single most important environmental factor regulating the timing of the life cycle of annual plants of cedar glades.
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