Sabal minor (Dwarf Palmetto) is considered one of a handful of cold tolerant palms with the ability to withstand winters as far north as Virginia. Across its native range, S. minor can be found across three different climatic zones: tropical, subtropical, and subtropical/temperate. Unlike other species of Sabal, most populations of S. minor do not form a trunk which may serve as an adaptation to living in extreme habitats. Across the central US Gulf Coast, however, the species becomes variable for trunk type where individuals within populations can be either trunkless or trunked. The trunked phenotype is strongly heritable, and the trunked growth form of S. minor is horticulturally known as ‘Sabal louisiana’. For my dissertation research, I am adopting a population genetic approach to characterize the genetic diversity of S. minor and investigate the evolutionary and ecological processes associated with the geographically restricted trunk polymorphism (trunked/trunkless).