Inselbergs are terrestrial, island-like rock outcrop environments that present a highly
adapted flora. The epilithic bromeliad Encholirium spectabile is a dominant species
on inselbergs in the Caatinga of northeastern Brazil. We conducted a population genetic
analysis to test whether the substantial phenotypic diversity of E. spectabile could
be explained by limited gene flow among populations and to assess the relative impact
of pollen vs. seed dispersal on the genetic structure of the species.