Research in the Johnson laboratory focuses on flowering plant diversity. We use molecular and morphological data to reconstruct phylogenetic relationships, identify patterns of diversification, and describe the genetic basis of traits that distinguish closely related species. Comparative DNA sequencing and comparative morphology allow us to study the evolution of genes and physical traits. Translating this knowledge into taxonomic treatments is an important aspect of this work.

Polemoniaceae (the Phlox family) and several Great Basin endemics provide model systems for addressing a variety of evolutionary and conservation oriented questions. We also have ongoing collaborative research in Patagonia.  Research interests include cryptic species & species delimitation, phylogeny, phylogeography, comparative morphology, and conservation genetics.