My research is focused on the evolution, systematics, and historical biogeography of plants. Study objects are desert poppies, desert sunflowers, juniper trees and other Cupressaceae, and diverse tropical mangrove plant groups. My work involves molecular and traditional plant systematic techniques, including DNA sequencing, molecular fingerprint techniques, genetic mapping, ecophysiological methods, and morphological and anatomical techniques. Laboratory work is complemented by field studies and collection expeditions conducted in the southern regions of the U.S. and in various tropical regions of the world. Results of my studies are used to reconstruct the origin and spread of plant species in time and to understand adaptive changes during speciation accompanied by occupation of new habitats. Phylogenetic, population and conservation genetics data are used for management of rare plant species. A second line of research is concerned with medicinal plants, especially those that are used in the Rio Grande Valley.

Undergraduate and graduate students (master degree in biology) who are interested in research are encouraged to contact me.