Overview
My research emphasizes woody plants, especially the systematics of Fagaceae (the oak family), Juglandaceae (the walnut family), and related wind-pollinated families of flowering plants (Fagales). Our lab uses DNA sequences to generate hypotheses of phylogenetic relationship for inferring morphological character evolution, analyzing patterns of biogeography, and testing species concepts. Students and postdocs have studied the systematics and diversification of the following angiosperm families: Acanthaceae, Nyctaginaceae, Zingiberaceae, Rhamnaceae, Montiaceae, Humiriaceae, Solanaceae, Convolvulaceae, Piperaceae, Ericaceae, and Dilleniaceae. Current research interests involve a range of evolutionary and ecological questions within the Fagaceae. For example, we have reinterpreted cupule evolution in the Fagaceae and calibrated the phylogeny for the American clades of Quercus. Ongoing collaborations with Andrew Hipp, John McVay, Andy Crowl, Antonio González-Rodríguez, and Jeannine Cavender-Bares seek to integrate phylogenetic data with phenotypic traits and functional genes to explain species distributions and to better understand the adaptive nature of introgression in the oaks. Other research interests include the phylogeography of eastern North American woody plants, and patterns of speciation via polyploidy in the true blueberries, Vaccinium section Cyanococcus (with Andy Crowl, Hamid Ashrafi, and Peter Fritsch).
Current Appointments & Affiliations
Professor in the Department of Biology
·
2010 - Present
Biology,
Trinity College of Arts & Sciences
Recent Publications
Teasing apart the sources of phylogenetic tree discordance across three genomes in the oak family (Fagaceae).
Journal Article BMC plant biology · July 2025 BackgroundGene tree incongruence is a well-documented, but the biological and analytical factors driving phylogenetic discordance remains incompletely understood. In this study, we investigated how different factors contribute to incongruence amon ... Full text CiteIntrogression, Phylogeography, and Genomic Species Cohesion in the Eastern North American White Oak Syngameon.
Journal Article Molecular ecology · June 2025 Hybridization and interspecific gene flow play a substantial role in the evolution of plant taxa. The eastern North American white oak syngameon, a group of approximately 15 ecologically, morphologically and genomically distinguishable species, has long be ... Full text CiteA global blueberry phylogeny: Evolution, diversification, and biogeography of Vaccinieae (Ericaceae).
Journal Article Molecular phylogenetics and evolution · December 2024 Vaccinieae is a morphologically diverse and species-rich (∼1430 species) tribe in Ericaceae. Although the majority of diversity is tropical, Vaccinieae are best known for temperate crops (i.e., blueberries, cranberries, and lingonberries) in Vaccinium. Vac ... Full text CiteRecent Grants
Dimensions US-China: Collaborative Research: Consequences of diversity in Asian and American oak syngameons for functional variation, adaptation and symbiont biodiversity
ResearchPrincipal Investigator · Awarded by National Science Foundation · 2021 - 2026Collaborative Research: A phylogenomic and morphological investigation into polyploidy and cryptic diversity in the true blueberries (Vaccinium section Cyanococcus)
ResearchPrincipal Investigator · Awarded by National Science Foundation · 2020 - 2025Collaborative Research: Automated and Community-driven Synthesis of the Tree of Life
ResearchPrincipal Investigator · Awarded by National Science Foundation · 2012 - 2018View All Grants
Education, Training & Certifications
Cornell University ·
1992
Ph.D.
Rutgers University ·
1986
M.S.
Drew University ·
1982
B.A.