Mentzelia Canyonensis (Loasaceae), A New Species Endemic to the Grand Canyon, Arizona, U.S.A., John J. Schenk, Wendy Hodgson, Larry Hufford
John Schenk

Taxonomic Novelties from Western North America in Mentzelia section Bartonia (Loasaceae), John J. Schenk, Larry Hufford
John Schenk

Phylogeny and Taxonomy of Mentzelia Section Bartonia (Loasaceae), John J. Schenk, Larry Hufford
John Schenk

Effects of Substitution Models on Divergence Time Estimates: Simulations and an Empirical Study of Model Uncertainty Using Cornales, John J. Schenk, Larry Hufford
John Schenk

A New Species of Mentzelia section Bartonia (Loasaceae) from the Grand Canyon, Arizona, U.S.A., John J. Schenk, Wendy Hodgson, Larry Hufford
John Schenk