BEARDSLEY, PAUL M.* AND RICHARD G. OLMSTEAD. Botany Department, University of Washington, Seattle, WA, 98195. - A phylogenetic analysis of the genus Mimulus and tribe Mimulueae (Lamiales).
Species of Mimulus are important models for the study of plant
evolution, population biology, and genetics. However, the phylogenetic
relationships among species of Mimulus are not clear, nor is
the relationship of Mimulus to other genera in the tribe
Mimuleae or the position of this group to other families of Lamiales.
The monophyly of the tribe and the seven major sections within
Mimulus were tested using sequences of the nuclear ITS and ETS
regions and the chloroplast leucine tRNA (trnL) intron and the
intergenic spacer between trnL and trnF. Data from over 110 taxa
indicate that the genera Leucocarpus, Hemichaena,
Berendtia, Lancea, and the taxonomically isolated
Phryma are derived from within Mimulus. The Australian
genera Glossostigma and Peplidium are also derived from
within Mimulus, indicating a second regional diversification of
Mimulus in Australia (ca. 20 species), in addition to the
recognized diversification in western North America. Within
Mimulus, sections Diplacus, Erythranthe (plus
M. parishii), and Simiolus (minus M. gemmiparus)
are monophyletic. Sections Mimulus, Eunanus,
Oenoe, Paradanthus, and Mimulastrum are
paraphyletic.
Key words: Lamiales, Mimuleae, Mimulus, Phryma