2002/08/01 by J. Chris Pires, Kenneth J. Sytsma · 5 citations
Agricultural and Biological Sciences · Biochemistry, Genetics and Molecular Biology · #Plant Diversity and Evolution #Botany, Ecology, and Taxonomy Studies #Plant and Fungal Species Descriptions
paper · doi:10.3732/ajb.89.8.1342
openalex publication_date 2002/08/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/29
Phylogenetic analyses of plastid DNA sequences of ndhF, trnL-F intron and spacer regions, and rpl16 are presented separately and combined for 41 taxa from all 12 genera of the Themidaceae and for 20 taxa from nine related families in the higher Asparagales. The results from the combined analysis are the most resolved and provide a high level of support for the monophyly of Themidaceae. Within Themidaceae, the Milla complex of Mexico is supported as monophyletic within a paraphyletic Brodiaea complex of western North America. Four major clades are identified in each of the individual and combined analyses: (1) the Milla complex; (2) Brodiaea, Dichelostemma, and Triteleiopsis; (3) Triteleia, Bloomeria, and Muilla clevelandii; and (4) Androstephium and the other species of Muilla. These well-defined clades suggest that morphological characters (e.g., an extended perianth tube) that have been traditionally used to circumscribe the genera within the Brodiaea complex have evolved independently at least twice. In addition, common biogeographic distribution patterns (e.g., Brodiaea and Triteleia having centers of diversity in northern California and the Pacific Northwest) appear to be the result of separate evolutionary radiations.