Abstract:

As currently delimited, Solidagininae are a large (approximately 190 species) subtribe of tribe Astereae. Recent molecular and morphological studies have prompted a new definition of the subtribe, but the lack of absolute morphological synapomorphies raises the possibility that this assemblage may not be monophyletic. Cladistic and likelihood-based analyses were conducted on a nuclear rDNA ITS sequence dataset derived from 23 of the 24 genera included in recent Solidagininae circumscriptions. Cladistic analyses identified two clades entirely composed of proposed Solidagininae genera. The data were not able to support deeper relationships, and these two clades might or might not form one monophyletic lineage. Topology testing indicated compatibility between the taxonomic definition of Solidagininae and molecular data.

Keywords: ASTERACEAE; ITS; PHYLOGENETICS; SHIMODAIRA/HASEGAWA TEST; SOLIDAGININAE

Document Type: Research article

Affiliations: 1: Department of Biology, Washington University, Campus Box 1137, St. Louis, Missouri 63130, U.S.A.; Missouri Botanical Garden, P.O. Box 299, St. Louis, Missouri 63166, U.S.A. 2: Botanical Research Institute of Texas, 509 Pecan St., Fort Worth, Texas 76102, U.S.A. 3: Department of Biological Sciences, Eastern Kentucky University, 521 Lancaster Ave., Richmond, Kentucky 40475, U.S.A. 4: Department of Biology, Brigham Young University-Idaho, 525 S. Center St., Rexburg, Idaho 83460, U.S.A. 5: Department of Botany, The University of Tennessee, Knoxville, Tennessee 37996, U.S.A.