Best maximum likelihood topology from analysis of the plastid dataset. Thickest lines indicate strong support (MP BS ≥ 70%, ML BS ≥ 70% and BI PP ≥ 95%), medium lines indicate moderate support (either ML BS ≥ 70% or BI PP ≥ 95%), and thin lines indicate weak support (ML BS ≤ 70% and BI PP ≤ 95%). * indicates a node along the backbone of the phylogeny that received support only from BI analysis. Support values are given as MP BS/ML BS/BI PP. The North American species are colored according to the legend given. Numbers after taxon names indicate multiple accessions of that species (see Table 2). Symbols denote ploidy: solid circles are diploids, triangles triploids, squares tetraploids, and hexagons the hexaploid D. clintoniana.
Sessa et al. BMC Evolutionary Biology 2012 12:104 doi:10.1186/1471-2148-12-104