One of the 8100 most parsimonious trees (L = 476, CI = 0.7542, RI = 0.9722) obtained by cladistic genotypic clustering of combined ETS and ITS sequences from 158 Asimitellaria plants and nine outgroups. Branches that collapse in the strict consensus tree are shown by dashed lines. Nodal support values by bootstrapping or posterior probability are indicated near branches (MP/NJ/BI) where needed. Vertical bars on the right, with the exception of the M. pauciflora complex, represent distinct biological species proposed in the present study, which have substantial reproductive barriers to each other (> 39% of fertility reduction if crossed). For the M. pauciflora species complex, the labels in blue, red, and green each represent the taxonomic species M. pauciflora, M. furusei var. furusei, and M. furusei var. subramosa, respectively, at least among those that have a substantial level of reproductive isolation (> 57% of fertility reduction if crossed). Pictures on the right indicate some diagnostic characters (i.e., flower or abaxial side of the leaf) for (cryptic) biological species in several species complexes. The population ID nos. (see Additional file 1: Table S1 for details) from which the individual accessions were collected are indicated in parentheses.