The status of the three taxa belonging to Timmia section Norvegica has not yet been satisfyingly resolved, despite several studies during the last ca. 30 years. In this study, relationships among specimens matching T. norvegica, T. comata and T. sibirica morphologies were inferred from a portion of the nuclear 26S and the chloroplast loci trnL-trnF and atpB-rbcL. Maximum parsimony analysis provided high support for the monophyly of Timmia section Norvegica, T. comata, and a clade comprising T. sibirica and T. norvegica, whereas the relationships among specimens with morphologies of the latter two taxa could be resolved only by means of haplotype networks. The haplotype network based on 26S separates T. sibirica from T. norvegica, whereas the two chloroplast markers do not. Based on the 26S differences and morphological evidence, T. sibirica and T. norvegica are considered different at the species level. Timmia comata is resolved in a haplotype network separate from that of T. norvegica plus T. sibirica. The combination with the high bootstrap support of the clade with T. comata specimens and their morphological distinctness from T. norvegica strongly supports their recognition as a distinct species.
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Vol. 114 • No. 4