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Phylogenetic analyses of Andromedeae (Ericaceae subfam. Vaccinioideae)¹

³Department of Biology, Wake Forest University, Winston-Salem, North Carolina 27109-7325; ⁴Department of Botany, University of Florida, Gainesville, Florida 32611-8526; and ⁵School of Biological Science, University of New South Wales, Sydney 2052, Australia

Phylogenetic relationships within the Andromedeae and closely related taxa were investigated by means of cladistic analyses based on phenotypic (morphology, anatomy, chromosome number, and secondary chemistry) and molecular (rbcL and matK nucleotide sequences) characters. An analysis based on combined molecular and phenotypic characters indicates that the tribe is composed of two major clades—the Gaultheria group (incl. Andromeda, Chamaedaphne, Diplycosia, Gaultheria, Leucothoë, Pernettya, Tepuia, and Zenobia) and the Lyonia group (incl. Agarista, Craibiodendron, Lyonia, and Pieris). Andromedeae are shown to be paraphyletic in all analyses because the Vaccinieae link with some or all of the genera of the Gaultheria group. Oxydendrum is sister to the clade containing the Vaccinieae, Gaultheria group, and Lyonia group. The monophyly of Agarista, Lyonia, Pieris, and Gaultheria (incl. Pernettya) is supported, while that of Leucothoë is problematic. The close relationship of Andromeda and Zenobia is novel and was strongly supported in the molecular (but not morphological) analyses. Diplycosia, Tepuia, Gaultheria, and Pernettya form a well-supported clade, which can be diagnosed by the presence of fleshy calyx lobes and methyl salicylate. Recognition of Andromedeae is not reflective of our understanding of geneological relationships and should be abandoned; the Lyonia group is formally recognized at the tribal level.

Key Words: Andromedeae • Ericaceae • Lyonieae • matK • molecular systematics • rbcL.

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