Abstract

Abstract Several representatives of Hydrangeaceae tribe Hydrangeeae are popular in the horticultural trade for their inflorescences with attractive marginal flowers, resulting in many hybrids and cultivars. However, despite previous morphological and molecular studies, the phylogenetic relationships between the nine currently recognized genera in this clade are still largely unclear, and the widely used infrageneric classification of the genus Hydrangea by McClintock (which was mainly based on the study of herbarium specimens) requires critical reevaluation. We present a partially well resolved and well supported phylogeny of the tribe Hydrangeeae based on maximum parsimony and Bayesian analyses of multiple coding and noncoding chloroplast regions (rps 16-trnK spacer, trnK intron, trnK exon, matK gene and trnK-psbA spacer). All genera, sections and subsections were included making it a representative sampling for the tribe Hydrangeeae. Hydrangea is paraphyletic with respect to the eight other genera of Hy...

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