Phylogenetic relationships and biogeography of <i>Stewartia</i> (Camellioideae, Theaceae) inferred from nuclear ribosomal DNA ITS sequences

TitlePhylogenetic relationships and biogeography of Stewartia (Camellioideae, Theaceae) inferred from nuclear ribosomal DNA ITS sequences
Publication TypeJournal Article
Year of Publication2002
AuthorsLi J, Del Tredici P, Yang SX, Donoghue MJ
Pagination117 - 133
Keywordsbiogeography, Hartia, nrDNA ITS, phylogeny, PLANT SCIENCES, Stewartia, Theaceae

Sequences of the internal transcribed spacers of nuclear ribosomal DNA were used to estimate phylogenetic relationships within Stewartia. Eighteen samples were included representing two species of Hartia, seven species of Stewartia, and Franklinia alatamaha. Hartia sinensis and H. villosa form a clade that is the sister group of Stewartia. Within Stewartia the New World and the Old World species form well-supported clades. The sub-genera and sections of Stewartia proposed by previous authors are not supported by our ITS data. Two clades are recognized within the Old World lineage: S. serrata + S. rostrata and S. pseudocamellia + S. monadelpha + S. sinensis. Southeastern Asia and China may be a recent center of diversification of Stewartia based on the ITS phylogeny and fossil record.

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