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Tribe Theeae, which includes some economically important and widely grown plants, such as beverage tea and a number of woody ornamentals, is the largest member of the Theaceae family. Using five genomic regions (chloroplast:  atpI-H ,  matK ,  psbA5'R-ALS-11F ,  rbcL ; nuclear:  LEAFY ) and 30 species representing four of the five genera in this tribe ( Apterosperma ,  Camellia ,  Polyspora , and  Pyrenaria  s.l.), we investigated the phylogeny of Theeae and assessed the delimitation of genera in the tribe. Our results showed that  Polyspora  was monophyletic and the sister of the three other genera of Theeae investigated,  Camellia  was paraphyletic and  Pyrenaria  was polyphyletic. The inconsistent phylogenetic placement of some species of Theeae between the nuclear and chloroplast trees suggested widespread hybridization between  Camellia  and  Pyrenaria ,  Polyspora  and  Parapyrenaria . These results indicate that hybridization, rather than morphological homoplasy, has confused the current classification of Theeae. In addition, the phylogenetic placement and possible allies of  Laplacea  are also discussed.

Molecular Phylogeny of Tribe Theeae (Theaceae s.s.) and Its Implications for Generic Delimitation