Thymelaeaceae is evergreen or deciduous tree, shrub or herb, consisting of approximately 50 genera and 800 species worldwide, mostly in tropical and temperate regions of Africa, India, and Australia. In Korea, there are ten species of five genera (Daphne, Diarthron, Edgeworthia, Stellera, and Wikstr...
Thymelaeaceae is evergreen or deciduous tree, shrub or herb, consisting of approximately 50 genera and 800 species worldwide, mostly in tropical and temperate regions of Africa, India, and Australia. In Korea, there are ten species of five genera (Daphne, Diarthron, Edgeworthia, Stellera, and Wikstroemia), which has been recognized as the Daphne group in subfamily Thymelaeoideae. To investigate the phylogenetic relationship of the genera within the Daphne group and to understand patterns of morphological characters, the nucleotide sequences of the ITS, matK, and rbcL regions were determined from 32 species of 8 genera. Our phylogenetic analyses showed that Daphne and Wikstroemia did not form monophyletic groups. Daphne genkwa was nested within Wikstroemia, suggesting that traditional circumscription of Wikstroemia should expand to include D. genkwa. The broad sense of Wikstroemia was sister to Stellera and the core Daphne sister to Diarthron. Edgeworthia appeared as a sister group of a clade in which Daphne, Diarthron, Stellera and Wikstroemia were united. Daphnopsis and Dirca appeared as a sister group of all other genera. Reconstruction of evolutionary pattern of several characters that have been used to distinguish Daphne from Wikstroemia, such as leaf arrangement, leaves pubescence, inflorescence position, inflorescence type, flower fragrance, flower color, hypanthium pubescence, Number of sepals, number of stamens and disk shape, showed a complex pattern of homoplasy, making it difficult to delimit Daphne and Wikstroemia morphologically.
Thymelaeaceae is evergreen or deciduous tree, shrub or herb, consisting of approximately 50 genera and 800 species worldwide, mostly in tropical and temperate regions of Africa, India, and Australia. In Korea, there are ten species of five genera (Daphne, Diarthron, Edgeworthia, Stellera, and Wikstroemia), which has been recognized as the Daphne group in subfamily Thymelaeoideae. To investigate the phylogenetic relationship of the genera within the Daphne group and to understand patterns of morphological characters, the nucleotide sequences of the ITS, matK, and rbcL regions were determined from 32 species of 8 genera. Our phylogenetic analyses showed that Daphne and Wikstroemia did not form monophyletic groups. Daphne genkwa was nested within Wikstroemia, suggesting that traditional circumscription of Wikstroemia should expand to include D. genkwa. The broad sense of Wikstroemia was sister to Stellera and the core Daphne sister to Diarthron. Edgeworthia appeared as a sister group of a clade in which Daphne, Diarthron, Stellera and Wikstroemia were united. Daphnopsis and Dirca appeared as a sister group of all other genera. Reconstruction of evolutionary pattern of several characters that have been used to distinguish Daphne from Wikstroemia, such as leaf arrangement, leaves pubescence, inflorescence position, inflorescence type, flower fragrance, flower color, hypanthium pubescence, Number of sepals, number of stamens and disk shape, showed a complex pattern of homoplasy, making it difficult to delimit Daphne and Wikstroemia morphologically.
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#Thymelaeaceae Phylogenetic
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