Diversity and Evolution in the shoot organization of Thymelaeaceae

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Morphological and molecular phylogenetic examinations were made to elucidate diversity and evolution of the shoot organization of the family Thymelaeaceae. 20 species of the family, including of the five Japanese indigenous genera and of the genera Dais, Gnidia, Daphnopsis, Aquilaria, were examined. The nucreotide sequences of the matK gene on the chloroplast DNA were analyzed with an autosequencer afrter amplified with PCR. A phylogenetic tree was constracted on the bases of the sequence data of the matK gene. The configulation of the tree was not in accordance with current system of Thymelaeaceae and suggests that the system should be revised. As the results of the examination on the shoot organization, the trichotomous branches of Edgeworthia were revealed to be a terminal shoot and its rateral branches. It was also found that there are different two phylotaxy in Daphne genkwa, i.e. alternate in the short flowering branches and opposite in the long vegetative branches. In the tribe Daphneae, the head like infloerescence with an distinct axillary bud at the ultimate leaf is considered to be plesiomorphic and the loose inflorescence of Diplomorpha may be apomorphic.