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Morphological variation in leaf shape in Ainsliaea apiculata with special reference to the endemic characters of populations on Yakushima Island, Japan



Morphological variation in leaf shape in Ainsliaea apiculata with special reference to the endemic characters of populations on Yakushima Island, Japan



Journal of Plant Research 120(3): 351-358



We analyzed leaf shape variations in Ainsliaea apiculata Sch. Bip. to evaluate the uniqueness of morphological characters in populations on Yakushima Island, Kagoshima Prefecture, Japan. Leaf size and shape from populations on Yakushima Island (n = 300) were compared with those from populations in other areas of Japan (n = 300). A considerable amount of variation occurred in leaf size in A. apiculata populations both on Yakushima Island and elsewhere, but clear discontinuities in leaf size were not detected. Some variants previously thought to be endemic to Yakushima Island, i.e., A. apiculata var. acerifolia and A. apiculata var. rotundifolia, were also found in other locations in Japan. Moreover, these leaf types were found to be continuous with the typical leaf shape of A. apiculata var. apiculata via various intermediate types, suggesting the need for future revision of these taxa. Based on these results, we reevaluated the uniqueness of the Yakushima populations of A. apiculata in terms of leaf variation. The uniqueness of the Yakushima populations was defined by a more diverse leaf shape than found in populations from other areas.

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Accession: 013763970

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PMID: 17404687

DOI: 10.1007/s10265-007-0079-y



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