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''Trochodendron'' is a genus of flowering plants with one living species, ''Trochodendron aralioides'', and six extinct species known from the fossil record. It was often considered the sole genus in the family Trochodendraceae, though botanists now also include the distinct genus ''Tetracentron'' in the family Trochodendraceae. ==Species== * ''Trochodendron aralioides'' *†''Trochodendron beckii'' *†''Trochodendron drachuckii'' *†''Trochodendron evenense'' *†''Trochodendron kamtschaticum'' *†''Trochodendron nastae'' *†''Trochodendron protoaralioides'' ''Trochodendron'' is native to Japan, southern Korea, Taiwan and the Ryukyu Islands, with fossils know from North America and Europe. ''Trochodendron aralioides'' is an evergreen tree or large shrub growing to 20 m tall. ''Trochodendron'' and ''Tetracentron'' lack vessel elements in their wood, a quite unusual feature in angiosperms. This has long been considered a very primitive character, resulting in the classification of these two genera in a basal position in the angiosperms; however, genetic research by the Angiosperm Phylogeny Group has shown it to be in a less basal position (early in the eudicots), suggesting the absence of vessel elements in these two genera is a secondarily evolved character, not a primitive one. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Trochodendron」の詳細全文を読む スポンサード リンク
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