As seen in the section above, trees are found among many plant families that also include shrubs and herbs, so that the concept of tree is not a phylogenetic one. Further, there is no clear consensus as to whether the tree form is the advanced or primitive condition. Some paleobotanists suggest that trees are the most primitive members within these plant families. However, tree forms are found in all the vascular plants, from the club mosses and ferns to the gymnosperms and angiosperms. It is furthermore true that, among the flowering plants, trees are found not only among the most primitive members (order Magnoliales) but also among the more specialized, or advanced, members, such as the roses (order Rosales).
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