Elementary biology; an introduction to Elementary biology; an introduction to the science of life elementarybiolog00grue Year: 1924 Fig. 251. Genealogical tree of plant life This diagram is intended to suggest the common origin of all plant forms, with the constant progressive departure from ancestral types, now in one direction and now in another, like the branching of a tree. Lowei- and higher mean nearer to or farther from the original types. The closer together two forms are on a given branch, the more closely related they are considered (cf. Fig. 252)

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