The Origin of a Land Flora

work by Bower

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July 1, 2026

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Frederick Orpen Bower's The Origin of a Land Flora (1908) is a seminal work in botany that explores the evolutionary development of primitive land plants, particularly ferns. Bower's key contribution was his interpolation theory, which explained the alternation of generations in plant life cycles. This theory posits that the sporophyte generation (asexual) and the gametophyte generation (sexual) evolved independently in early land plants.1

Bower suggested that land plants evolved as the sporophyte progressively specialized, with only a few spores developing into vegetative cells of an independent plant. While the exact algal origins of land plants are still debated, Bower's work synthesized paleobotany and plant morphology, significantly advancing the study of plant evolution and the transition of flora from water to land.12

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Frederick Orpen Bower
…work, summarized in his classic The Origin of a Land Flora (1908), have done much to coordinate paleobotany and plant morphology in a widespread study of plant evolution. Bower also wrote The Ferns, 3 vol. (1923–28), Size and Form in Plants (1930), and Primitive Land Plants (1935).
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…work, summarized in his classic The Origin of a Land Flora (1908), have done much to coordinate paleobotany and plant morphology in a widespread study of plant evolution. Bower also wrote The Ferns, 3 vol. (1923–28), Size and Form in Plants (1930), and Primitive Land Plants (1935).
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