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Mem 57 c02-morphology and systematics of the cycadales. sold by nybgshop.org for $4.99

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AbstractSTEVENSON, D. W. (New York Botanical Garden, Bronx, New York 10458, USA). Morphology¬†and systematics of the Cycadales. Memoirs of The New York Botanical Garden 57:¬†8√Ę‚ā¨‚Äú55. 1990. The morphology, anatomy, and systematics of the Cycadales are reviewed¬†and discussed with emphasis upon new information published since the last comprehensive¬†work on Gymnosperms by Chamberlain, fifty-five years ago. The morphology and anatomy¬†of vegetative and reproductive structures are discussed in terms of the systematic distribution¬†of the character state at the generic level and gaps in our information concerning these¬†features are pointed out. Vegetative topics include growth habit, secondary growth with¬†emphasis on polyxyly and extrafascicular vasculature, leaf morphology and petiole vasculature,¬†and root morphology. Reproductive topics include ovule morphology and vasculature,¬†mega- and microsporophyll morphology and vasculature, and reproductive branching.¬†The historical aspects of classification, at the generic level and above, are briefly reviewed.¬†Cladistic analyses are provided with discussions on character distributions and the interpretations¬†of the cladograms. A provisional classification is presented based on the cladistic¬†analyses.

Keywords: cladistics, leaves, megasorophylls, microsporophylls, ovules, roots, stems




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