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The Anatomy of PalmsArecaceae - Palmae$
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P. Barry Tomlinson, James W. Horn, and Jack B. Fisher

Print publication date: 2011

Print ISBN-13: 9780199558926

Published to Oxford Scholarship Online: May 2015

DOI: 10.1093/acprof:osobl/9780199558926.001.0001

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Leaf Axis

Leaf Axis

(p.32) Chapter 4 Leaf Axis
The Anatomy of Palms

P. Barry Tomlinson

James W. Horn

Jack B. Fisher

Oxford University Press

The palm leaf axis is a complex organ divided into three discrete and disparate regions: leaf sheath, petiole, and rachis, each with a different function — basal support, blade extension, and blade support, respectively. Although this leads to different anatomical features there is a structural continuity from one to the other because they are developmentally continuous as a unit and vascular bundles extend from one region to another. This chapter first discusses the palm petiole, covering surface layers, peripheral sclerenchyma, V-arrangement, vascular bundles, ground tissue, and transverse veins. It then examines the unique attributes of leaf morphology in palms as a consequence of their frequently massive construction and great diversity. It covers monocotyledons, open and closed leaf sheaths, and the palm leaf sheath.

Keywords:   palms, palm leaf, leaf axis, vegetative anatomy, leaf morphology, leaf sheaths

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