Leaf anatomical characters and their value in understanding morphoclines in the Araceae |
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Authors: | Richard C Keating |
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Institution: | (1) Missouri Botanical Garden, 63166-0299 Saint Louis, MO, USA |
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Abstract: | Leaf anatomy and petiole anatomy of the Araceae are discussed in terms of their potential use as character states in a phylogenetic
analysis. The characters include leaf venation and structure, leaf epidermis, mesophyll ground tissue, vascular bundles, sclerenchyma,
collenchyma, laticifers, secretory ducts, and raphide crystals. Characters that seem to have the greatest potential for use
in phylogenetic analysis include those of ground tissue, vascular bundles, fibers, trichosclereids, collenchyma, and laticifers.
Other, equally distinguishable, characters have states that are apparently autapomorphies, providing little phylogenetic signal.
Therefore, although most leaf and petiole structural variation is useful diagnostically, some characters will probably be
less valuable in phylogenetic analysis than originally hoped. |
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Keywords: | |
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