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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Keating, R.C. Leaf anatomical characters and their value in understanding morphoclines in the Araceae. Bot. Rev 68, 510–523 (2002). https://doi.org/10.1663/0006-8101(2002)068[0510:LACATV]2.0.CO;2
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DOI: https://doi.org/10.1663/0006-8101(2002)068[0510:LACATV]2.0.CO;2