A Preliminary Survey of Petiolar Collenchyma in the Araceae

This article presents a preliminary systematic survey of 115 species from 56 genera (approximately 51% of the genera) of Araceae in which the pattern of petiolar collenchyma (or its absence) is described and classified. This feature appears very conservative within the genera, apparently not changin...

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Bibliographic Details
Published in:Annals of the Missouri Botanical Garden 2004-01, Vol.91 (3), p.473-484
Main Authors: Gonçalves, Eduardo G., Élder A. S. Paiva, Marcus A. Nadruz Coelho
Format: Article
Language:English
Subjects:
Bisexuality
Botanical gardens
Collenchyma
Genera
Petioles
Plants
Pulvini
Sclerenchyma
Taxa
Vascular bundles
VIII International Aroid Conference, Missouri Botanical Garden, St. Louis, 9-11 August 1999
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Summary:This article presents a preliminary systematic survey of 115 species from 56 genera (approximately 51% of the genera) of Araceae in which the pattern of petiolar collenchyma (or its absence) is described and classified. This feature appears very conservative within the genera, apparently not changing qualitatively with developmental or environmental conditions. Cross sections at the midpoint between petiole base and apex were mainly studied, but apical and basal sections were also observed in those genera where the collenchyma is absent at petiole midpoint. Three patterns are defined: (1) collenchyma absent at the midpoint between petiole base and apex; (2) a peripheral continuous or interrupted ring of collenchyma (philodendroid pattern); (3) rounded strands of collenchyma concentrically disposed and associated with peripheral vascular bundles (colocasioid pattern). No genera with bisexual flowers so far analyzed have collenchyma at petiole midpoints, although this usually occurs at apex and base. Monoecious genera can display all three patterns, but pattern 1 appears restricted to tribe Zamioculcadeae and the genus Anubias. The presence of a fully collenchymatous petiole seems to appear only in more derived genera in the Araceae: it may be an apomorphic feature within the family.
ISSN:0026-6493