Petiole and leaf anatomy of species of the genus Rhus s. str. (Anacardiaceae)

  • Agustina Rosa Andrés-Hernández Programa de Botánica, Colegio de Postgraduados, Montecillo
  • Teresa Terrazas Departamento de Botánica, Instituto de Biología, Universidad Nacional Autónoma de México
Keywords: Lobadium, Rhus, sclerenchyma, Styphonia, Terebinthifolia

Abstract

Foliar and petiole anatomy of 33 species of Rhus s. str. is described with the main objective of evaluating anatomical traits to support its infrageneric classification. The results support the existing Rhus s. str. infrageneric classification. The subgenus Rhus, with a vascular system type I and more than ten layers of collenchyma and wide pith in the petiole may be readily separated from subgenus Lobadium. In turn, section Terebinthifolia shows two to four vessel elements, collenchymatic sheath surrounding the vascular bundles and gelatinous fibers, while section Styphonia presents a thick cuticle (6 µm), papillose epidermal cells, two layers of palisade parenchyma and sclerenchyma in xylem and phloem. The occurrence of sclerenchyma in section Styphonia is correlated with the persistent character of its leaves. Some of the foliar traits mentioned are undoubtedly related with the radiation events of Rhus s. str. that took place in Mexico.

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Petiole and leaf anatomy of species of the genus Rhus s. str. (Anacardiaceae)
Published
2006-06-15
How to Cite
Andrés-Hernández, A. R., & Terrazas, T. (2006). Petiole and leaf anatomy of species of the genus Rhus s. str. (Anacardiaceae). Botanical Sciences, (78), 95 - 106. https://doi.org/10.17129/botsci.1723
Section
STRUCTURAL BOTANY / BOTÁNICA ESTRUCTURAL