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Anatomía foliar de las especies de Paragynoxys Cuatrec. (Asteraceae) del Estado Mérida, Venezuela

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Author(s): Torres, Fresia | Robles, Lirsy

Journal: Plantula
ISSN 1316-1547

Volume: 1;
Issue: 2;
Start page: 151;
Date: 1996;
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Keywords: Leaf anatomy | Asteraceae | Paragynoxys | Paramo

ABSTRACT
The foliar anatomy of three species of the genera Paragynoxys that grow in the Andean Paramos of the State of Mérida (Venezuela) was studied. The study revealed that, in spite of the differences in shape and size of the leaf blades, and the length and thickness of the petioles, the three species present a common structural pattern in the anatomy in each part of the leaf. The variations found are concordant with the leaf size and the characteristics of the habitat. A special support mechanism with scarce differentiation of sclerenchyma with small epidermic cells, a double layered hipodermis, a mesophyll with large intracellular spaces, etc. proportion the leaf the properties of lightness, flexibility and plasticity. Comparisons were made with similar structures that occur in the arboreal species of the tribe Espeletiinae.

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