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Comparative morphoanatomic study of Eccremis coarctata (Ruz & Pav.) Baker occurring at different elevations of the Cordillera de Mérida

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Author(s): Eli Bali, Francisca | Luque Arias, Rebeca

Journal: Plantula
ISSN 1316-1547

Volume: 4;
Issue: 1;
Start page: 23;
Date: 2006;
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Keywords: Eccremis coarctata | Phormiaceae | plant anatomy | Andes | xeromorphy | monocotiledons

ABSTRACT
The vegetative morpho-anatomical structure of Eccremis coarctata (Phormiaceae) in specimens derived from different populations of the Cordillera de Mérida (Venezuela), exhibits marked xeromorphic characters in all of its vegetative organs. The roots are fibrous, with thickened epidermis and exodermis, the cortex is parenchymatic, separated by the pericycle by a double layer of sclereids, and the stele is polyarch. Stem with thickened epidermis and endodermis, cortex parenchymatic, followed by a meristematic region which generates numerous amphivasal bundles. Inflorescence stem with parenchymatic cortex, separated from the atactostele by a multi-stratified fibre sheath of. Leaves always hypostomatic, equitant, adaxial cuticle and epidermic cells of both layers with thickened walls, abaxial epidermic cells with prominent pits, whilst the abaxial cells form papillae. Stomata anomocytic. Hypodermis single layered. Mesophyll compact and homogeneous, differentiated in a peripheral photosynthetic region, and a central colorless region, where the lisigenous activity of the cells originate intercellular spaces and air cavities in the sheath. The collateral vascular bundles form schlerenchymatic girders that extend to the epidermis on both surfaces. The only morpho-anatomical differences observed among the individuals of different populations where differences in the thickness and tannin contents of the leaf lamina, such differences were not related to the altitude, instead, with variations of the texture of the soils.
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