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| Format: | Artículo científico |
| Language: | en |
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Universidad Central de Venezuela
2005
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| Online Access: | https://www.redalyc.org/articulo.oa?id=86228213 |
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Table of Contents:
- Vegetative anatomy of aratitiyopea lopezii (xyridaceae) Lisa M. Campbell Dennis W. Stevenson Biología Guayana Mesophyte Xerophyte Xyridaceae Aratitiyopea The center of generic diversity of the monocot family Xyridaceae is northernSouth America, where four of the five genera are endemic. Many species of these foursmall genera have restricted distributions and have not been critically studied, includingthe monospecific genus Aratitiyopea. Populations of this unusual Xyridaceae occur inmid-elevation, forested montane sites. Most Xyridaceae occur in exposed habitats, andalthough they are at least seasonally wet, many species exhibit xeromorphic adaptations.In contrast, Aratitiyopea presents a morphology and internal anatomy of a mesophyte(trailing stems, leaves with a relatively broad lamina, little mechanical tissue, and lackinga hypodermis, the latter two features present in other Xyridaceae with bifacial leaves)as well as effects of seasonal drying (cell death in the root and thickened endodermal cellwalls). Structural details of the vegetative body of Aratitiyopea are presented here, andcompared to that known for other Xyridaceae. Although the gestalt of Aratitiyopea isaberrant in Xyridaceae, it is structurally consistent with the family, and unusual featuresare interpreted as adaptations to its habitat, which few other Xyridaceae occupy. 2005 artículo científico 0084-5906 https://www.redalyc.org/articulo.oa?id=86228213 en http://www.redalyc.org/revista.oa?id=862 Acta Botanica Venezuelica application/pdf Universidad Central de Venezuela Acta Botanica Venezuelica (República Bolivariana de Venezuela) Num.2 Vol.28