Características Anatómicas de Hoja y Flor Con Importancia Taxonómica Para La Delimitación de Cuatro Especies En El Género Moussonia (Gesneriaceae)1

Publication Type:Journal Article
Year of Publication:2011
Authors:Ramírez-Roa, A, Hernández, GVarela
Journal:Annals of the Missouri Botanical Garden
Volume:98
Issue:3
Date Published:2011
ISBN Number:0026-6493
Keywords:Angelica, Gesneriaceae
Abstract:

Abstract The lack of a taxonomic treatment and keys for the genus Moussonia Regel (Gesneriaceae) has led some species to be confused with each other or to be considered as varieties or synonyms. Additionally, several morphological and anatomical characters have not been evaluated for their usefulness in discriminating Moussonia species. In this work we focus principally on the study of several morphological and general anatomical features of the abaxial surface of the leaf and of the mesophyll as well as the adaxial surface of the corolla tube. We found that these features have taxonomical value to delimit four species included in Moussonia: M. ampla L. E. Skog, M. deppeana (Schltdl. & Cham.) Hanst., M. elegans Decne., and the new combination M. jaliscana (S. Watson) D. L. Denham ex Ramírez-Roa, as transferred from Isoloma jaliscanum S. Watson. Anatomical features of the leaf such as stomatal domes generally with one or two stomata on the top, relative stomata size, epidermal cells surrounding trichome bases, trichome types, apparent density of stomata and trichomes on the leaf lower surface, blade mesophyll, and variation of epidermal cells on the adaxial surface of the corolla were observed. We briefly discuss some possible interpretations of this anatomy with respect to the environment. A brief taxonomic treatment of the species considered in this work is included for a better understanding of the underlying problem. Considering these anatomical and morphological features, we propose a new definition of M. elegans, together with the corresponding nomenclatural changes. We propose M. jaliscana as a new combination and include an identification key using anatomical and morphological features.Abstract The lack of a taxonomic treatment and keys for the genus Moussonia Regel (Gesneriaceae) has led some species to be confused with each other or to be considered as varieties or synonyms. Additionally, several morphological and anatomical characters have not been evaluated for their usefulness in discriminating Moussonia species. In this work we focus principally on the study of several morphological and general anatomical features of the abaxial surface of the leaf and of the mesophyll as well as the adaxial surface of the corolla tube. We found that these features have taxonomical value to delimit four species included in Moussonia: M. ampla L. E. Skog, M. deppeana (Schltdl. & Cham.) Hanst., M. elegans Decne., and the new combination M. jaliscana (S. Watson) D. L. Denham ex Ramírez-Roa, as transferred from Isoloma jaliscanum S. Watson. Anatomical features of the leaf such as stomatal domes generally with one or two stomata on the top, relative stomata size, epidermal cells surrounding trichome bases, trichome types, apparent density of stomata and trichomes on the leaf lower surface, blade mesophyll, and variation of epidermal cells on the adaxial surface of the corolla were observed. We briefly discuss some possible interpretations of this anatomy with respect to the environment. A brief taxonomic treatment of the species considered in this work is included for a better understanding of the underlying problem. Considering these anatomical and morphological features, we propose a new definition of M. elegans, together with the corresponding nomenclatural changes. We propose M. jaliscana as a new combination and include an identification key using anatomical and morphological features.

URL:http://dx.doi.org/10.3417/2005150
Short Title:Annals of the Missouri Botanical Garden
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