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Systematics Section / ASPT

Leon, Bernardino [1], Vester, Hans [1], Berry, Paul E. [2], Van Ee, Benjamin [2], Garcia, Armando [3], Contreras, Ricardo [3], Villanueva, Rogel [1], Gernandt, David S. [4].

Caracterizacion arquitectonica, molecular, y cromosomica de Croton seccion Eluteria (Euphorbiaceae). Architectural, molecular, and chromosomal characterization of Croton section Eluteria (Euphorbiaceae).

Con los resultados obtenidos hasta el momento de caracteres morfologicos, moleculares, y geograficos podemos afirmar que Croton seccion Eluteria Griseb. es un grupo monofiletico. El grupo hermano de la seccion consiste de C. brittonianus, C. myricifolius, y C. bispinosus, tres especies endemicas de Cuba. Secc. Eluteria manifiesta floracion terminal pseudoaxiliar, que la distingue de la majoria de especies de Croton cuyo habito principal es de tener floracion terminal. El numero cromosomico de secc. Eluteria,2n = 20,coincide con la mayoria de especies del genero. Algunas de las sinonimias previamente reportadas fueron confirmadas. Sin embargo, aun queda pendiente aclarar si C. guatemalensis Lotsy es sinonimo de C. reflexifolius Kunth.y si C. schiedeanus Schtdl. es sinonimo de C. nitens (L.)Sw. With the results obtained to date from morphological, molecular, and geographical characters we can confirm that Croton section Eluteria Griseb. is a monophyletic group. The sister group of the section consists of C. brittonianus, C. myricifolius, and C. bispinosus, three species endemic to Cuba. Sect. Eluteria has pseudoaxillary terminal inflorescences, distinguishing it from most species of Croton which primarily have terminal inflorescences. The chromosome number of sect. Eluteria, 2n = 20, coincides with a majority of Croton species. Some of the previously reported synonymies were confirmed. However, it is still necessary to determine if C. guatemalensis Lotsy is a synonym of C. reflexifolius Kunth and if C. schiedeanus Schtdl. is a synonym of C. nitens (L.) Sw.


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1 - El Colegio de la Frontera Sur, Unidad Chetumal, Ecologia y sistematica terrestre, Av. Centenario Km. 5.5, Chetumal, Quintana Roo, C.P. 77900, Mexico
2 - University of Wisconsin Madison, Department of Botany, Birge Hall, 430 Lincoln Drive, Madison, Wisconsin, 53706-1381, USA
3 - , Mexico
4 - Universidad Autonoma del Estado de Hidalgo, Centro de Investigaciones Biologicas, AP 1-69, Plaza Juarez, Pachuca, Hidalgo, 42001, Mexico

Keywords:
Euphorbiaceae
Croton
Arboreal arquitecture
Cytology
molecular phylogenetics
ITS.

Presentation Type: Poster
Session: 33-88
Location: Salon C, D & E - Gov Ballroom/Hilton
Date: Tuesday, August 16th, 2005
Time: 12:30 PM
Abstract ID:193


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