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Open Access Croton Section Pedicellati (Euphorbiaceae), a Novel New World Group, and a New Subsectional Classification of Croton Section Lamprocroton

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Croton section Pedicellati is described, with a disjunct distribution in Mexico and South America. It is recovered sister to Croton section Lamprocroton in Bayesian, Maximum Likelihood, and Maximum Parsimony analyses of nuclear ITS and chloroplast trnL-F DNA sequence data. Two new subsections, Croton subsection Lamprocroton and Croton subsection Argentini , are recognized within Croton section Lamprocroton. These well-supported sister clades include species with bifid and multifid styles, respectively. Croton breedlovei , a new lepidote species of section Pedicellati, endemic to Chiapas, Mexico, is described. Croton breedlovei is morphologically and phylogenetically closer to other lepidote species from Brazil than it is to the stellate C. tenuilobus, also from Mexico. This suggests two separate dispersal events from South America for the two Mexican species in the section. The replacement names C. longicolumellus and C. tenuicaulis are made for the later homonyms C. microcarpus and C. microstachys. Lectotypes are designated for C. andinus, C. angustifrons, C. burchellii, C. catinganus, C. cerino-dentatus, C. cerino-dentatus var. martii, C. cerino-dentatus var. warmingii, C. cuyabensis, C. eriocladoides, C. linearifolius, C. microcarpus, C. microstachys, and C. saxosus.

Spanish
Se describe a Croton sección Pedicellati , que tiene una distribución disjunta entre México y Suramérica. En los análisis Bayesianos, de Máxima Verisimilitud, y de Máxima Parsimonia de secuencias de ADN de ITS del núcleo y de trnL-F del cloroplasto se recupera hermana a Croton sección Lamprocroton. Dos nuevas subsecciones, Croton subsección Lamprocroton y Croton subsección Argentini , son reconocidos dentro de Croton sección Lamprocroton. Estos clados hermanos con buen soporte incluyen especies con estilos bífidos y multífidos respectivamente. Se describe a Croton breedlovei , una nueva especie con indumento lepidoto en la sección Pedicellati, endémica de Chiapas, México. Croton breedlovei es mas cercana morfológicamente y filogenéticamente a otras especies lepidotas de Brasil que a C. tenuilobus, la cual tiene el indumento estrellado, y también es endémica de México. Esto sugiere dos eventos distintos de dispersión desde Suramérica para las especies mexicanas de la sección. Se crean los nombres C. longicolumellus y C. tenuicaulis para remplazar a los homónimos C. microcarpus y C. microstachys. Se designan lectotipos para C. andinus, C. angustifrons, C. burchellii, C. catinganus, C. cerino-dentatus, C. cerino-dentatus var. martii, C. cerino-dentatus var. warmingii, C. cuyabensis, C. eriocladoides, C. linearifolius, C. microcarpus, C. microstachys, y C. saxosus.

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Keywords: CROTON BREEDLOVEI; DISJUNCTION; EUPHORBIACEAE; MOLECULAR PHYLOGENY; SECTIONAL CLASSIFICATION

Document Type: Research Article

Publication date: January 1, 2011

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