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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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Abstract:

section is described, with a disjunct distribution in Mexico and South America. It is recovered sister to section in Bayesian, Maximum Likelihood, and Maximum Parsimony analyses of nuclear ITS and chloroplast DNA sequence data. Two new subsections, subsection and subsection , are recognized within section . These well-supported sister clades include species with bifid and multifid styles, respectively. , a new lepidote species of section endemic to Chiapas, Mexico, is described. is morphologically and phylogenetically closer to other lepidote species from Brazil than it is to the stellate , also from Mexico. This suggests two separate dispersal events from South America for the two Mexican species in the section. The replacement names and are made for the later homonyms and . Lectotypes are designated for , , , , , var. , var. , , , , , , and .

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.

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

Document Type: Research Article

DOI: http://dx.doi.org/10.1600/036364411X553162

Publication date: January 1, 2011

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