Taxonomy and Phylogeny of Croton Section Heptallon (Euphorbiaceae)

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Abstract:

A taxonomic key, synonymy, and a molecular phylogeny of the nine species and three varieties of section (Euphorbiaceae) are presented. Section is synonymized with section , and the species from outside of North America that had been placed into these two sections are shown to belong in other clades within the genus. As circumscribed here, section is a well-supported clade of annual herbs and subshrubs that ranges from central Mexico to the eastern United States. A new combination, , is made. Lectotypes are designated for var. var. , and .

Spanish
Una clave taxonómica, sinonimia, y una filogenia molecular son presentados para las nueve especies y tres variedades de Croton sección Heptallon (Euphorbiaceae). Sección Angelandra se sinonimiza con sección Heptallon, y se demuestra que las especies de fuera de Norte América que habían sido incluidas en estas dos secciones pertenecen a otros clados dentro del género. Como está circunscrita aquí, sección Heptallon es un clado con buen apoyo de hierbas anuales y subarbustos que se distribuye desde el centro de México hasta el oriente de los Estados Unidos. Se hace una nueva combinación, Croton heptalon . Se designan lectotipos para C. corymbulosus, C. elliottii, C. ellipticus, C. engelmannii var. albinoides, C. eutrigynus, C. heptalon, C. leucophyllus var. trisepalis, y Heptallon graveolens.

Keywords: CROTON; EUPHORBIACEAE; MOLECULAR PHYLOGENY; NORTH AMERICA; SECTION ANGELANDRA; SECTION HEPTALLON

Document Type: Regular Paper

DOI: http://dx.doi.org/10.1600/036364410790862461

Publication date: January 1, 2010

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