The submersion of Pedilanthus into Euphorbia (Euphorbiaceae)

Authors

  • Victor W. Steinmann Instituto de Ecología, A.C., Centro Regional del Bajío

DOI:

https://doi.org/10.21829/abm65.2003.961

Keywords:

classification, Euphorbia, Euphorbiaceae, Pedilanthus

Abstract

Pedilanthus (Euphorbiaceae) consists of about 15 species, all of which occur in Mexico. The genus belongs to the tribe Euphorbieae subtribe Euphorbiinae in the subfamily Euphorbioideae, and is one of six satellite genera of Euphorbia. As traditionally suspected, molecular studies have demonstrated that Euphorbia is paraphyletic, and the satellite genera are nested within it. In order to create a classification of Euphorbieae subtribe Euphorbiinae that reflects evolutionary relationships and employs the concept of monophyly, I argue that the genera currently segregated from Euphorbia should be included within it. Therefore, Pedilanthus is here treated as a synonym of Euphorbia. A list enumerating the valid names for species of Pedilanthus when treated within Euphorbia is provided. The following new combinations and names are proposed: Euphorbia calcarata, Euphorbia coalcomanensis, Euphorbia colligata, Euphorbia conzattii, Euphorbia cymbifera, Euphorbia cyri, Euphorbia diazlunana, Euphorbia dressleri, Euphorbia finkii, Euphorbia lomelii, Euphorbia peritropoides, Euphorbia personata, Euphorbia tehuacana, and Euphorbia tithymaloides sspp. angustifolia, bahamensis, jamaicensis, padifolia, parasitica, retusa, and smallii.

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References

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Dressler, R. L. 1957. The genus Pedilanthus (Euphorbiaceae). Contrib. Gray Herb. Harvard Univ. 182: 1-188. DOI: https://doi.org/10.5962/p.336384

Johnston, M. C. 1975. Studies of the Euphorbia species of the Chihuahuan desert region and adjacent areas. Wrightia 5: 120-143.

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Steinmann, V. W. and J. M. Porter. 2002. Phylogenetic relationships in Euphorbieae (Euphorbiaceae) based on ITS and ndhF sequence data. Ann. Missouri Bot. Gard. 89: 453-490. DOI: https://doi.org/10.2307/3298591

Webster, G. L. 1967. The genera of Euphorbiaceae in the southeastern United States. J. Arnold Arb. 48: 303-361, 363-430. DOI: https://doi.org/10.5962/p.185727

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Published

2003-10-01

How to Cite

Steinmann, V. W. (2003). The submersion of Pedilanthus into Euphorbia (Euphorbiaceae). Acta Botanica Mexicana, (65), 45–50. https://doi.org/10.21829/abm65.2003.961
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Issue

No. 65 (2003)

Section

Research article

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