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1 June 2018 Notes sur Euphorbia sect. Denisophorbia (Euphorbiaceae) à Madagascar: description d'une nouvelle espèce et une nouvelle synonymie
Jean-Philippe Castillon, Jean-Bernard Castillon
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Abstract

Castillon, J.-P. & J.-B. Castillon (2018). Notes on Euphorbia sect. Denisophorbia (Euphorbiaceae) in Madagascar: description of a new species and a new synonymy. Candollea 73: 19–25. In French, English and French abstracts. DOI:  http://dx.doi.org/10.15553/c2018v731a3

The identity of the poorly known species Euphorbia commersonii Baill. (Euphorbiaceae) is clarified. This species occurring in the Fort-Dauphin region (in the Southeast of Madagascar) is assigned to Euphorbia sect. Denisophorbia (Leandri) Croizat. Formerly considered as a later synonym of Euphorbia thuarsiana Baill., Euphorbia commersonii is reinstated and Euphorbia elliotii Leandri is considered as a later synonym. A lectotype is designated for the latter species. Euphorbia neoelliotii J.-P. Castillon & J.-B. Castillon, belonging to the same section, is described and illustrated. This new species is distinguished from Euphorbia commersonii by its more elongated and much less coriaceous leaves and its incyathescences with short green peduncles bearing a single green cyathium with tiny cyathophylls appressed to the involucre.

© CONSERVATOIRE ET JARDIN BOTANIQUES DE GENÈVE 2018
Jean-Philippe Castillon and Jean-Bernard Castillon "Notes sur Euphorbia sect. Denisophorbia (Euphorbiaceae) à Madagascar: description d'une nouvelle espèce et une nouvelle synonymie," Candollea 73(1), 19-25, (1 June 2018). https://doi.org/10.15553/c2018v731a3
Published: 1 June 2018
JOURNAL ARTICLE
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KEYWORDS
Euphorbia
Euphorbia sect. Denisophorbia
Euphorbiaceae
Madagascar
new species
nomenclature
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