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Euphorbia adenoplicata, a New Species of Euphorbia sect. Crossadenia from Brazil

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A new species, Euphorbia adenoplicata , is here described and illustrated. The species was found in the vicinity of Serra Geral do Tocantins, close to the border of the states of Tocantins and Bahia, within the Cerrado biome, where it grows in cerrado rupestre (rocky savannah vegetation). Euphorbia adenoplicata is placed in Euphorbia sect. Crossadenia based on morphological characters. The species is unique within the section due to its cyathial glands with the margins folded in the middle portion, splitting each gland into two cavities. We compare the morphology and ecology of E. adenoplicata with E. sarcodes and other species of E. sect. Crossadenia subsect. Ephedropeplus. Finally, we recommend that E. adenoplicata be considered critically endangered due to its extreme rarity.

Keywords: Cerrado; Euphorbia subgenus Chamaesyce; Tocantins; cerrado rupestre; subsection Ephedropeplus; taxonomy

Document Type: Research Article

Affiliations: 1: 1Núcleo de Pesquisa Curadoria do Herbário SP, Instituto de Botânica. Avenida Miguel Stéfano 3687, São Paulo, CEP 04301-902, SP, Brazil 2: 2Departamento de Botânica, Instituto de Biociências, Universidade de São Paulo, Rua do Matão 277, 05508-090, São Paulo, SP, Brazil 3: 3Real Jardín Botánico, RJB-CSIC, Plaza de Murillo 2, ES-28014, Madrid, Spain

Publication date: February 25, 2020

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