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Argythamnia (Euphorbiaceae) from biogeographic provinces of the Chaco and Pampa in South America

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Abstract

Argythamnia (Euphorbiaceae) comprises approximately 70 species and is widely distributed in the New World, mainly restricted to seasonal environments. It is represented by seven species in the biogeographic provinces of the Chaco and Pampa, which are characterized by vegetation mosaics of grasslands and forests. Some species are poorly known, with only 3–5 collections restricted to specific areas, whereas others have many records and a wide distribution throughout these two provinces. Morphological similarities among many species make identification difficult. After several expeditions to observe and collect samples in the field, bibliographic revision, and examination of herbarium specimens, we present a taxonomic treatment of Argythamnia in the Chaco and Pampa provinces, where we recognize five species and provide descriptions, an identification key, and a distribution map. In addition, we propose three synonyms, four neotypifications, four lectotypifications, and report the first records of A. salina in Brazil, and the first record of A. montevidensis in the Chaco from the state of Mato Grosso do Sul, Brazil, a species known to date in this country only from the Pampa of Rio Grande do Sul state.

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Acknowledgements

We are thankful to Cassio Rabuske da Silva, Eduardo Valduga, Felipe Gonzatti, Fernando Furquim, Gabriele Dachi, Guilherme Peres Coelho, Leonardo Nogueira, Matias Köhler, and Marcus Vinicius Soares for their support during fieldwork. We thank the curators and technicians of the herbaria consulted (ACOR, BA, BAA, CGMS, COR, CORD, CPAP, CTES, ECT, FLOR, HAS, ICN, MBM, MVFA, MVJB, MVM, NY, PACA, PEL, R, RB, SI, SP, SPF, and US). The authors also thank the reviewers of the manuscript.

Funding

A portion of the research was funded by a grant from the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES) Finance Code 001; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for financial support to IC (CNPq 309917/2015–8), JFAB (Produtividade em Pesquisa), and JI (311847/2021–8, 402157/2022–2, 403808/2021–9), and Neotropical Grassland Conservancy for financial support to JI.

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Authors and Affiliations

  1. Programa de Pós-Graduação em Botânica, Escola Nacional de Botânica Tropical, Instituto de Pesquisas Jardim Botânico Do Rio de Janeiro, Rua Pacheco Leão, 2040, Solar da Imperatriz, Horto, Rio de Janeiro, RJ, CEP: 22460-030, Brazil

    Josimar Külkamp & José F. A. Baumgratz

  2. Departamento de Botânica, Universidade Federal de Pelotas, Campus Capão Do Leão, Caixa Postal 354, Pelotas, RS, 96010-900, Brazil

    Josimar Külkamp & João R. V. Iganci

  3. Programa de Pós-Graduação Em Botânica, Universidade Federal Do Rio Grande Do Sul, Av. Bento Gonçalves, 9500 - Bloco IV - Prédio 43433, Porto Alegre, RS, 91501-970, Brazil

    João R. V. Iganci

  4. Instituto de Pesquisas Ambientais, Núcleo de Conservação da Biodiversidade, Av. Miguel Stefano, 3687 Água Funda, São Paulo, SP, 04301-012, Brazil

    Inês Cordeiro

Authors
  1. Josimar Külkamp
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  2. João R. V. Iganci
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  3. Inês Cordeiro
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  4. José F. A. Baumgratz
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Contributions

JK: Conceptualization, investigation, field expedition, discussion, preparation of the map and figures, and writing (original draft). JI: data resources, field expedition, investigation, discussion, and writing (review and editing). JFAB: investigation, discussion, writing (review and editing). IC: discussion, and writing (review and editing).

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Correspondence to Josimar Külkamp.

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Associate Editor: Jordan Hoffman

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Külkamp, J., Iganci, J.R.V., Cordeiro, I. et al. Argythamnia (Euphorbiaceae) from biogeographic provinces of the Chaco and Pampa in South America. Brittonia 75, 393–410 (2023). https://doi.org/10.1007/s12228-023-09758-8

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