European Journal of Taxonomy 639: 1–24 ISSN 2118-9773 https://doi.org/10.5852/ejt.2020.639 www.europeanjournaloftaxonomy.eu 2020 · Rocha A.C. & Melo J.I.M. This work is licensed under a Creative Commons Attribution License (CC BY 4.0). Research article Diversity and distribution of Ludwigia (Onagraceae) in Paraíba State, Northeastern Brazil Amanda Macêdo ROCHA 1,* & José Iranildo Miranda de MELO 2 1 State University of Bahia, Department of Education, Postgraduate Programme in Vegetal Biodiversity, HUNEB Herbarium (Collection Paulo Afonso), Campus VIII, Rua do Gangorra, 503, Paulo Afonso, Bahia, CEP: 48600-000, Brazil. 2 State University of Paraíba, Biological Sciences and Health Center, Department of Biology, Campina Grande, Paraíba, CEP: 58429-500, Brazil. * Corresponding author:
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[email protected] Abstract. This paper provides a taxonomic assessment and distribution details of the species of the genus Ludwigia L. (Onagraceae) for the Paraíba State, Northeastern Brazil. Six species were found: L. erecta (L.) H.Hara, L. helminthorrhiza (Mart.) H.Hara, L. hyssopifolia (G.Don) Exell, L. leptocarpa (Nutt.) H.Hara, L. nervosa (Poir.) H.Hara and L. octovalvis (Jacq.) P.H.Raven. Ludwigia nervosa was recorded for the first time in the studied area. Our taxonomic treatment comprises an identification key to the species. For each species, description, illustrations, taxonomic comments, flowering and fruiting data, geographic distribution map, and the conservation status for the studied area are provided. Among the recorded species, three were classified as “Near Threatened”, two as “Vulnerable” and one as “Critically Endangered”. Keywords. Conservation, Brazilian flora, Ludwigioideae, taxonomy. Rocha A.C.