Abstract
Croton macrosepalus Sodré & M.J.Silva (sp. nov.), a new species found in the states of Bahia, Goiás, and Tocantins, in Brazil, is described and illustrated. Although it is morphologically similar to Croton spica, the novel species can be differentiated from it by having large glandular stipules, entire or sometimes serrulate leaf margins, petioles with 2–8 cylindrical nectary glands at the apex, ovate pistillate sepals, and a hat-shaped caruncle. The habitat, conservation status, phenology, and morphological relationships of the species are also discussed. Morphological data and molecular analyses using ITS and trnL–trnF support the placement of C. macrosepalus and C. spica in Croton sect. Geiseleria. A geographic distribution map, images, notes about the leaf anatomy of both species, and their phylogenetic relationships are provided.
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Acknowledgements
The first and second authors thank Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the Master’s and Doctoral grants, respectively. The fourth author thanks Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for the grant on productivity (Process No. 307371/2013–1). All the authors thank Renato Galhardo Neto for the illustrations and Laboratório Multiusuário de Microscopia de Alta Resolução, of the Universidade Federal de Goiás, for the use of their equipment.
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Online resource 1. List of DNA sequences used in the study.
Online resource 2. ITS and trnL–trnF data matrix used in the study.
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Sodré, R.C., de Souza, A.O., Alonso, A.A. et al. Molecular, morphological, and anatomical data support a new species of Croton sect. Geiseleria (Crotonoideae, Euphorbiaceae). Plant Syst Evol 305, 233–246 (2019). https://doi.org/10.1007/s00606-019-1566-z
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DOI: https://doi.org/10.1007/s00606-019-1566-z