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Issue: Vol. 705 No. 3: 17 Jun. 2025
Type: Article
Published: 2025-06-17
DOI: 10.11646/phytotaxa.705.3.6
Page range: 287-294
Abstract views: 272
PDF downloaded: 16

A critically endangered new species of Croton section Barhamia (Euphorbiaceae) from the Cerrado hotspot, Brazil

Secretaria de Estado da Educação de Goiás, Centro de Ensino em Período Integral José Peixoto, 75470-000, Nova Veneza, GO, Brazil
Programa de Pós-graduação em Biodiversidade Vegetal e Meio Ambiente, Instituto de Pesquisas Ambientais—Unidade Jardim Botânico, São Paulo, Brazil
Instituto Federal de Educação, Ciência e Tecnologia de Goiás, Campus Águas Lindas de Goiás, ÁREA Especial 4, Jardim Querência, 72910-733, Águas Lindas de Goiás, GO, Brazil
Programa de Pós-graduação em Biodiversidade Vegetal e Meio Ambiente, Instituto de Pesquisas Ambientais—Unidade Jardim Botânico, São Paulo, Brazil; Universidade Federal de São Paulo-Unifesp. Instituto de Ciências Ambientais, Químicas e Farmacêuticas-ICAQF, Departamento de Ecologia e Biologia Evolutiva
Universidade Federal de Goiás, Instituto de Ciências Biológicas, Departamento de Botânica, Laboratório de Morfologia e Taxonomia Vegetal, CP 131, 74001-970, Goiânia, GO, Brazil
cerrado rupestre Chapada dos Veadeiros Croton arirambae Crotoneae endemism Eudicots

Abstract

A new species of Croton endemic to the Cerrado hotspot (Brazil) is here described and illustrated. Croton rizzoi is assigned to section Barhamia subsect. Medea due to its foliage not viscid, entire leaf margins, pinnate venation, glandular stipules and sepals of pistillate flowers. The new species is most closely related to C. arirambae from the Northern region of Brazil, but differs by having stipules with stipitate-capitate glands with subglobose or ovoid secretory portion, elongate thyrses (up to 11 cm long), anthers 1.4–1.7 mm long, with papillose surface and 2-fid styles. Croton rizzoi has its geographic distributions, morphological relationships, phenology conservation status, and systematic position presented.

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How to Cite

Sodré, R.C., Pereira, A.D.P.N., Mendes, T.P., Caruzo, M.B.R. & Silva, M.J.D. (2025) A critically endangered new species of Croton section Barhamia (Euphorbiaceae) from the Cerrado hotspot, Brazil. Phytotaxa 705 (3): 287–294. https://doi.org/10.11646/phytotaxa.705.3.6