RESUMO São propostas as sinonimizações de quatro espécies e de duas variedades: Crotalaria brasiliensis Windler & S.G. Skinner em Crotalaria grandiflora Benth., Crotalaria barretoensis Windler & S.G.Skinner em Crotalaria martiana Benth.subsp. martiana, Crotalaria hatschbachii Windler& S.G.Skinner, Crotalaria hatschbachii var. sericea Windler & S.G.Skinner, Crotalaria bellii Windler & S.G. Skinner e Crotalaria flavicoma var. major Micheli em Crotalaria martiana subsp. mohlenbrockii (Windler & S.G.Skinner) Planchuelo. Também são propostos a transferência de C. paraguariensis da sinonímia de C. martiana subsp. martiana para C. martiana subsp. mohlenbrockii e o restabelecimento de C. subdecurrens Mart. ex Benth. à categoria específica.
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