Melocactus pachyacanthus Melocactus pachyacanthus Buining & Brederoo in Kakteen And. Sukk. 27(1): 1. 1975 sec. Zappi & Taylor 20201≡Melocactus pachyanthus Buining & Brederoo in Kakteen And. Sukk. 27: 1. 1975 syn. sec. The Plant List v. 1.1 201321. Zappi, D. & Taylor, N. P. 2020: Cactaceae in Flora do Brasil. – Jardim Botânico do Rio de Janeiro – http://floradobrasil.jbrj.gov.br, 2. TPLContent