Arnold J. Brederoo

Melocactus conoideus is a species of plant in the family Cactaceae. It is a succulent cactus subshrub endemic to northeastern Brazil. It is native to the Serra do Periperi of Vitória da Conquista municipality in southwestern Bahia state. It grows in the transition from eastern Caatinga dry shrubland to campo rupestre montane savanna from 1,000 to 1,200 meters elevation. This species spreads by bearing fruit with seeds that ants take and transport to other locations that it can grow. It is threatened by habitat loss, and the IUCN Red List assesses the species as Critically Endangered.

Melocactus glaucescens is a species of plant in the family Cactaceae. It is endemic to Brazil. Its natural habitats are rocky areas and hot deserts. It is threatened by habitat loss. Melocactus glaucescens is identified by its glaucous appearance and its often whitish-yellow cephalium. The color of its cephalium varies slightly based on population.

Melocactus deinacanthus, also known as the Wonderfully Bristled Turk's-Cap Cactus is a species of plant in the family Cactaceae. It is endemic to Brazil. Its natural habitat is rocky areas. It is threatened by habitat loss.

Melocactus azureus is a species of cactus. It is endemic to Brazil, where it is known only from Bahia. It is locally abundant but the populations are fragmented and vulnerable to habitat degradation.

Frailea mammifera is a species of Frailea from Bolivia and Argentina. It is a small cactus. It blooms with a flower that is larger than the plant.

Melocactus pachyacanthus is a species of cactus. It is endemic to Brazil, where it is known only from two locations in Bahia. Its populations are fragmented and it is vulnerable to habitat degradation.

Micranthocereus auriazureus is a species of cactus. It is endemic to Brazil, where it is known only from Minas Gerais.

Melocactus levitestatus is a species of cactus of the genus Melocactus found in Brazil.

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Frailea curvispina is a species of Frailea from Brazil.

Facheiroa cephaliomelana is a species of plant in the family Cactaceae.

Discocactus horstii is a species of Discocactus found in Brazil.

Discocactus ferricola is a species of Discocactus found in Bolivia and Brazil.

Arrojadoa dinae is a species of plant in the family Cactaceae. It is endemic to Brazil. Its natural habitat is dry savanna. It is threatened by habitat loss. The main threats are deforestation for Eucalyptus plantations used for charcoal production. Collection of the plant and fires can impact on its reproductive capacity.

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Micranthocereus flaviflorus is a species of Micranthocereus found in Brazil.

Discocactus catingicola is a species of Discocactus found in Brazil.

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Arthrocereus spinosissimus is a species of cactus in the subfamily Cactoideae from Brazil.

Pilosocereus magnificus is a species of plant in the family Cactaceae. It is endemic to Brazil, within Minas Gerais state. Its natural habitats are subtropical or tropical dry forests, subtropical or tropical dry shrubland, and rocky areas. It is threatened by habitat loss.