Albert Frederik Hendrik Buining

Uebelmannia is genus of cacti, native to southeast Brazil. In a 2023 classification of the tribe Cereeae, it was placed as the only genus in the subtribe Uebelmanniinae, having formerly been placed in the subtribe Rebutiinae.

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.

Uebelmannia pectinifera is a species of plant in the family Cactaceae. It is a succulent cactus subshrub endemic to Minas Gerais state in southeastern Brazil. Its natural habitats are dry savanna and rocky areas. It is threatened by habitat loss.

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.

Gymnocalycium horstii is a globular cactus resembling a loaf of bread.

Uebelmannia gummifera is a species of plant in the family Cactaceae. It is succulent cactus subshrub endemic to southeastern Brazil. Its natural habitat is dry savanna. It is threatened by habitat loss.

Viridicereus is a monotypic genus of flowering plant in the cactus family Cactaceae. Its only species is Viridicereus violaciflorus, endemic to southeast Brazil, previously known as Micranthocereus violaciflorus and Arrojadoa violaciflora.

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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Matucana ritteri is a species of Matucana found in Peru.

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.

Coleocephalocereus goebelianus is an endangered species of plant in the family Cactaceae. It is endemic to Brazil, where it is confined to the state Minas Gerais and Bahia. Its natural habitat is the seasonally dry tropical forest. Due to major differences to the rest of Coleocephalocereus, the monotypic genus Mariottia has been erected by Guiggi. However, this treatment is not accepted by most authorities.

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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