Curt Backeberg

Acanthocalycium is a genus of cactus consisting of several species from Argentina, Bolivia, Brazil, Paraguay and Uruguay. The taxon name comes from Greek akantha (meaning prickly) and kalyx (meaning buds), which refers to the spines on the floral tubes.

Turbinicarpus is a genus of very small to medium-sized cacti, which inhabit the north-eastern regions of Mexico, in particular the states of San Luis Potosí, Guanajuato, Nuevo León, Querétaro, Hidalgo, Coahuila, Tamaulipas and Zacatecas.

Armatocereus (from Latin armatus, "armed" and cereus, "pliant/soft") is a genus of mostly tree-like cacti from South America (Ecuador and Peru). These species have a conspicuous constriction at the end of the annual growth. The flowers are mostly white, with a more or less spiny ovary. The fruits are mostly spiny.

Austrocylindropuntia is a genus of cacti (family Cactaceae) with eight recognized species as of December 2025, which were once included in the genus Opuntia. All are native to South America, although some have been introduced elsewhere.

Weberbauerocereus is a genus of ceroid cactus, considered to be intermediate between the genera Trichocereus and Cleistocactus. The genus is named after Augusto Weberbauer because of his extensive research in the Peruvian Andes. The genus is native to Bolivia and Peru.

Haageocereus is a genus of cacti endemic to the lower elevations of the extremely dry desert along the coast of Peru and northern Chile.

The lava cactus is a species of cactus, Brachycereus nesioticus, the sole species of the genus Brachycereus. The plant is a colonizer of lava fields – hence its common name – where it forms spiny clumps up to 60 cm (24 in) tall. Its solitary white or yellowish white flowers open in the daytime. It is endemic to the Galápagos Islands.

Polaskia (named after American amateur Charles Polaski) is a genus of tree-like cacti reaching 4–5 m high, comprising 2 species. Both present primitive characteristics, but Polaskia chichipe is nearer to Myrtillocactus while Polaskia chende is nearer to Stenocereus. The genus is found in the Mexican states of Puebla and Oaxaca.

Coleocephalocereus is a genus of erect and semi-erect columnar cacti from Brazil. These species develop a cephalium with wool and bristles. They are common to the inselbergs of the Brazilian Atlantic rainforest, and can comprise a dominant portion of the flora in these isolated, dome-shaped rocky outcrops.

Micranthocereus is genus of cactus. It originates from Brazil and includes about 10species. The two genera Austrocephalocereus and Siccobaccatus have been brought into synonymy with this genus.

Cleistocactus strausii, the silver torch or wooly torch, is a perennial flowering plant in the family Cactaceae.

Brasilicereus is a genus of cacti known only from east Brazil and comprising two species.

Pygmaeocereus is a genus of small cacti (family Cactaceae). The genus is endemic to Peru. These species generally do not reach more than 100 mm (4 in) high, and produce a large tuberous root system and scented night flowers.

Mammillaria albiflora is a critically endangered species of cactus.

Gymnocalycium andreae is a species of Gymnocalycium from Argentina.

Acanthocalycium spiniflorum is a species of flowering plant in the cactus family Cactaceae from Argentina.

Mammillaria albilanata is a cactus species native to Mexico. The species is divided into four recognized subspecies: subsp. albilanata, subsp. oaxacana, subsp. reppenhagenii, and subsp. tegelbergiana. It occurs across the states of Chiapas, Colima, Guerrero, Oaxaca, and Puebla. This cactus typically grows as a solitary plant with a short, cylindrical form, although it can form clusters in cultivation. It can reach up to 15 cm in height and 8 cm in width. The flowers are small and colorful, ranging from carmine red to purplish pink, and are followed by red fruits with brown seeds. It is found

Jasminocereus (meaning "jasmine-like cereus", referring to the flowers) is a genus of cacti with only one species, Jasminocereus thouarsii, endemic to the Galápagos Islands, territorially a part of Ecuador. In English it is often called the candelabra cactus (a name used for other cacti with a similar appearance). At maturity it has a branched, treelike habit, and may be up to 7 m (23 ft) tall. The stems are made up of individual sections with constrictions between them. Its creamy white to greenish flowers open at night and are followed by greenish to reddish fruits.

Austrocylindropuntia subulata is a species of cactus native to the Peruvian Andes. The Latin specific epithet subulata means "awl-like", referring to the shape of the rudimentary leaves. It is also known by its common names as Eve's pin and Eve's needle.

Turbinicarpus lophophoroides is a species of plant in the family Cactaceae. It is a succulent cactus subshrub endemic to northeastern Mexico. Its natural habitats are subtropical or tropical dry lowland grassland and hot deserts. It is threatened by illegal collecting, habitat loss and insect parasitism. The species was first described as Thelocactus lophophoroides by Erich Werdermann in 1934. In 1937 Franz Buxbaum and Curt Backeberg placed the species in genus Turbinicarpus as T. lophophoroides.

Tephrocactus articulatus is a species of cactus in the subfamily Opuntioideae of the plant family Cactaceae, endemic to northern Argentina.

Rhipsalis cereoides is a species of plant in the family Cactaceae. It is endemic to Brazil. Its natural habitats are subtropical or tropical moist lowland forests and rocky areas. It is threatened by habitat loss.

Gymnocalycium castellanosii is a species of Gymnocalycium from Argentina.

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Turbinicarpus schmiedickeanus is a species of plant in the family Cactaceae.

Parodia chrysacanthion, the golden powder puff, is a species of cactus in the genus Parodia, native to northwest Argentina. It has gained the Royal Horticultural Society's Award of Garden Merit.

Harrisia divaricata is a species of cactus endemic to Hispaniola.

Frailea castanea is a species of Frailea found in Argentina, Brazil and Uruguay.

Ferocactus pottsii is a species of Ferocactus from Mexico. The specific epithet has also been spelt pottsi.

Cleistocactus tominensis is a species of columnar cactus in the genus Cleistocactus, endemic to Bolivia, where it is found in forests, on cliffs, and in inter-Andean valleys at altitudes of 900 to 2,200 meters.