Ludwig Georg Karl Pfeiffer

Cephalocereus is a genus of slow-growing, columnar-shaped, blue-green cacti. The genus is native to Mexico.

Opuntia microdasys (angel's-wings, bunny ears cactus, bunny cactus or polka-dot cactus) is a species of flowering plant in the cactus family, Cactaceae. It is native and endemic to central and northern Mexico.

Echinopsis oxygona, also known as Eyries cactus, Easter lily cactus or sea-urchin cactus, is a species of flowering plant in the cactus family Cactaceae, native to south Brazil, Uruguay, Paraguay and northeastern Argentina. Some species that have been described separately, including Echinopsis eyriesii and Echinopsis tubiflora, are now considered to be synonymous. The features of the species include a large flower, with sharply pointed lavender or white petals, and a sweet scent.

Discocactus is a genus of tropical cacti. Discocactus plants are endemic to southern Brazil, eastern Bolivia, and northern Paraguay. These species are in the risk of extinction in the wild.

Lepismium is a genus of mostly epiphytic cacti, with seven species. They are found in tropical South America.

Cephalocereus senilis, the old man cactus, is a species of cactus native to Hidalgo and Veracruz in central Mexico. It is threatened in the wild, but widespread propagation and popularity in cultivation have reduced the demand on wild populations.

Cranichideae is an orchid tribe in the subfamily Orchidoideae.

Opuntia robusta, the wheel cactus, nopal tapon, or camuesa, is a species of cactus in the family Cactaceae. It is native and endemic to central and northern Mexico to within 100 miles (160 km) of the Arizona and New Mexico borders where it grow from 5,000 to 10,000 feet (1,500 to 3,000 m) on rocky slopes, open shrub lands, woodlands and mixed with other cactus and succulents.

Rhipsalis floccosa is a species of plant in the family Cactaceae. It is found in Argentina, Bolivia, Brazil, Paraguay, Peru, and Venezuela. Its natural habitat is subtropical or tropical moist lowland forest. It is threatened by habitat loss.

Mammillaria carnea is a species of cactus in the subfamily Cactoideae.

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Rhipsalis crispata is a species of terrestrial plant in the family Cactaceae. It is endemic to Brazil. Its natural habitats are subtropical or tropical dry forest and subtropical or tropical moist lowland forest.

Porella platyphylla is a species of liverwort belonging to the family Porellaceae. It has a Holarctic distribution, occurring across Eurasia and North America, where it typically grows on tree bark and rocks in areas with adequate rainfall. The species is most common in regions receiving at least 600 millimetres of annual precipitation. The species forms part of a complex taxonomic group that includes several closely related species and hybrids, with populations showing distinct genetic differences between continents despite their morphological similarity. The species is characterised by its

Melocactus violaceus is a species of plant in the family Cactaceae. It is endemic to Brazil. Its natural habitats are dry savanna and sandy shores. It is threatened by habitat loss.

Melocactus curvispinus is a species of Melocactus found from southern Mexico to Venezuela.

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Opuntia auberi is a flower plant species belonging to the family Cactaceae. It is native to Central America in Cuba and the Antilles.

Mammillaria uncinata is a species of cactus in the family Cactaceae. It is endemic to Mexico.

Mammillaria supertexta is a species of cactus in the tribe Cacteae. It is native to Oaxaca, Mexico.

Mammillaria haageana is a species of cacti in the tribe Cacteae. It is native to Mexico, where it is found commonly, and is widespread throughout much of the country.

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Mammillaria nivosa is a species of cactus also known by the name woolly nipple cactus and is native to the Caribbean.

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