David Richard Hunt

Tradescantia pallida is a species of spiderwort native to the Gulf Coast region of eastern Mexico. It is a perennial herbaceous species with a trailing habit. The cultivar T. pallida 'Purpurea', commonly called purple heart or purple queen, is widely grown as a houseplant, outdoor container plant, or a garden groundcover. The species has been proven useful in indicating and removing air and soil pollutants and has also been used in food technology.

Selenicereus undatus, the white-fleshed pitahaya, is a species of the genus Selenicereus (formerly Hylocereus) in the family Cactaceae and is the most cultivated species in the genus. It is used both as an ornamental vine and as a fruit crop, the pitahaya or dragon fruit. Like all true cacti, the genus originates in the Americas. S. undatus is native from Mexico to Honduras; it may be a hybrid.

Astrophytum caput-medusae (synonym Digitostigma caput-medusae) is a species of cactus native to Mexico.

Selenicereus anthonyanus (also known by its obsolete name, Cryptocereus anthonyanus) is a cactus species native to southern Mexico. It is grown as an ornamental because of its nocturnal flowers and unusual, leaf-like stems. Common names include fishbone cactus, rickrack cactus, zig-zag cactus and St. Anthony's rickrack, and is sometimes referred to as an orchid cactus.

Graptopetalum bellum (syn. Tacitus bellus) is a species of flowering plant in the stonecrop family Crassulaceae, native to northern Mexico. It was discovered by Alfred Lau in 1972 in the states of Chihuahua and Sonora, at an altitude of 1,460 m (4,800 ft). It inhabits rocky terrain with moderate sun exposure. The Latin specific epithet bellum means "beautiful".

Pelecyphora missouriensis, the Missouri foxtail cactus and formerly Coryphantha missouriensis, is a species of low-growing North American cacti.

Echinopsis candicans, synonym Soehrensia candicans, is a species of cactus from northern Argentina. It has large fragrant white flowers that open at night.

Cleistocactus winteri is a succulent of the family Cactaceae. Its common name is the golden rat tail. Cleistocactus colademononis, which has gained the Royal Horticultural Society's Award of Garden Merit, is sometimes considered to be a subspecies, Cleistocactus winteri subsp. colademono.

Schlumbergera opuntioides is a species of plant in the family Cactaceae. It is endemic to the coastal mountains of south-eastern Brazil where its natural habitats are humid forests and rocky areas. It is threatened by habitat loss. It is in the same genus as the popular house plant known as Christmas Cactus or Thanksgiving Cactus.

Parodia tenuicylindrica is a species of cactus from the genus Parodia. The small green cacti have yellow and red-brown spines, white wool and yellow flowers. They produce yellow-green fruit, and black seeds. P. tenuicylindrica can be found growing individually in Rio Grande do Sul, Brazil.

Pelecyphora minima (syn. Coryphantha minima, Escobaria minima) is a rare species of cactus known by the common names Nellie cory cactus, Nellie's pincushion cactus, birdfoot cactus, and others. It is a very popular species among cactus collectors. This is one reason why it is a highly endangered species in the wild today. This cactus is found only in Brewster County, Texas, in the United States, where there are three populations remaining near Marathon. The cactus is limited to one outcrop in the Marathon Uplift, where it grows in rocky novaculite soils. It was added to the endangered species

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Mammillaria laui is a species of cactus in the genus Mammillaria, native to Tamaulipas state in Mexico. A number of subspecies were described, occurring along an elevation gradient; these are no longer accepted. It is listed as Critically Endangered (CR) in the wild.

Harrisia tetracantha is a species of cactus found in Bolivia.

Echinopsis haematantha, is a species of Echinopsis found in Argentina and Bolivia.

Cleistocactus samaipatanus is a species of flowering plant in the family Cactaceae, native to Bolivia.

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Pelecyphora robbinsiorum known by the common names Cochise pincushion cactus and Cochise foxtail cactus is a species of flowering plant in the family Cactaceae.

Echinopsis yuquina, synonym Lobivia rauschii, is a species of Echinopsis found in Bolivia.

Cereus mortensenii is a species of plant found in seasonally dry areas of Venezuela. It is the only Cereus species that develops a cephalium.

Callisia navicularis is a species of flowering plant in the family Commelinaceae. It has gained the Royal Horticultural Society's Award of Garden Merit as a warm temperate greenhouse ornamental.

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Sclerocactus brevihamatus is a species of cactus known by the common name shorthook fishhook cactus. It is endemic to Texas, and is an endangered species. Threats to the species and subspecies include collecting and development in its habitat.

Oreocereus hempelianus is a species of cactus native to Peru and Chile.