A cactus is a member of the plant family Cactaceae, a family comprising about 127 genera with some 1,750 known species of the order Caryophyllales. The word cactus derives, through Latin, from the Ancient Greek word κάκτος (káktos), a name originally used by Theophrastus for a spiny plant whose identity is now not certain. Cacti occur in a wide range of shapes and sizes. They are native to the Americas, ranging from Patagonia in the south to parts of western Canada in the north, with the exception of Rhipsalis baccifera, which is also found in Africa and Sri Lanka. Cacti are adapted to live in very dry environments, including the Atacama Desert, one of the driest places on Earth. Because of this, cacti show many adaptations to conserve water. For example, almost all cacti are succulents, meaning they have thickened, fleshy parts adapted to store water. Unlike many other succulents, the stem is the only part of most cacti where this vital process takes place. Most species of cacti have lost true leaves, retaining only spines, which are highly modified leaves. As well as defending against herbivores, spines help prevent water loss by reducing air flow close to the cactus and providing some shade. In the absence of true leaves, cacti's enlarged stems carry out photosynthesis.
Euphorbia is a very large and diverse genus of flowering plants, commonly called spurge, in the family Euphorbiaceae.
Pachypodium is a genus of succulent spine-bearing trees and shrubs, native to Madagascar and Africa. It belongs to the family Apocynaceae.
Echinopsis is a genus of cacti native to South America, sometimes known as hedgehog cactus, sea-urchin cactus or Easter lily cactus. As of October 2023, there are about 20 accepted species, ranging from large and treelike types to small globose cacti. The name derives from echinos hedgehog or sea urchin, and opsis appearance, a reference to these plants' dense coverings of spines.
Matucana is a genus of cacti, containing approximately 20 species of mostly globular plants. The genus is known only from Peru, mostly along the Marañón River.
Parodia is a genus of flowering plants in the family Cactaceae, native to the eastern slopes of the Andes in northwestern Argentina and southwestern Bolivia and in the lowland pampas regions of northeastern Argentina, southern Brazil, eastern Paraguay, and Uruguay. This genus has about 65 species, many of which have been transferred from Eriocactus, Notocactus and Wigginsia. They range from small globose plants to 1 m (3 ft) tall columnar cacti. All are deeply ribbed and spiny, with single flowers at or near the crown. Some species produce offsets at the base. They are popular in cultivation, but must be grown indoors where temperatures fall below 10 °C (50 °F).
Rhipsalis is a genus of epiphytic flowering plants in the cactus family, typically known as mistletoe cacti. They are found in parts of Central America, the Caribbean and northern regions of South America. They also inhabit isolated locations in Africa and Asia, and are the only cactus group naturally occurring in the Old World. This is the largest and most widely distributed genus of epiphytic cacti.
Hatiora is a small genus of epiphytic cacti which belongs to the tribe Rhipsalideae within the subfamily Cactoideae of the Cactaceae. Recent taxonomic studies have led to the three species formerly placed in subgenus Rhipsalidopsis being removed from the genus, including the well known and widely cultivated ornamental plants known as Easter cactus or Whitsun cactus.
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.
Thomas Guy "Tom" Hart Dyke is an English horticulturist, author and plant hunter from the Hart Dyke family. He is the son and heir of Guy and Sarah Hart Dyke at the family seat of Lullingstone Castle, Eynsford, Kent. He is the designer of the World Garden of Plants located on the property. The World Garden contains approximately 8,000 species of plants, many collected by Hart Dyke from their native environments. He presented an episode of Great British Garden Revival in 2013. Tom Hart Dyke is a patron of the charity the British Cactus & Succulent Society.
Kroenleinia grusonii, popularly known as the golden barrel cactus, golden ball, "mother-in-law's cushion" or "mother-in-law’s chair" is a species of barrel cactus which is endemic to east-central Mexico.
The Cactus and Succulent Society of America (CSSA) is a horticultural society which is based in Pasadena, California.
In botany, succulent plants, also known as succulents, are plants with parts that are thickened, fleshy, and engorged, usually to retain water in arid climates or soil conditions. The word succulent comes from the Latin word sucus, meaning "juice" or "sap".
Gymnocalycium mihanovichii is a species of cactus from South America. The most popular cultivars are varied mutants which completely lack chlorophyll, exposing the red, orange, or yellow pigmentation. These mutant strains are often grafted onto the hylocereus cactus, and the combined plant is called a "Moon Cactus". Moon cacti are commonly grown as houseplants and are also known as Ruby Ball, Red Cap, Red Hibotan, or Hibotan cacti.
A cactarium or cactuario is a garden dedicated to the planting of cacti. While they generally specialize in collecting cacti, they can also include other desert plants such as sabla, agaves or Crassulaceae, although this would better be termed "xeriscaping".
Hatiora salicornioides, the bottle cactus, dancing-bones, drunkard's-dream, or spice cactus, is a species of flowering plant in the cactus family. A member of the tribe Rhipsalideae, it often grows as an epiphyte, natively in eastern Brazil and ornamentally elsewhere.
Sclerocactus mesae-verdae, the Mesa Verde cactus or Mesa Verde fishhook cactus, is a species of cactus native to northwestern New Mexico and southwestern Colorado. It is known only from Montezuma County (Colorado) and San Juan County. Much of the New Mexico part of the range lies inside land controlled by the Navajo Nation. The Colorado populations lie close to Mesa Verde National Park.
Vera Higgins (1892-1968) was a British botanist, author, translator and botanical illustrator known for being an authority on succulents and cacti, particularly Crassulaceae. She graduated from Cambridge University and worked at the National Physical Laboratory. Higgins was the first editor of The Cactus Journal of the Cactus & Succulent Society of Great Britain, beginning in 1931 and continuing until 1939 when the Society closed because of World War II. She then edited the Journal of the Royal Horticultural Society between 1939 - 1945. She was elected a fellow of the Linnean Society of London in 1945 and was awarded the Royal Horticultural Society Victoria Medal of Honour in 1946.
Gordon Douglas Rowley (1921–2019) was a British botanist and writer specialising in cacti and succulents.
Wendell S. Minnich, better known as "Woody" Minnich, is an American field explorer, photographer, grower, and lecturer primarily known for his extensive field documentation of cacti and succulents.
