A cactus is a member of the plant family Cactaceae[a], which has about 127 genera and about 1750 recognized species. Cactaceae belongs to the order Caryophyllales. [4] The Latin word “cactus” is derived from the Ancient Greek word “kktos,” which Theophrastus first used to refer to a spiky plant whose identify is currently unknown. [5] There are many different sizes and shapes of cacti. Most cactus reside in settings that experience at least some drought, despite the fact that some species can tolerate fairly humid situations. Many of them can even be found in the Atacama Desert, one of the driest places on Earth, where they exist in extremely dry circumstances. Cacti have developed a variety of adaptations to conserve water as a result. As an illustration, nearly all cacti are succulents, which means that their swollen, fleshy sections are designed to store water. Unlike many other succulents, most cacti only have a stem where this crucial process occurs. The majority of cacti species no longer have actual leaves; instead, they only have spines, which are heavily modified leaves. Spines help limit water loss by slowing air movement around the cactus and offering some shade, in addition to protecting it from herbivores. Photosynthesis is performed by cacti’s expanded stems in the lack of real leaves. Except for Rhipsalis baccifera, which also grows in Africa and Sri Lanka, all of the Americas, from Patagonia in the south to sections of western Canada in the north, are home to cacti.
Areoles, a type of greatly shortened branch, are specialized structures that create cactus spines. Cacti can be identified by their areoles. Areoles also produce multipetalled, tubular blooms in addition to spines. Because many cacti have extended dormant periods and short growing seasons, they may respond fast to any rainfall. This is made possible by their large but shallow root systems, which swiftly absorb any water that reaches the ground surface. Because cactus stems are frequently ribbed or fluted, they can easily stretch and contract to quickly absorb water after rain and then hold onto it during protracted droughts. The majority of cacti use a unique process called “crassulacean acid metabolism” (CAM) as part of photosynthesis, similar to other succulent plants. Unlike photosynthesis, which occurs during the day, transpiration—during which carbon dioxide enters the plant and water escapes—occurs at night. The plant converts the carbon dioxide it absorbs into malic acid and stores it there until daybreak, when it is solely used for photosynthesis. The cooler, more humid nighttime hours are when transpiration occurs, which greatly reduces water loss.
The globe-shaped stems of many smaller cacti combine the maximum volume of water storage with the smallest surface area of transpiration loss. The largest[b] free-standing cactus is Pachycereus pringlei, which reaches a maximum height of 19.2 m (63 ft)[7], while Blossfeldia liliputiana has the lowest diameter at maturity, measuring just around 1 cm (0.4 in). [8] During a downpour, a mature saguaro (Carnegiea gigantea) is believed to be capable of soaking up 200 US gallons (760 l; 170 imp gal) of water. [9] Only a few species look significantly like the rest of the family. Plants belonging to the genera Leuenbergeria, Rhodocactus, and Pereskia resemble nearby trees and bushes, at least on the surface. They have enduring leaves and, as they age, stems covered with bark. Despite their appearance, they are recognized as cacti by their areoles and have numerous water-saving adaptations. Leuenbergeria is thought to be very closely related to the original species from which all cacti descended. Other cacti develop as forest climbers and epiphytes in tropical areas (plants that grow on trees). Their stems often have fewer or even no spines and are flattened, almost leaf-like in appearance, like the well-known Christmas or Thanksgiving cactus (in the genus Schlumbergera).
Many types of cacti are produced as beautiful plants, while others are raised for fodder or forage, and yet others are utilized as food (particularly their fruit). An bug that lives on some cactus produces cochineal.
Many succulent plants, both in the Old and New Worlds, have spiky stems, including some members of the Euphorbiaceae (euphorbias), which is why they are frequently mistakenly called “cactus.”
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Cacti exist everywhere in the planet.
The family of cactus plants includes unusual plants that come in a variety of sizes and shapes. The majority of cacti species, with the exception of four tropical species, are native to America, despite the fact that these succulents can be found all over the world. Like every group of living organisms, there are a wide range of variances among the various cacti species.
Each cactus species is actually perfectly suited to flourishing in particular habitats with a particular environment. For instance, the majority of the Echinocereus genus species are frost-tolerant and cold-hardy.
So, where can you locate cacti around the world? The majority of cacti species are often found in hot, dry climates in North and South America. These desert plants are common throughout Mexico, Canada, and much of the Southwest of the United States. They are typically found in Brazil in South America. Some cacti species are also found in Central America and nearby islands like the Galapagos and the Caribbean. The single exception is Rhipsalis baccifera, which grows in portions of tropical America, Madagascar, Mauritius, and tropical Africa.
Discover everything you need to know about this remarkable desert plant, including its habitat, by reading on. We go through crucial information that will broaden your knowledge.
What are the top ten cacti in popularity?
Many people want to include outdoor areas in their homes. Fortunately, having a green thumb is not necessary to accomplish that. For individuals who want to add a touch of green but struggle to keep conventional plants alive or who simply don’t have the time to devote to a garden, cacti and succulents are low-maintenance and easy-to-care-for solutions.
What cactus species are the most widely grown? According to cactus growers and aficionados, the most common varieties of cactus are:
- Lunar cactus
- Cactus Ladyfinger
- Cactus of Easter
- Senior woman cactus
- rabbit ear cactus
- Columnar cactus in blue
- Cactus stars
- Container cactus
- The fairy castle cacti
- Calypso saguaro
Why are they so well-liked? We will go into great depth about each one, including how simple or challenging it is to take care of and spread them.
Which nations are cactus native to?
Numerous kinds of blooming plants with succulent (water-storing) stems belong to the family Cactaceae. Cacti are unique among all other plants due to the existence of an organ called the areole. Flowers, new branches, and spines emerge from areoles. Spines come in a variety of shapes and sizes; some are delicate and feathery to shield the plant from harsh sunlight, while others are strong and spiky to provide protection. The spines on cacti restrict animals from getting to their water supply, even though they may be one of the few sources of water in arid areas. Cacti have a waxy covering called a cuticle that serves as a barrier against water loss. They also use stomata, which open at night instead of during the day like other plants do, to conserve water. The plant’s stomata are tiny pores that allow carbon dioxide to enter for photosynthesis.
The size of cacti varies according on the species. Blossfeldia liliputana, a South American plant with a mature diameter of less than an inch (2.5 centimeters), may be the smallest cacti species. The Mexican enormous cardon, which is almost 60 feet tall, is the tallest cactus (18 meters).
The majority of cacti genera originated in the Americas and can be found from Canada to Chile. They are now widespread around the world, particularly in Australia, South Africa, and nations in the Mediterranean.
Some people mistakenly believe that cacti are only found in the desert, yet many species, like the prickly pear cactus, may be found in a variety of settings.
Cacti are seed-producing blooming plants. They are able to bloom every year, but when it rains a lot, they will produce a lot of flowers. Different flowers have different looks and smells to draw different pollinators, like insects and bats. Cacti grow slowly and have a long lifespan. Saguaro cacti, for instance, can survive for up to 175 years. Between the ages of 75 and 100, they do not develop their first arms.
Populations of cacti are generally stable. However, some species are diminishing as a result of being taken out of the wild and planted on xeriscaped lawns as decorative plants (landscaped areas that require little or no irrigation).
Most cacti have root systems that stretch out near the ground to absorb as much precipitation as they can. Some species can survive several years of drought because they are adept at storing water.
UCN blanket assessment of cacti
Given that the distribution range is a significant predictor of extinction risk, the discovery that plant species, and notably cacti, have on average smaller geographic range widths than other living animals (Gaston, 2003) is extremely concerning. The Global Strategy for Plant Conservation (Joppa, 2013) has listed one of its primary goals for 2020 as assessing the threat level of all plant species as a solution to this issue.
It is disturbing that these occasionally desert ecosystems have not drawn as much attention to conservation as other Neotropical biomes like the tropical woods given that the charismatic Cactaceae are primarily found in the New World dry plains (think cactus and cowboy) (Durant, 2012).
According to our research, the following regions have the highest concentrations of vulnerable cactus species:
- a severely constrained area (area = c. 500 km2) in northern Artigas, Uruguay, and the southern Rio Grande do Sul, Brazil, which likewise exhibits a surge in the percentage of species under threat of extinction;
- the Mexican states of Quertaro and San Luis Potos, as well as the Tehuacn-Cuicatln region in Oaxaca and Puebla;
- Eastern Brazil, in northern Minas Gerais and eastern Bahia;
- Chile, in Antofagasta’s southern region;
- Southeast Uruguay.
The peaks of threatened species richness in this plant family are extremely constrained, reflecting a fact that is well-known to cactus enthusiasts around the world: many cacti have particularly small geographic range sizes. This is demonstrated by a comparison of the species distribution area and the level of risk of the species.
Brazilian Cactus Action Plan
In order to support their protection, it is crucial to understand the southern state species of Brazilian cactus. The majority of populations are small and isolated in rocky outcrops scattered throughout the grassy Pampa biome, and the protection of these small, isolated populations is not served by the establishment of sizable parks and reserves. Joo Larocca, one of the researchers, is currently collaborating with local landowners to establish private reserves called as Reservas Particulares do Patrimnio Natural in Brazil (RPPNs). He has created a management strategy to forward this effort, but the major obstacles are a lack of money and the need to consider populations of cactus that exist in Uruguay and Argentina across the border.
One of the main dangers to the species in Eastern Brazil, the main center of Brazilian cactus variety (Taylor & Zappi, 2004), is the fact that many of these plants require a very particular type of soil. With the extensive mining of the iron-rich substrate, the spread of the Arthrocereus glaziovii, which lives in iron ore, around Belo Horizonte has decreased. The critically endangered species Arrojadoa marylaniae is only found in Bahia, where pristine quartzitic rock is being examined for quarrying. Similarly, Coleocephalocereus purpureus only grows atop inselbergs of pink granite in northern Minas Gerais, south of the border; this rock is highly prized by the construction industry. The action plan draws attention to instances like this so that the governing bodies can formulate a reaction when a region is targeted for exploitation.
Are there male or female cacti?
A Florida scientist discovered a cactus with an interesting sexual life while researching bats in Mexico. The cardon cactus has three sexes—male, female, and hermaphrodite—and is therefore “trioecious.” Among the 1,600 cactus species, only the cardon is known to be trioecious, according to Ted Fleming, a biologist at the University of Miami. The majority of cactus species are hermaphrodites—they have both male and female reproductive organs in each flower—and depend on animals like birds, insects, and bats to spread pollen among the plants, but the cardon has evolved numerous reproductive strategies. Hermaphrodite plants have the ability to fertilize themselves, other hermaphrodites, or male plants to do so. A hermaphrodite or a male plant can fertilize a female plant. Fleming is still researching the cardon cactus to see if any of its reproduction methods are more effective than others.