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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Are there cactus in the deserts of Africa?
Here are several examples:
The African Peyote Cactus thrives in arid climates. Long-lasting water retention is provided by its thick stems. Its spiky leaves aid in preventing evaporation-related water loss. Peyote from this plant is used by local Saharan tribes in
their sacramental practices. The African peyote cactus only relies on the water it stores in its thick stem after each rainstorm to survive till the next one. It requires very little sunlight to survive and prefers PH 6 or 7 soil. Seeds or the shoots of an established plant might be used to start the plant.
Palm trees typically flourish in regions where the water is nearer the land’s surface. These particular trees are oriented from east to west and are organized in short lines. The desert palm grows around towns where people drill wells to obtain water.
A significant tree that thrives in numerous locations along the Nile River in North Africa is the olive tree. This tree is grown for its oil, which is used in cooking. The olive tree’s thin leaves have a protective layer that prevents water loss, allowing it to thrive in the hot, dry conditions.
The poisonous tobacco tree is a native of South America, but it has adapted to life there. The white, green, red, or yellow flowers on this tree may bloom at night. You might believe that this tree’s leaves can be smoked, but that is untrue. Dizziness and impaired eyesight are symptoms of poisoning. Another side effect of the tobacco tree is auditory hallucinations.
Tamarisk (Shrub) is a saline or alkaline-loving plant that can reach heights of up to 18 meters. It frequently serves as shade and is utilized for carpentry and firewood. Tamarisk can also block the wind. It features racemes of white, pink, or red flowers as well as small, scale-like leaves. It also has tiny, slender branches and broad, deep roots.
A dioecious shrub with densely branching, upright stems is called ephedra alata. It produces flowers with four to six anthers and very small leaves. This plant’s alkaloids are responsible for much of its action. There are numerous medical uses for its plants.
Cacti can be found in the Sahara Desert?
Life of every type can be found in the Sahara and its oases and plateaus. Beyond the vegetation mentioned above, you can anticipate to see figs, oranges, acacia trees, tobacco plants, oleander, peyote cacti, and a great deal more.
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.
Can you find cactus in South Africa?
EVEN though South Africa is home to several native succulents, there is only one native cactus.
Additionally, this plant doesn’t resemble a cactus in the least bit. Elsa Pooley’s Guide to Wild Flowers of KwaZulu-Natal and the Eastern Region describes it as a straggling pendulous epiphytic succulent under the name Rhipsalis baccifera. It only has clumps of innocuous fuzzy spines rather than actual spikes. It resembles mistletoe somewhat thanks to its luscious white (sometimes pink or red) berries, which is presumably how it got its common name, mistletoe cactus.
We do observe a lot of alien cacti growing in the wild in this nation, including different prickly pear species like Opuntia ficus-indica and Opuntia monacantha. Many of these cacti have developed into unruly weeds. Except for the spineless horticultural variants, both of these plants are categorized as invaders, according to Richard Boon’s book Pooley’s Trees of Eastern South Africa. It’s great to hear that non-invasive versions have been created because they are incredibly valuable plants. Their delicious fruit is used to create a variety of goods, including jams and alcoholic beverages.
They are also utilized as hedging and as feed. Richard claims that the cochineal insects that consume Opuntia species are the ones that produce the cochineal or carmine dye that is used to color food, cosmetics, and clothing.
The good news is that utilizing biocontrol chemicals to stop the spread of invasive prickly pear species has worked well for conservationists.
The invasive Cereus jamacaru, often known as the “queen of the night,” is a beautiful plant with big white blooms that bloom at night and has been added to South Africa’s list of undesirable plants. It should not be grown because it has unfortunately become invasive.
Some of the Euphorbia family members, such as the Euphorbia ingens, also referred to as the naboom, are endemic to South Africa and resemble cactuses the most.
They are widely dispersed in the northern savannahs, according to Gideon F. Smith and Neil R. Crouch’s “Guide to Succulents of Southern Africa.” Euphorbia tetragona, sometimes known as honey euphorbia, is another common and attractive member of this species. This species can be found in the KwaZulu-Natal and Eastern Cape valleys, where it develops into a strong tree similar to the naboom. Not every euphorbia grows to be a size of a giant cactus. Euphorbia pulvina, which hugs the ground, resembles an overgrown pincushion. The dwarf succulent Euphorbia Woodii is described as having a “Medusa-like head growing prostrate on the soil surface” in the succulent guide.
Our larger, tree-like aloes make excellent cactus substitutes. The beautiful Bulbine, Gasteria, and Haworthia species, among other eye-catching relatives, are highly prized by enthusiasts of succulent plants.
There are numerous additional succulent families in southern Africa, the majority of which make excellent, water-wise, intriguing, and attractive garden topics. Of course, the Baobab (Adonsonia digitata), which can develop into a vast, enormous-girthed tree, is our largest succulent native to southern Africa.
The writers of the succulent guide note that plants like succulents that must endure times of intense stress typically are rich in compounds that frequently have medical uses. People in southern Africa have traditionally used succulents as a form of medicine.
They can be used for a variety of other things. Some are sold as traditional medicines, some are utilized as food, and some serve as a source of fiber for weaving and making ropes. The two writers argue that succulents are becoming more and more important in the effort to provide enough food for our expanding southern African population as well as sustainable plant material for use in traditional medical treatments.
Do cactus grow in Egypt?
Thus, cactus are not visible in Egypt. If so, they were likely brought in by men and preserved in pots. Except for the Rhipsalis Baccifera, which grows in subtropical parts of Africa, there are no native cacti to Egypt. Additionally, this cactus species can also be found in the Americas. Therefore, it is disputed if they are indigenous to Egypt alone.
Do you want to know more about the survival and growth of cacti? Read this article to learn how a cactus may thrive in the desert.
Do cacti grow in Australia?
Australia doesn’t have any native cactus. Cacti are native to the Americas, and many kinds are dangerous to Queensland’s ecology, agriculture, society, and public health. Invasive cactus species, such as the iconic prickly pear, have spread far throughout Queensland.
Are only deserts home to cacti?
One of the most well-known plant families in the world is the cactus family. Each year, thousands of visitors visit the desert to see these uncommon plants’ stunning blooms, thick stems, and unique shapes. As a plant family, cacti exhibit differences among their various species. They can be as small as a three-inch fishhook cactus hiding in a rock crevice or as tall as the saguaro cactus, which can grow to be 30 to 40 feet tall. In the desert, cacti can be found growing on rocky hillsides, alluvial fans, and in arid washes.
Natural History
American plants belonging to the cactus family are not native to Australia, Europe, or Africa. Only two cactus fossils have ever been discovered, therefore very little is known about early cactus plants. The oldest was discovered in Utah and dates back 50 million years. It resembled the prickly pear of today.
Up until around 65 million years ago, when the climate in much of California changed from year-round rainfall to a pattern of rainy summers and dry winters, cactus plants most likely thrived in a tropical environment. The cactus later adapted to the arid, desert conditions when the desert developed as a result of the Sierra Nevada and Peninsular Ranges rising and obstructing rainfall to the eastern valleys.
Cactus are often associated with desert areas, but they can also be found in some unexpected locales. Tall columnar cacti can be found growing among large-leaved trees and hanging vines in the lush, tropical regions of Mexico, South America, and several Caribbean Islands. In the Sierra Nevadas, one species can be seen growing at an elevation of 11,000 feet.
Adaptations to the Desert
The structural modifications of cactus are responsible for their survival in the desert. While similar characteristics like spines and succulent stems may also be found in other desert plants, these evolutionary traits are at their peak in the cactus.
Because their roots are close to the soil’s surface, cacti benefit from the lightest rainfall. The roots swiftly gather the water, which is then stored in sturdy, expanding stems for the protracted summer drought. The barrel cactus’ fleshy stems have accordion-like pleats and contract as moisture is lost. When it rains, these pleats also direct water to the plant’s base.
Many desert plants lose their leaves and go dormant in the summer when water isn’t available. Because they lack leaves and have fixed spines in their structure, cacti continue to photosynthesize. The plant’s nourishment is produced by the green stems, which also lose less water than leaves due to their sunken pores and waxy surface coating. During the day, the pores close, and at night, they open to let some moisture out.
The stems are kept colder than the surrounding air by the extensive network of spines that covers them. Many barrel cacti lean to the south so that the drying effects of the midday sun are minimized on the body surface. Slow growth is the price that cacti pay for these water-saving strategies. In the barrel cactus, growth can be as slow as 1/4 inch each year, and the majority of immature sprouts never mature.
Uses of Cactus
Cactus are a significant source of food and water for many animals, including the bighorn sheep and the antelope ground squirrel. The buckhorn cholla is frequently used as a nesting site by the California thrasher and cactus wren. These birds remove some of the cactus’ spines to make access easier for themselves, but they depend on the remaining spines to protect them from foxes, coyotes, and other predatory birds. The long arms of the saguaro cactus are home to burrows dug by Gila woodpeckers and golden flickers. The abandoned houses in the saguaros are also homes to owls, flycatchers, and starlings.
Native Americans have used many cactus species for thousands of years as food and medicine. During the cooler months, the Cahuilla Indians gathered desired plants. For its deliciousness, they gathered the beavertail cactus’ fruit. Large seeds from the fruit were mashed into a mush after it was cooked for at least 12 hours in a pit with hot stones. When the flesh pads were still young, they were boiled, chopped up, and used as greens.
To avoid getting hurt by the cactus’ harsh spines, native women harvested its buds with gathering sticks. Before being consumed, these buds were typically multiple times parboiled to reduce the bitter taste.
The Cahuilla employed the buckhorn cholla for medical purposes. To speed up the healing process, the stems were burned, and the ashes were applied to injuries and burns.
Where To See Cactus
Cactus are widespread in desert areas and typically bloom from late March to May. The blooms come in a variety of hues, from the rich magenta of the hedgehog cactus to the cream-colored saguaro petals, and from the bright yellow of the prickly pear to the pink of the beavertail cactus.