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-{{dablink|This article is about the plant family. For the former genus ''Cactus'', see [[Mammillaria]], [[Melocactus]], and [[Opuntia]]. For other meanings, see [[Cactus (disambiguation)]]}}
-{{redirect|Cacti|the software|Cacti (software)}}
-{{Taxobox
-| fossil_range = {{fossil range|35-0}}Late [[Paleogene]] - Recent
-| name = Cacti
-| image = Ferocactus1.jpg
-| image_width = 250px
-| image_caption = ''[[Ferocactus|Ferocactus pilosus]]'' (Mexican Lime Cactus) growing south of [[Saltillo]], [[Coahuila]], northeast [[Mexico]]
-| regnum = [[Plant]]ae
-| divisio = [[Flowering plant|Magnoliophyta]]
-| classis = [[Dicotyledon|Magnoliopsida]]
-| ordo = [[Caryophyllales]]
-| familia = '''Cactaceae'''
-| familia_authority = [[Antoine Laurent de Jussieu|Juss.]]
-| subdivision_ranks = [[Family (biology)|Subfamilies]]
-| subdivision =
-*[[Cactoideae]]
-*[[Maihuenioideae]]
-*[[Opuntioideae]]
-*[[Pereskioideae]]
-See also [[taxonomy of the Cactaceae]]
-}}
-A '''cactus''' is  (plural: ''cacti'' or ''cactuses'') a member of the [[plant]] family '''Cactaceae''', native to the [[Americas]] (with one exception, ''[[Rhipsalis baccifera]]'', which is native to parts of the [[Old World]]). They are often used as [[ornamental plant]]s, and some are also [[Crop (agriculture)|crop]] plants for fodder, forage, fruits, [[cochineal]], and other uses. Numerous species have been used since ancient times by indigenous peoples for their [[psychedelic]] effects. Cactuses are part of the plant order [[Caryophyllales]], which also includes members like [[beet]]s, [[gypsophila]], [[spinach]], [[amaranth]], [[tumbleweed]]s, [[carnation]]s, [[rhubarb]], [[buckwheat]], [[plumbago]], [[bougainvillea]], [[chickweed]] and [[knotgrass]].
-Cacti are unusual and distinctive [[plant]]s, which are adapted to extremely [[arid]] and/or [[semi-arid]] hot [[environment (biophysical)|environment]]s, as well as tropical environments as [[Epiphyte|epiphytes]] or [[Hemiepiphyte|hemi-epiphytes]] <ref>P.S. Nobel. 1988. Environmental Biology of Agaves and Cacti. [[Cambridge University]] Press, [[New York]].</ref><ref>P.S. Nobel. 1994. Remarkable Agaves and Cacti. [[Oxford University]] Press, New York. 166 pp. Spanish Translation by E. García Moya. 1998. Los Incomparables Agaves y Cactos. Editorial Trillas, Mexico City.</ref><ref>P.S. Nobel. 2010. DESERT WISDOM/AGAVES and CACTI: CO2, Water, Climate Change. iUniverse, Bloomington, IN. </ref>. They show a wide range of [[Anatomy|anatomical]] and [[Physiology|physiological]] features which conserve water. Their stems have adapted to become [[photosynthetic]] and [[succulent]], while the leaves have become the spines for which cacti are well known.
-Cacti come in a wide range of shapes and sizes. The tallest is ''[[Pachycereus pringlei]]'', with a maximum recorded height of 19.2 m,<ref>Salak, M. (2000). In search of the tallest cactus. ''Cactus and Succulent Journal'' 72 (3).</ref> and the smallest is ''[[Blossfeldia liliputiana]]'', only about 1&nbsp;cm diameter at maturity.<ref>[http://www.sbs.utexas.edu/mauseth/ResearchOnCacti/large%20photo%20Blossfeld%20liliput%20plants.htm Mauseth Cactus research: ''Blossfeldia liliputiana'']</ref> Cactus [[flower]]s are large, and like the spines and branches arise from [[areole]]s.
-[[Image:Cactus flower closeup03.jpg|thumb|left|Closeup image of a cactus flower (''[[Echinopsis spachiana]]'') showing large number of stamens.]]
-[[File:Echinopsis_perianth.jpg|thumb|left|Closeup look of a cactus perianth.]]
-Cacti are perennial and grow as trees, shrubs, or vines. Most species are terrestrial, but there are also many [[epiphytic]] species, especially in the tribes [[Rhipsalideae]] and [[Hylocereeae]]. In most species, except for the sub-family [[Pereskioideae]] (see image), the leaves are greatly or entirely reduced. The leaves may also be tiny and [[deciduous]] as can be seen on new shoots of ''[[Opuntia]]''. Spines found in the cacti are actually modified leaves; the stems (the green "pads" of many cacti) have also evolved to photosynthesize. The flowers, mostly radially symmetrical and bisexual, bloom either by day or by night, depending on the species. Their shape varies from tube-like through bell-like to wheel-shaped, and their size from 0.2 to 15–30 centimetres. Most of them have numerous [[sepal]]s (from 5 to 50 or more), and change form from outside to inside, from [[bract]]s to [[petal]]s. They have [[stamen]]s in great numbers (from 50 to 1,500, rarely fewer). Nearly all species of cacti have a bitter mucilaginous sap contained within them. The berry-like fruits may contain few to many (3,000), seeds, which can be between 0.4 and 12&nbsp;mm long.<ref>http://www.efloras.org/florataxon.aspx?flora_id=1&taxon_id=10141 Description of the Family in the Flora of North America.</ref>
-The life of a cactus is seldom longer than 300 years{{Fact|date=April 2009}}, but may be as short as 25 years, (although these flower as early as their second year). The Saguaro cactus (''[[Carnegiea gigantea]]'') grows to a height of up to 15 metres (the record is 17 metres 67&nbsp;cm), but in its first ten years, it grows only 10 centimetres. The "mother-in-law's cushion" (''[[Echinocactus grusonii]]'') reaches a height of 2.5 metres and a diameter of 1 metre and – at least on the [[Canary Islands|Canaries]] – is already capable of flowering after 6 years. The diameter of cactus flowers ranges from 5 to 30&nbsp;cm; the colors are often conspicuous and spectacular.
-The cactus family is endemic to the [[Americas]] with one exception, ''[[Rhipsalis baccifera]]''; this species has a [[pantropical]] distribution, occurring in the [[Old World]] tropical [[Africa]], [[Madagascar]] and [[Sri Lanka]] as well as in tropical America.  This plant is thought to be a relatively recent colonist in the [[Old World]] (within the last few thousand years), probably carried as [[seed]]s in the [[digestive tract]]s of [[Bird migration|migratory]] [[bird]]s. Many other cacti have become naturalized to similar environments in other parts of the world after being introduced by people, e.g. [[Australia]], [[Hawaii]], and the [[Mediterranean region]]. The [[Tehuacán Valley matorral|Tehuacán Valley]] of [[Mexico]] has one of the richest occurrences of cacti in the world.<ref>{{cite web|url=http://www.parkswatch.org/parkprofiles/pdf/tcbr_eng.pdf|format=PDF|title=Mexico: Tehuacán-Cuicatlán Biosphere Reserve.}}</ref>  Species diversity decreases as one travels north; hundreds of species can be found in areas of Mexico, dozens of species are found in the [[Sonora desert|Sonora]] and [[Mojave desert]]s of the southwestern U.S., and only several species are found in the eastern plains and dry valleys of [[Montana]] and [[Alberta]].
-Cacti are believed to have evolved in the last 30 to 40 million years{{Fact|date=April 2009}}.  Long ago, the [[Pangaea|Americas were joined to the other continents]], but separated due to [[continental drift]]. Unique species in the New World must have developed after the continents had moved apart or began developing just prior to the separation. Significant distance between the continents was only achieved in around the last 50 million years. This may explain why cacti are so rare in Africa as the continents had already separated when cacti evolved. Many [[succulent plant]]s in both the Old and New World bear a striking resemblance to cacti, and are often called "cactus" in common usage.
-== Adaptations to dry environment ==
-Some environments, such as deserts, semi-deserts, and dry [[steppes]], receive little water in the form of [[Precipitation (meteorology)|precipitation]]. Plants that inhabit these dry areas are known as [[xerophytes]], and many of them are [[succulent]]s, with thick or reduced, "succulent", [[leaf|leaves]]. Apart from a few exceptions (for example, the genus [[Pereskia]]) all cacti are succulent plants. Like other [[succulents]], cacti have a range of specific adaptations that enable them to survive in these environments.
-[[Image:Pereskia grandifolia3.jpg|thumb|''Pereskia grandifolia'': ''[[Pereskia]]'' is a weakly succulent genus, which also possesses leaves, and is believed to be very similar to the ancestor of all cacti.]]
-[[Image:Barrelsonacliff.jpg|thumb| [[Barrel Cactus]] growing on a cliff in the [[Mojave Desert]]. These cacti can reach up to six feet tall in some cases.]]
-[[Image:Organ-pipe-cactus.jpg|thumb|left|[[Stenocereus thurberi|Organ Pipe cactus]] in Arizona]]
-[[Image:Cactus1web.jpg|thumb|left|Many species of cactus have long, sharp [[spine (botany)|spines]].]]
-Cacti have never lost their leaves completely{{Fact|date=April 2009}}; they have only reduced the size so that they reduce the surface area through which water can be lost by transpiration. In some species the leaves are still remarkably large and ordinary while in other species they have become microscopic but they still contain the [[stomata]], [[xylem]] and [[phloem]]. Certain cactus species have also developed ephemeral or [[deciduous]] leaves, which are leaves that last for a short period of time when the stem is still in its early stages of development. A good example is ''[[Opuntia ficus-indica]]'', better known as the prickly pear. Cacti have also developed [[spine (biology)|spines]] which allow less water to evaporate through [[transpiration]] by shading the plant, and defend the cactus against water-seeking animals. The spines grow from specialized structures called [[areole]]s, homologous to the nodes on other plants. Very few members of the family have leaves, and when present these are usually rudimentary and soon fall off; they are typically awl-shaped and only 1–3&nbsp;mm. long. Two genera, ''[[Pereskia]]'' and ''[[Pereskiopsis]]'', do however retain large, non-succulent leaves 5–25&nbsp;cm. long, and non-succulent stems. ''Pereskia'' has now been determined to be the ancestral genus from which all other cacti evolved.<ref>[http://www.eurekalert.org/pub_releases/2006-05/uocp-hdc051206.php How did cacti evolve?<!-- Bot generated title -->]</ref>
-Enlarged [[Plant stem|stems]] carry out [[photosynthesis]] and store water. Unlike many other succulents, the stem is the only part of a true cactus where this takes place.  Much like many other plants that have [[wax]]y coatings on their leaves, cacti often have a waxy coating on their stems to prevent water loss and potentially repel water from their stems.
-The bodies of many cacti have become thickened during the course of evolution, and form water-retentive tissue and in many cases assume the optimal shape of a sphere or cylinder (combining highest possible volume with lowest possible surface area). By reducing its surface area, the body of the plant is also protected against excessive sunlight.
-[[Image:Cactus arizona2.jpg|thumb|right|[[Saguaro]] cactus in [[Arizona]], USA. This species is well known from [[Western (genre)|Western films]].]]
-[[Image:Cacti barrel.JPG|thumb|right| A fishhook barrel cactus in [[Arizona]], USA.]]
-Most cacti have a short [[growing season]] and long dormancy. For example, a fully-grown Saguaro cactus ''([[Carnegiea gigantea]])'' can absorb up to 3,000 litres of water in ten days. This is helped by the ability to form new roots quickly. Two hours after rain following a relatively long drought, root formation begins in response to the moisture. Apart from a few exceptions, an extensively [[ramification (botany)|ramified]] root system is formed, which spreads out immediately beneath the surface. The salt concentration in the root cells is relatively high{{Fact|date=April 2009}}, so that when moisture is encountered, water can immediately be absorbed in the greatest possible quantity.
-But the plant body itself is also capable of absorbing moisture (through the epidermis and the thorns), which for plants that are exposed to moisture almost entirely or indeed in some cases solely, in the form of fog, is of the greatest importance for sustaining life.
-Most cacti have very shallow roots that can spread out widely close to the surface of the ground to collect water, an adaptation to infrequent rains; in one examination, a young [[Saguaro]] only 12&nbsp;cm. tall had a root system covering an area 2 meters in diameter, but with no roots more than 10&nbsp;cm. deep.<ref name="dalhousie">[http://cactus.biology.dal.ca/biology.html Dalhousie University: Biology of Cacti]</ref> The larger columnar cacti also develop a [[taproot]], primarily for anchoring but also to reach deeper water supplies and mineral nutrients.<ref name="dalhousie"/>
-One feature distinguishes the cacti from all other plants: cacti possess ''[[areole]]s'', as they are known. The areole appears like a cushion with a diameter of up to 15&nbsp;mm. and is formed by two opposing buds in the angles of a leaf{{Fact|date=April 2009}}. From the upper bud develops either a blossom or a side shoot, from the lower bud develop thorns. The two buds of the areoles can lie very close together, but they can also sometimes be separated by several centimeters.
-Like other succulents in the families of the [[Crassulaceae]], [[Agavaceae]] (agaves), [[Euphorbiaceae]] (euphorbias), [[Liliaceae]] (lilies), [[Orchidaceae]] (orchids) and [[Vitaceae]] (vines), cacti reduce water loss through transpiration by [[Crassulacean acid metabolism]].<ref name="dalhousie"/> Here, transpiration does not take place during the day at the same time as [[photosynthesis]], but at night. The plant stores the [[carbon dioxide]] chemically linked to [[malic acid]] until the daytime. During the day the [[stoma]]ta are closed and the plant releases the stored CO<sub>2</sub> and uses it for photosynthesis. Because transpiration takes place during the cool humid night hours, water loss through transpiration is significantly reduced.
-==Reproductive ecology==
-[[Image:Echinopsis - Blüte von der Seite.jpg|thumb|left|Blooming ''[[Echinopsis]]''. The sweet-smelling flower opens towards evening and dies the following morning.]]
-Some cactus flowers form long tubes (up to 30 centimetres) so that only moths can reach the nectar and therefore pollinate the blossoms. There are also specializations for [[bat]]s, [[hummingbird]]s and particular species of [[bee]]s. The duration of flowering is very variable. Many flowers, for example those of ''[[Selenicereus grandiflorus]]'' (''Queen of the Night'') are only fully open for two hours at night. Other cacti flower for a whole week. Most cacti are [[Self-incompatibility in plants|self-incompatible]], and thus require a pollinator. A few are [[Reproduction#Autogamy|autogamous]] and are able to pollinate themselves. [[Frailea]]s only open their flowers completely in exceptional circumstances; they mostly pollinate themselves or others with their flowers closed ("cleistogamy"). The flower itself has also undergone a further development: the [[ovary (plants)|ovary]] tends to become a completely protected area, protected by thorns, hairs and scales. Seed formation is very prolific, and the fruits are mostly fleshy, pleasant tasting and conspicuously coloured. Goats, birds, ants, mice and bats contribute significantly to the spreading of the seeds.
-Because of the plants' high water-retention ability, detached parts of the plant can survive for long periods and are able to grow new roots anywhere on the plant body.
-<!--  -->==History==
-[[Image:Carl Spitzweg 027.jpg|thumb|175px|[[Carl Spitzweg]]: The Cactus Lover, c. 1856]]
-[[Image:Cactuslarcomuseum.jpg|thumb|right|175px|Moche Cactus. 200 B.C. [[Larco Museum|Larco Museum Collection]] Lima, Peru.]]
-Among the remains of the [[Aztec]] civilization, cactus-like plants can be found in pictorial representations, sculpture and drawings, with many depictions resembling ''[[Echinocactus grusonii]]''. [[Tenochtitlan]] (the earlier name of [[Mexico City]]) means "place of the sacred cactus." The [[coat of arms of Mexico]] to this day shows an eagle perched on a cactus while holding a snake, an image which is at the center of the Aztec origin myth.<ref>http://aztecs.mrdonn.org/place.html</ref>
-Economic exploitation of the cactus can also be traced back to the Aztecs. The [[North American Indian]]s utilize the [[alkaloid]] content of several cacti species for religious ceremonies. Today, besides their use as foodstuffs (jam, fruit, vegetables), their principal use is as a host for the [[cochineal]] insect, from which a red dye ([[carmine]]) is obtained which is used in [[Campari]] or high-quality [[lipstick]]s. Particularly in [[South America]] dead pillar cacti yield valuable wood for construction. Some cacti are also of pharmaceutical significance.
-From the moment the early European explorers sighted them, cacti have aroused much interest: [[Christopher Columbus]] brought the first [[melocactus]] to Europe. Scientific interest in them began in the 17th century. By 1737, twenty-four species were known, which [[Linnaeus]] grouped together as the genus "Cactaceae".
-From the beginning of the 20th century, interest in cacti has increased steadily. This was accompanied by a rising commercial interest, the negative consequences of which culminated in raids on their native habitats. Through the great number of cactus admirers, whether their interest is scientific or hobby-oriented, new species and varieties are even today discovered every year.
-All cacti are covered by the [[Convention on International Trade in Endangered Species of Wild Fauna and Flora]], and many species by virtue of their inclusion in Appendix 1 are fully protected.
-Some countries have a rather contradictory attitude to species protection. In Mexico for example to be caught in the act of digging up cacti carries a prison sentence, but cactus habitats are destroyed for the construction of new roads and electricity lines.
-The [[Moche]] people of ancient [[Peru]] worshipped agriculture and often depicted the cactus in their art <ref>Berrin, Katherine & Larco Museum. ''The Spirit of Ancient Peru:Treasures from the [[Larco Museum|Museo Arqueológico Rafael Larco Herrera]].'' New York: [[Thames and Hudson]], 1997.</ref>.
-== Uses ==
-Cacti, cultivated by people worldwide, are a familiar sight as potted plants, [[houseplant]]s or in ornamental gardens in warmer climates. They often form part of [[xeriscaping|xeriphytic (dry) gardens]] in arid regions, or raised rockeries. Some countries, such as Australia, have water restrictions in many cities, so drought-resistant plants are increasing in popularity. Numerous species have entered widespread cultivation, including members of ''[[Echinopsis]]'', ''[[Mammillaria]]'' and ''[[Cereus]]'' among others. Some, such as the Golden Barrel dekha Cactus, ''[[Echinocactus grusonii]]'', are prominent in garden design.
-Cacti are commonly used for fencing material where there is a lack of either natural resources or financial means to construct a permanent fence. This is often seen in [[arid]] and warm climates, such as the [[Masai Mara]] in Kenya. This is known as a [[cactus fence]]. Cactus fences are often used by homeowners and [[landscape architect]]s for [[home security]] purposes. The sharp thorns of the cactus deter unauthorized persons from entering private properties, and may prevent break-ins if planted under windows and near drainpipes. The aesthetic characteristics of some species, in conjunction with their home security qualities, makes them a considerable alternative to artificial [[fence]]s and [[wall]]s.
-[[Image:Nopal11.jpg|thumb|right|120px|A Mexican dish, [[nopal]] salad.]]
-As well as garden plants, many cactus species have important commercial uses, some cacti bear edible [[fruit]], such as the [[opuntia|prickly pear]] and ''[[Hylocereus]]'', which produces [[Dragon fruit]] or [[Pitaya]]. According to [[Reuters]], the edible cactus, or [[nopal]], industry in Mexico is worth $150 million each year and approximately 10,000 farmers cultivate the plant.<ref>http://www.reuters.com/article/oddlyEnoughNews/idUSN2G28324120070219</ref> ''[[Opuntia]]'' are also used as host plants for cochineal bugs in the [[cochineal]] dye industry in [[Central America]].
-The [[Peyote]], ''Lophophora williamsii'', is a well-known psychoactive agent used by Native Americans in the Southwest of the [[United States of America]]. Some species of ''[[Echinopsis]]'' (previously ''[[Trichocereus]]'') also have psychoactive properties. For example, the San Pedro cactus, a common specimen found in many garden centers, is known to contain [[mescaline]].
-==Etymology==
-[[Image:Pricklypearcrop.jpg|thumb|right| [[Opuntia|Prickly Pear]] is among the most common type of cactus found in North America]]
-The word ''cactus'' is derived through Latin from the [[Ancient Greek|Greek]] κάκτος ''kaktos'', which referred to the [[cardoon]] (''Cynara cardunculus''). [[Carolus Linnaeus|Linnaeus]] in 1753 applied this name generically to a genus he called ''Cactus'', which was later reassigned as a family, ''Cactaceae'', and subdivided into multiple genera.<ref>''Oxford English Dictionary'', s.v. "cactus", http://dictionary.oed.com/cgi/entry/50030958.</ref> ''Cactuses'', the Latin plural ''cacti'', and the uninflected plural ''cactus'' are all used in English.<ref>''Merriam-Webster's Online Dictionary'', s.v. "cactus", http://www.merriam-webster.com/dictionary/cactus.</ref>
-==See also==
-* [[Ariocarpus scaphirostris]]
-==References==
-{{Reflist}}
-==External links==
-[[File:Chollainbloom.jpg|thumb|200px|[[Cylindropuntia|Cholla]] cactus in bloom at night in the [[Mojave Desert]].]]
-* [http://www.cssainc.org/ Cactus and Succulent Society of America]
-* [http://www.cactusedintorni.com/en/ Cacti & Succulent photo gallery, cultivation tips and big plant database (in 4 languages)]
-* [http://www.floridanaturepictures.com/cacti/cacti.html Cacti & Succulent Picture Gallery]
-* [http://www.aztekium.narod.ru/cacti/photos/index.htm Cacti Picture Gallery]
-* [http://www.spbcactus.narod.ru/ Cacti Picture Gallery of Saint-Petersburg Cactus Club]
-* [http://www.cactiguide.com/ CactiGuide - many photos, and discussion forum]
-* [http://cactus-guide.com A Guide to the Miraculous Cactus World]
-* [http://www.intermountaincactus.com Intermountain Cactus: Winter Hardy Cactus]
-* [http://www.blackturtle.us/DV_PLANTS/cactus.html Cactus of the Death Valley Area]
-* [http://www.succulentcity.org/ SucculentCity - Plant Profiles, Photographs & Cultivation Data]
-* [http://www.suculentas.es/Taxonomia.php?Nodo=18 Suculentas.es - Spanish language website with many photographs]
-* [http://www.chileflora.com/Florachilena/FloraEnglish/PIC_FAMILIES_SIMPLE_30.php Chilean Cacti, by Chileflora]
-* [http://ralph.cs.cf.ac.uk/Cacti/fieldno.html Cactus and Succulent Field Number Database]
-* [http://www.kaktusai.visiems.lt/ Lithuanian catus photo gallery]
-* [http://www.agoracactus.com.ar/ www.agoracactus.com.ar - Cacti & Succulent Forum from Argentine]
-* [http://www.panda.org/what_we_do/endangered_species/cacti/ WWF priority species profile for cacti]
-{{commonscat|Cactaceae}}
-[[Category:Cacti]]
-[[Category:Caryophyllales families]]
-[[ar:صبار]]
-[[ay:Achakaña]]
-[[az:Kaktus]]
-[[bn:ক্যাক্‌টাস]]
-[[zh-min-nan:Sian-jîn-chióng]]
-[[bo:ཀླུ་ཥིང་]]
-[[bg:Кактусови]]
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-[[cs:Kaktusovité]]
-[[da:Kaktus-familien]]
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-[[es:Cactaceae]]
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-[[gl:Cacto]]
-[[ko:선인장]]
-[[hsb:Kaktusowe rostliny]]
-[[hr:Kaktusi]]
-[[io:Kaktuso]]
-[[id:Kaktus]]
-[[is:Kaktusar]]
-[[it:Cactaceae]]
-[[he:צבריים]]
-[[ka:კაქტუსისებრნი]]
-[[ht:Cactus]]
-[[lt:Kaktusiniai]]
-[[hu:Kaktuszfélék]]
-[[mr:निवडुंग]]
-[[nl:Cactusfamilie]]
-[[ja:サボテン]]
-[[no:Kaktusfamilien]]
-[[nn:Kaktus]]
-[[pl:Kaktusowate]]
-[[pt:Cactaceae]]
-[[ro:Cactaceae]]
-[[qu:Waraqu yura rikch'aq ayllu]]
-[[ru:Кактусовые]]
-[[simple:Cactus]]
-[[sl:Kaktusi]]
-[[sr:Кактус]]
-[[fi:Kaktuskasvit]]
-[[sv:Kaktusväxter]]
-[[tl:Kakto]]
-[[te:కాక్టేసి]]
-[[th:กระบองเพชร]]
-[[tg:Кактус]]
-[[tr:Kaktüsgiller]]
-[[uk:Кактусові]]
-[[vi:Họ Xương rồng]]
-[[yi:קאקטוס]]
-[[zh:仙人掌]]