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Cenchrus
Cenchrus longispinus line drawing[4]
Cenchrus echinatus burr
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Poales
Family: Poaceae
Subfamily: Panicoideae
Supertribe: Panicodae
Tribe: Paniceae
Subtribe: Cenchrinae
Genus: Cenchrus
L. (1753)[1]
Type species
Cenchrus echinatus[2][3]
Synonyms[5]
  • Amphochaeta Andersson (1855)
  • Beckeropsis Fig. & De Not. (1853)
  • Catatherophora Steud. (1829)
  • Cenchropsis Nash (1903)
  • Echinaria Fabr. (1759), rejected name not Desf. 1799
  • Eriochaeta Fig. & De Not. (1853)
  • Gymnotrix P.Beauv. (1812)
  • Kikuyuochloa H.Scholz (2006)
  • Lloydia Delile (1844), nom. illeg.
  • Odontelytrum Hack. (1898)
  • Penicillaria Willd. (1809)
  • Pennisetum Rich. (1805)
  • Pseudochaetochloa Hitchc. (1924)
  • Raram Adans. (1763)
  • Runcina Allamand (1770)
  • Sericura Hassk. (1842)

Cenchrus is a widespread genus of plants in the grass family, native to tropical and warm temperate regions of the world.[3][6] Its species are native to many countries in Asia, Africa, Australia, the Americas, and various oceanic islands.[7][8]

Common names include buffelgrasses, sandburs, and sand spur. Such names allude to the sharp, spine-covered burrs characterizing the inflorescences of the members of the genus.[9] Those previously classified as Pennisetum /ˌpɛnɪˈsiːtəm/[10] are known commonly as fountaingrasses (fountain grasses).[11][12][13][14]

Taxonomy

[edit]

Pennisetum

[edit]

Pennisetum is a former genus that heavily overlaps with Cenchrus,[15] and the boundary between them has been unclear.[16] Cenchrus was derived from Pennisetum and the two are grouped in a monophyletic clade.[17] A main morphological character that has been used to distinguish them is the degree of fusion of the bristles in the inflorescence, but this is often unreliable. In 2010, researchers proposed to transfer Pennisetum into Cenchrus, along with the related genus Odontelytrum.[18] The genus is currently not accepted as separate from Cenchrus in Kew's Plants of the World Online database.[5]

Distribution

[edit]

The various species are native to Africa, Asia, Australia, and Latin America, with some of them widely naturalized in Europe and North America, as well as on various oceanic islands.[19]

Description

[edit]

They are annual or perennial grasses. Some are petite while others can produce stems up to 8 meters tall.[16] The inflorescence is a very dense, narrow panicle containing fascicles of spikelets interspersed with bristles. There are three kinds of bristle, and some species have all three, while others do not. Some bristles are coated in hairs, sometimes long, showy, plumelike hairs that inspired the genus name, the Latin penna ("feather") and seta ("bristle").[16]

Uses

[edit]

The genus includes pearl millet (P. glaucum), an important food crop. Napier grass (P. purpureum) is used for grazing livestock in Africa.

Several species are cultivated as ornamental plants, notably P. advena, P. alopecuroides, P. orientale, P. setaceum, and P. villosum. The cultivar 'Fairy Tails' is a recipient of the Royal Horticultural Society's Award of Garden Merit.[20][21]

Ecology

[edit]
Invasive Cenchrus setaceus growing on a lava flow in Hawaii

Many Pennisetum grasses are noxious weeds, including feathertop grass (P. villosum) and kikuyu grass (P. clandestinum), which is also a popular and hardy turf grass in some parts of the world.

The herbage and seeds of these grasses are food for herbivores, such as the chestnut-breasted mannikin (Lonchura castaneothorax), the caterpillar of the butterfly Melanitis phedima, and the larvae of the fly genus Delia.

The genus is a host of the pathogenic fungus Cochliobolus sativus.

Species

[edit]
Cenchrus alopecuroides
Cenchrus hohenackeri
Cenchrus orientalis
Cenchrus pedicellatus
Cenchrus alopecuroides

107 species are currently accepted.[5] They include:[22][23][24][25]

Formerly included[22]

Several species are now considered better suited to other genera: Anthephora, Centotheca, Dactyloctenium, Echinaria, Echinolaena, Hackelochloa, Hilaria, Pennisetum, Phragmites, Scleria, Setaria, Trachys, Tragus, Tribolium.

  • Sand spur in front of a centimeter scale
    Sand spur in front of a centimeter scale
  • Sandspurs with 1mm markings
    Sandspurs with 1mm markings

See also

[edit]

References

[edit]

Further reading

[edit]
[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Cenchrus

View on Grokipedia
from Grokipedia
Cenchrus is a of monocotyledonous flowering plants in the grass family , encompassing approximately 108 accepted species of annual and perennial herbs primarily distributed in tropical and subtropical regions of the and the . These grasses are characterized by their cylindrical, spike-like panicles that bear clusters of one to several spikelets, each subtended by an involucre of bristles or spines that aid in and protection. The taxonomy of Cenchrus has undergone significant revision, particularly with the phylogenetic study that unified it with the closely related genera Pennisetum and Odontelytrum based on combined nuclear, , and morphological analyses, establishing Cenchrus (which has nomenclatural priority) as the accepted name for the monophyletic group. This merger expanded the genus to include former Pennisetum species, such as pearl millet (C. americanus), reflecting shared evolutionary traits like the fasciculate inflorescences and adaptation to arid environments. Species vary in habit, from low-growing annuals like sandburs (C. echinatus) to tall perennials reaching up to 8 meters, often thriving in sandy, well-drained soils of open or disturbed habitats. Ecologically and economically, Cenchrus species play diverse roles: several are cultivated as staple crops, notably pearl millet for grain in semi-arid and ; others serve as important grasses, such as buffelgrass (C. ciliaris), widely used for but notorious as an that alters fire regimes and threatens in regions like and the . Ornamental fountain grasses (C. setaceus and C. alopecuroides) are popular in for their plume-like inflorescences, while weedy members like southern sandbur (C. echinatus) pose challenges to due to their spiny burs that injure animals and contaminate crops. Overall, the genus exemplifies the adaptability of to warm climates, with ongoing research addressing its phylogenetic relationships and management as both beneficial and problematic plants.

Taxonomy

Etymology and History

The genus name Cenchrus derives from the word kenchros, referring to a type of millet and evoking the tail-like inflorescences of its species that resemble millet heads. This etymological choice was made by , who established the to classify grasses with distinctive burr-like structures. Linnaeus formally described Cenchrus in the second volume of Species Plantarum (1753), placing it within the Poaceae family and defining it based on key floral characteristics such as involucrate spikelets. He included two original species under the genus, with Cenchrus echinatus later designated as the lectotype species, serving as the nomenclatural benchmark for the genus. In its early circumscription, Cenchrus was limited to approximately 20–25 species, primarily taxa distinguished by their spiny burrs that enclose the spikelets, reflecting Linnaeus's focus on these painful, adhesive fruits as a diagnostic trait. This narrow definition persisted through much of the 18th and 19th centuries until broader taxonomic revisions, including a merger with the related Pennisetum, expanded its scope.

Synonymy and Phylogenetic Relationships

The genus Cenchrus L. has several historical synonyms, including Pennisetum Rich. (1808), which was long recognized as a distinct encompassing many species now placed in Cenchrus, and Amphochaeta Andersson (1855), a smaller segregate based on morphology. Other synonyms include Odontelytrum Hack. (1898) and Beckeropsis Fig. & De Not. (1854), reflecting early taxonomic fragmentation within the -bearing grasses of . A major taxonomic revision occurred in 2010, when phylogenetic analyses supported the merger of Pennisetum (approximately 80–140 species), (20–25 species), and Odontelytrum (one species) into a single genus under the name , which has nomenclatural priority. This unification was based on a combined of morphological traits—particularly fusion and structure, length, and lemma features—and molecular data from the nuclear (kn1) gene and plastid regions trnL-F and ndhF, which resolved the genera as a monophyletic PCO clade within the grasses. The study made 66 new nomenclatural combinations in to accommodate the transferred , addressing the polyphyly of Pennisetum and continuous variation in traditional diagnostic characters like fusion. As of 2025, comprises 108 accepted according to . Phylogenetically, Cenchrus is placed in subtribe Cenchrinae of tribe Paniceae (subfamily Panicoideae, Poaceae), a monophyletic group characterized by sterile branchlets (bristles) subtending spikelets. Within Cenchrinae, Cenchrus forms a well-supported clade sister to Setaria (including Paspalidium), based on expanded plastid and nuclear analyses that confirm their close relationship in the "bristle clade." All species in Cenchrus and subtribe Cenchrinae utilize the C4 photosynthetic pathway, specifically the NADP-ME subtype, as confirmed by leaf anatomy featuring Kranz-type bundle sheath cells with centripetal chloroplasts and suberized lamellae.

Description

Vegetative Morphology

Cenchrus species exhibit a range of growth habits, including tufted annuals and rhizomatous perennials that form tussocks, mats, or spreading clumps. The culms, or stems, are typically erect or ascending, often robust and tillering, with heights varying from 0.1 to 8 meters depending on the species and environmental conditions; for instance, annual species may reach 10-95 cm, while robust perennials like C. purpureus can reach up to 7-8 m. These culms are terete and solid, featuring a large central pith area that contributes to structural support in arid habitats. The leaves of Cenchrus are alternate and two-ranked, consisting of flat or folded that are linear to lanceolate, measuring 5-50 cm in length and 2-15 mm in width, with surfaces that are glabrous, pubescent, or scabrous and often featuring a prominent midrib. sheaths are striate, tubular, and embracing, typically glabrous but frequently hairy at the , providing to the culm nodes. Ligules are membranous or a fringe of hairs, 0.5-3 mm long, marking the junction between the sheath and . The systems in Cenchrus are predominantly fibrous and extensive, particularly in species, enabling deep penetration up to 2 m for enhanced and soil anchoring. Some , such as C. caudatus, produce short rhizomes up to 2 m long that facilitate clonal spread and vegetative . This architecture supports the genus's adaptation to sandy or disturbed soils in tropical and subtropical regions.

Reproductive Morphology

The inflorescences of Cenchrus species consist of dense, cylindrical to subglobose spike-like panicles that measure 2–45 cm in length and are typically terminal on the culms. These panicles feature fascicles of 1–20 spikelets, each cluster subtended by an involucre of 10–200 bristles ranging from 0.5–4 cm long, which are often basally fused into a cupule or disk and may be terete, flattened, or spinose. The bristles are along with the spikelets, forming prickly glomerules or burrs that enhance structural integrity and dispersal potential. Spikelets within each fascicle are to lanceolate, 2–8 mm long, and dorsally compressed, comprising one basal sterile floret and one fertile bisexual floret without rhachilla extension. The are unequal, with the lower glume reaching 1/4–1/2 the length of the upper glume; the lemmas are membranous with 3–7 veins, and the palea matches the lemma in texture and approximate length. The fruits are caryopses, elliptic to ovoid and 1.5–4 mm long, with a dorsally compressed form and adherent pericarp. In such as C. echinatus and C. longispinus, the caryopses remain enclosed in burr-like structures formed by the spinose involucral bristles, which attach to animal or to promote epizoochory. These adaptations ensure the entire fascicle disarticulates and disperses as a unit.

Distribution and Habitat

Native Range

The genus Cenchrus exhibits a pantropical native distribution, with species originating primarily across , , and the , reflecting its adaptation to diverse warm-climate ecosystems. The primary center of diversity is located in tropical , with significant presence in the . Approximately 80 of the 108 accepted species are native to , while about 20 are native to the . For instance, (C. americanus), an ancestor domesticated in the , underscores 's role as a key origin point for several economically significant grasses. In , Cenchrus achieves its greatest , with a substantial portion native to the continent, including one endemic (C. pseudotriticoides) restricted to . The distribution extends to southern , including and the , as well as parts of , where a few are native. These patterns highlight Africa's dominance as a hotspot, with concentrations in and biomes across tropical and subtropical zones. In the , native Cenchrus species are centered in Central and , extending northward to the . Notable examples include C. echinatus, which ranges from through coastal regions to , often in sandy habitats. hosts around 10 native species, contributing to the genus's overall biogeographic emphasis on warm, arid to semi-arid environments linked to and formations.

Introduced Distributions

Species of the genus Cenchrus have been introduced beyond their native ranges primarily through activities associated with , forage production, and ornamental planting, beginning in the and accelerating in the early . Intentional introductions for and occurred widely from the 1920s to 1950s, while accidental dispersal via contaminated seeds in trade has facilitated further spread. These grasses have naturalized in diverse regions, often becoming invasive and posing management challenges due to their rapid establishment and competition with native . In , particularly the Mediterranean Basin, species such as C. setaceus have naturalized and are listed as invasive alien species of Union Concern by the , with recent records in (e.g., ) highlighting ongoing expansion on ruderal and coastal sites. C. ciliaris is established in , including , where it invades arid habitats. In , introductions to the date to the early 1900s, with C. ciliaris becoming highly invasive in Arizona's , covering extensive areas and requiring active control efforts in national parks. C. setaceus is invasive in , escaping from ornamental plantings to colonize grasslands, canyons, and roadsides. Oceania has seen significant introductions, with C. ciliaris (buffel grass) sown across tens of millions of hectares in , particularly in and the , where it invades eucalypt woodlands and alters landscapes on a massive scale, complicating management. In , both C. ciliaris and C. setaceus were introduced in the 1930s and 1914, respectively, and now dominate dry coastal and leeward , increasing fire risks and outcompeting natives; C. setaceus is especially problematic as an aggressive invader from ornamental origins. Additional oceanic islands, such as and Nihoa in the Pacific, have faced invasions by C. echinatus, prompting eradication programs to prevent degradation. In , C. setaceus is classified as a category one invasive, spreading in natural areas and requiring stringent control measures.

Ecology

Life History and Reproduction

Cenchrus species exhibit diverse life cycles adapted to their habitats, ranging from annual to perennial forms. Annual species, such as C. echinatus (southern sandbur), complete their life cycle within a single growing season, emerging in spring, flowering 7-13 weeks after germination, and producing seeds before senescence in late summer or fall. In contrast, perennial species like C. ciliaris (buffelgrass) are long-lived, with individual tussocks persisting 10-20 years, while C. purpureus (Napier grass) can live 3-10 years or more under favorable conditions. Perennials often propagate vegetatively through tillers or rhizomes, allowing clonal spread and persistence beyond seasonal constraints; for instance, C. ciliaris forms dense stands via rhizomatous growth and nodal tillering after defoliation. Reproduction in Cenchrus is primarily sexual via , though (asexual seed formation) is prevalent in many species, enabling self-compatible propagation without fertilization. Flowers are wind-pollinated, with inflorescences releasing lightweight for anemophilous dispersal, and self-compatibility facilitates reproduction in isolated populations. production is prolific in dense stands, reaching up to approximately 3,800 per square meter in C. ciliaris, with individual plants yielding 1,000-38,000 depending on and environment. is typically dormant for 6-12 months post-maturity, broken by after-ripening or environmental cues like ; viable require moisture (5-25 mm ) and temperatures above 10°C, with optimal rates (60-100%) at 25-35°C. The burr-like structures enclosing spikelets aid by adhering to surfaces, enhancing colonization potential. Environmental adaptations in Cenchrus center on C4 photosynthesis, which confers high efficiency in warm, high-light conditions by minimizing and optimizing CO₂ fixation under elevated temperatures up to 35°C. This pathway supports rapid growth in arid tropics, where species like C. ciliaris achieve superior water-use efficiency compared to C3 plants. is further enhanced by deep root systems—reaching 2.8 m in C. ciliaris—that access subsurface water, coupled with physiological reductions in via stomatal regulation and anatomical features like thickened and lignified tissues. These traits enable survival on as little as 50-100 mm annual , with minimal water loss during extended dry periods.

Ecological Role and Interactions

Cenchrus species often act as pioneer plants in disturbed sandy or arid environments, rapidly colonizing areas such as roadsides, overgrazed rangelands, and eroded soils where native vegetation is sparse. Their extensive root systems, which can penetrate up to 2 meters deep, contribute to soil stabilization by reducing erosion and improving water infiltration in these habitats. However, in invasive contexts, particularly with C. ciliaris (buffelgrass), these grasses form dense monocultures that outcompete native species for resources like water and nutrients, leading to decreased plant diversity and altered successional dynamics. This competitive edge is potentially due to allelopathic effects, as suggested by some studies, where root exudates and leaf leachates may inhibit the germination and growth of neighboring plants. Recent studies (as of 2024) indicate that Cenchrus-dominated grasslands in regions like Hawaiʻi exhibit resilience to mechanical disturbances, complicating control efforts. Biotic interactions involving Cenchrus are multifaceted, with the grasses serving as a food source for various herbivores while also influencing associated . Livestock and wild ungulates, such as deer and , graze on the foliage and seeds, which provide nutritious , especially in arid regions where alternatives are limited. Avian , including zebra finches (Taeniopygia guttata), consume the seeds, though they preferentially select native grass seeds when available, potentially reducing reliance on Cenchrus in mixed habitats. The genus hosts fungal pathogens, such as those causing blights, and insect pests like spittlebugs, which can affect plant health but rarely limit populations significantly. Seed dispersal primarily occurs via burr-like spikelets that adhere to animal fur, clothing, or machinery, with harvester ants (Pogonomyrmex spp.) occasionally transporting entire burrs to nests, aiding short-distance spread. is predominantly anemophilous, with minimal reliance on animal vectors. Abiotic factors highlight Cenchrus's resilience and ecosystem-altering potential, particularly through modifications to disturbance regimes. Species like C. ciliaris tolerate intense pressure better than many natives, resprouting from basal nodes and root crowns to recover quickly and maintain dominance. This tolerance allows persistence in heavily managed rangelands, though prolonged can reduce seed output. In terms of , invasive Cenchrus increases loads and continuity, promoting more frequent and severe wildfires—reaching temperatures up to 900°C—that favor its fire-adapted traits while eliminating less resilient natives. Post-fire resprouting and recruitment further exacerbate invasions, creating a loop that intensifies transformation.

Uses

Economic Importance

Cenchrus americanus, commonly known as , is a principal cereal crop within the , serving as a vital drought-tolerant for millions in semi-arid regions of and . It is cultivated across approximately 30 million s globally (as of 2023), with grain yields typically ranging from 1 to 3 tons per hectare under varying conditions, supporting an annual production of about 11 million tons of that nourishes over 90 million people. This crop's resilience to high temperatures exceeding 42°C and low rainfall makes it economically essential for in marginal lands where other cereals fail. Several Cenchrus species contribute significantly to and production, enhancing economies in tropical and subtropical areas. Cenchrus purpureus, or napier grass, is prized for its high biomass output, achieving 40-50 tons of dry matter per per year with multiple harvests, providing nutritious feed for cattle and other ruminants in regions like and . In contrast, , known as buffel grass, supports grazing in arid rangelands with yields sufficient to sustain up to one steer per on fertile soils, though its rapid spread as an often leads to substantial management costs that offset its benefits. Beyond food and feed, Cenchrus species offer value in and . Napier grass, with its high content exceeding 40% of dry , is increasingly utilized as a feedstock for production, such as bioethanol, due to its perennial nature and potential yields of over 20 tons of lignocellulosic material per annually. Additionally, like buffel grass are employed for in semi-arid environments, stabilizing soils through dense root systems and rapid establishment, thereby protecting agricultural productivity in vulnerable landscapes.

Ornamental Value

Several species of Cenchrus are valued in for their ornamental qualities, particularly their feathery inflorescences and arching foliage that add texture and movement to landscapes. Cenchrus setaceus, commonly known as fountain grass, is widely planted for its showy, elongated plumes that emerge in summer and persist into fall, making it suitable for borders, rock gardens, and mass plantings. Similarly, Cenchrus alopecuroides serves as a specimen plant or informal edging, with its bottlebrush-like flower spikes swaying in the breeze alongside perennials and shrubs to soften hardscape edges. Cultivars such as 'Hameln' of C. alopecuroides offer a compact form, typically reaching 0.6-1 m in height, ideal for smaller borders or pathway accents where space is limited. These grasses thrive in USDA hardiness zones 5-9, preferring full sun and well-drained soils to promote vigorous growth and flowering, though they tolerate partial shade with reduced bloom production. is straightforward via seed sowing in spring or by division of clumps as new growth emerges, allowing home gardeners to easily expand plantings. Their once established makes Cenchrus particularly appealing for designs, where they contribute to low-water landscapes without sacrificing aesthetic appeal. In the broader market, ornamental grasses like Cenchrus support a growing sector focused on sustainable and visually dynamic , with U.S. sales exceeding $158 million as of 2014 and global turf and ornamental inputs valued at over $5 billion annually. Cenchrus contributes through its role in drought-resistant varieties that align with trends in water-efficient landscaping.

Species

Accepted Species Overview

The genus Cenchrus comprises 108 accepted species, as recognized by in 2025. Predominantly annuals favoring subtropical environments, the genus includes recent distributional records such as C. spinifex newly reported from in 2024. Diversity within Cenchrus is concentrated primarily in and . This variation is reflected in morphological traits, particularly types—ranging from feathery to spinose—which delineate subgeneric groupings within the bristle clade. Taxonomic revisions of Cenchrus remain ongoing, influenced by the phylogenetic merger with Pennisetum, and certain species complexes, such as the C. incertus group, require further DNA-based clarification to resolve boundaries.

Notable Species

Cenchrus americanus, commonly known as , is an annual grass that grows to 1-3 meters in height with erect stems and pale green, cylindrical spikes up to 60 cm long forming bottle-brush-like inflorescences. It serves as a major staple crop in the of , where its and ability to thrive on infertile soils support for millions. Certain varieties exhibit resistance to (Sclerospora graminicola), a significant disease in millet production, enhancing its reliability in arid environments. Cenchrus ciliaris, or buffel grass, is a bunchgrass reaching 1-1.5 meters tall, characterized by its buff-colored burrs that enclose spikelets with retrorse spines, aiding . Introduced as a high-value in arid regions, it provides nutritious for but has become invasive in , where it outcompetes native and promotes more frequent and intense wildfires by increasing fuel loads. Cenchrus echinatus, southern sandbur, is an annual grass growing 0.3-1 meter high, producing distinctive spiny burrs that contain 1-3 seeds and readily attach to fur, clothing, or equipment. It is a widespread in lawns, pastures, and disturbed areas across the , reducing quality and causing mechanical injury to mouths and hides from the sharp spines. Cenchrus purpureum, napier grass, is a robust forming bamboo-like clumps up to 8 meters tall with often purple-tinged stems and broad leaves. Widely cultivated as a key tropical crop, it yields high for livestock feed, , and hay, though it is susceptible to Napier grass , which causes stunting and yield losses in infected stands.

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  59. https://www.greenhousegrower.com/crops/kelly-norris-diversity-is-the-key-to-growing-the-ornamental-grass-market/
  60. https://www.mordorintelligence.com/industry-reports/global-turf-and-ornamental-inputs-market-industry
  61. https://gd.eppo.int/reporting/article-7929
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  63. https://core.ac.uk/download/pdf/58915672.pdf
  64. https://plants.ces.ncsu.edu/plants/cenchrus-americanus/
  65. https://www.picturethisai.com/wiki/Cenchrus_americanus.html
  66. https://www.croptrust.org/knowledge-hub/crops/crops/pearl-millet/
  67. https://kstatelibraries.pressbooks.pub/feed-the-future-innovation/chapter/genetic-improvement-of-pearl-millet-in-senegal-past-present-and-future-prospects/
  68. https://www.researchgate.net/publication/262956177_Ecological_impacts_of_buffel_grass_Cenchrus_ciliaris_L_invasion_in_central_Australia_-_Does_field_evidence_support_a_fire-invasion_feedback
  69. https://edis.ifas.ufl.edu/publication/AG373
  70. https://www.cabidigitallibrary.org/doi/full/10.1079/cabicompendium.14501
  71. https://gardeningsolutions.ifas.ufl.edu/care/weeds-and-invasive-plants/weedy-grasses/
  72. https://keyserver.lucidcentral.org/weeds/data/media/Html/cenchrus_echinatus.htm
  73. https://tropicalforages.info/text/entities/cenchrus_purpureus__hybrids.htm
  74. https://apirs.plants.ifas.ufl.edu/site/assets/files/376081/376081.pdf
  75. https://www.feedipedia.org/node/395
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