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Ilex //, or holly, is a genus of 400 to 600 species of flowering plants in the family Aquifoliaceae, and the only living genus in that family. The species are evergreen and deciduous trees, shrubs, and climbers from tropics to temperate zones worldwide.
The genus Ilex is widespread throughout the temperate and subtropical regions of the world. It includes species of trees, shrubs, and climbers, with evergreen or deciduous foliage and inconspicuous flowers. Its range was more extended in the Tertiary period and many species are adapted to laurel forest habitat. It occurs from sea level to more than 2,000 metres (6,600 ft) with high mountain species. It is a genus of small, evergreen trees with smooth, glabrous, or pubescent branchlets. The plants are generally slow-growing with some species growing to 25 m (82 ft) tall. The type species is the European holly Ilex aquifolium described by Linnaeus.
Plants in this genus have simple, alternate glossy leaves, typically with a spiny toothed, or serrated leaf margin. The inconspicuous flower is greenish white, with four petals. They are generally dioecious, with male and female flowers on different plants.
The small fruits of Ilex, although often referred to as berries, are technically drupes. They range in color from red to brown to black, and rarely green or yellow. The "bones" contain up to ten seeds each. Some species produce fruits parthenogenetically, such as the cultivar 'Nellie R. Stevens'. The fruits ripen in winter and thus provide winter colour contrast between the bright red of the fruits and the glossy green evergreen leaves. Hence the cut branches, especially of I. aquifolium, are widely used in Christmas decoration. The fruits are generally slightly toxic to humans, and can cause vomiting and diarrhea when ingested. However, they are an important food source for birds and other animals, which help disperse the seeds.
Ilex in Latin means the holm-oak or evergreen oak (Quercus ilex). Despite the Linnaean classification of Ilex as holly, as late as the 19th century in Britain, the term Ilex was still being applied to the oak as well as the holly – possibly due to the superficial similarity of the leaves. The name "holly" in common speech refers to Ilex aquifolium, specifically stems with berries used in Christmas decoration. By extension, "holly" is also applied to the whole genus. The origin of the word "holly" is considered a reduced form of Old English hole(ġ)n, Middle English Holin, later Hollen.  The French word for holly, houx, derives from the Old Low Franconian *hulis (Middle Dutch huls). Both are related to Old High German hulis, huls, as are Low German/Low Franconian terms like Hülse or hulst. These Germanic words appear to be related to words for holly in Celtic languages, such as Welsh celyn, Breton kelen(n) and Irish cuileann. 
The phylogeography of this group provides examples of various speciation mechanisms at work. In this scenario ancestors of this group became isolated from the remaining Ilex when the Earth mass broke away into Gondwana and Laurasia about 82 million years ago, resulting in a physical separation of the groups and beginning a process of change to adapt to new conditions. This mechanism is called allopatric speciation. Over time survivor species of the holly genus adapted to different ecological niches. This led to reproductive isolation, an example of ecological speciation. In the Pliocene, around five million years ago, mountain formation diversified the landscape and provided new opportunities for speciation within the genus.
The fossil record indicates that the Ilex lineage was already widespread prior to the end of the Cretaceous period. Based on the molecular clock the common ancestor of most of the extant species probably appeared during the Eocene, about 50 million years ago, suggesting that older representatives of the genus belong to now extinct branches. The laurel forest covered great areas of the Earth during the Paleogene, when the genus was more prosperous. This type of forest extended during the Neogene, more than 20 million years ago. Most of the last remaining temperate evergreen forests are believed to have disappeared about 10,000 years ago at the end of the Pleistocene. Many of the then existing species with the strictest ecological requirements became extinct because they could not cross the barriers imposed by the geography, but others found refuge as a species relict in coastal enclaves, archipelagos, and coastal mountains sufficiently far from the extreme cold and aridity and protected by the oceanic influence.
The genus includes about 400 to 600 species, divided into three subgenera:
- Ilex subg. Byronia, with the type species Ilex polypyrena
- Ilex subg. Prinos, with 12 species
- Ilex subg. Ilex, with the rest of the over 400 species
The genus is distributed throughout the world's different climates. Most species make their home in the tropics and subtropics, with a worldwide distribution in temperate zones. The greatest diversity of species is found in the Americas and in Southeast Asia.
Ilex mucronata, formerly the type species of Nemopanthus, is native to eastern North America. Nemopanthus was treated as a monotypic genus with eight species. of the family Aquifoliaceae, now transferred to Ilex on molecular data; it is closely related to Ilex amelanchier.
In Europe the genus is represented by a single species, the classically named holly Ilex aquifolium, and in continental Africa by this species and (Ilex mitis). Ilex canariensis, from Macaronesia, and Ilex aquifolium arose from a common ancestor in the laurel forests of the Mediterranean. Australia, isolated at an early period, has (Ilex arnhemensis). Of 204 species growing in China, 149 species are endemic. A species which stands out for its economic importance in Spanish-speaking countries is Ilex paraguariensis or Yerba mate. Having evolved numerous species that are endemic to islands and small mountain ranges, and being highly useful plants, many hollies are now becoming rare.
They are extremely important food for numerous species of birds, and also are eaten by other wild animals. In the autumn and early winter the fruits are hard and apparently unpalatable. After being frozen or frosted several times, the fruits soften, and become milder in taste. During winter storms, birds often take refuge in hollies, which provide shelter, protection from predators (by the spiny leaves), and food. The flowers are sometimes eaten by the larva of the Double-striped Pug moth (Gymnoscelis rufifasciata). Other Lepidoptera whose larvae feed on holly include Bucculatrix ilecella, which feeds exclusively on hollies, and The Engrailed (Ectropis crepuscularia).
Holly can contain caffeic acid, caffeoyl derivatives, caffeoylshikimic acid, chlorogenic acid, feruloylquinic acid, quercetin, quinic acid, kaempferol, tannins, rutin, caffeine, and theobromine.
Holly berries can cause vomiting and diarrhea. They are especially dangerous in cases involving accidental consumption by children attracted to the bright red berries. Ingestion of over 20 berries may be fatal to children.
Holly leaves if eaten might cause diarrhea, nausea, vomiting, and stomach and intestinal problems.
Holly plants might be toxic to pets and livestock.
Leaves of some holly species are (or were) used by some cultures to make daily tea. Leaves of other species, such as gallberry (I. glabra) are bitter and emetic.  In general little is known about inter-species variation in constituents or toxicity of hollies.
Many of the holly species are widely used as ornamental plants in temperate/European gardens and parks, notably:
Moreover, many hundreds of hybrids and cultivars have been developed for garden use, among them the very popular "Highclere holly", Ilex × altaclerensis (I. aquifolium × I. perado) and the "blue holly", Ilex × meserveae (I. aquifolium × I. rugosa). Hollies are often used for hedges; the spiny leaves make them difficult to penetrate, and they take well to pruning and shaping.
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Holly – more specifically the European holly, Ilex aquifolium – is commonly referenced at Christmas time. In many western cultures, holly is a traditional Christmas decoration, used especially in wreaths and illustrations, for instance on Christmas cards. Since medieval times the plant has carried a Christian symbolism, as expressed in the well-known carol "The Holly and the Ivy". However, the association of holly with winter celebrations almost certainly pre-dates Christianity. Druids wore holly wreaths on their heads.
In heraldry, holly is used to symbolize truth.
The Norwegian municipality of Stord has a yellow twig of holly in its Coat-of-arms.
In the Harry Potter novels, holly is used as the wood in the titular character's wand.
- Ilex abscondita
- Ilex acutidenticulata
- Ilex affinis
- Ilex × altaclarensis
- Ilex altiplana
- Ilex amara – Caachira
- Ilex ambigua – Sand Holly
- Ilex amelanchier – Swamp Holly
- Ilex anomala Hook. & Arn. – Kāwaʻu (Hawaiʻi)
- Ilex anonoides
- Ilex aquifolium – European Holly, English Holly, Christ's Thorn
- Ilex aquifolium 'Ferox' – Hedgehog holly
- Ilex aracamuniana
- Ilex argentina
- Ilex arisanensis
- Ilex arnhemensis – Northern Holly (Northern Australia)
- Ilex bioritsensis
- Ilex brachyphylla
- Ilex brasiliensis
- Ilex brevicuspis
- Ilex brevipedicellata
- Ilex buergeri
- Ilex canariensis – Small-leaved Holly, Acebino
- Ilex caniensis
- Ilex cassine – Dahoon Holly, Cassena
- Ilex centrochinensis
- Ilex cerasifolia
- Ilex chamaedryfolia
- Ilex chapaensis
- Ilex chengkouensis
- Ilex chinensis
- Ilex chuniana
- Ilex ciliolata
- Ilex ciliospinosa
- Ilex cognata
- Ilex colchica
- Ilex collina
- Ilex conocarpa
- Ilex cookii – Cook's Holly (Puerto Rico)
- Ilex corallina
- Ilex coriacea – Gallberry
- Ilex cornuta – Chinese Holly, Horned Holly
- Ilex costaricensis
- Ilex cowanii
- Ilex crenata – Japanese Holly, Box-leaved Holly, inutsuge (Japanese)
- Ilex crepitans
- Ilex cyrtura
- Ilex dabieshanensis
- Ilex davidsei
- Ilex decidua Walter – Possumhaw (Eastern United States, Northeastern Mexico)
- Ilex dehongensis
- Ilex dimorphophylla
- Ilex diospyroides
- Ilex dipyrena – Himalayan Holly
- Ilex dumosa
- Ilex ericoides
- Ilex euryoides
- Ilex fargesii
- Ilex fengqingensis
- Ilex fertilis
- Ilex florifera
- Ilex gardneriana (extinct: 20th century?)
- Ilex geniculata
- Ilex georgei
- Ilex gigantea
- Ilex glabella
- Ilex glabra L. A.Gray – Evergreen Winterberry, Bitter Gallberry, Inkberry (Eastern North America)
- Ilex gleasoniana
- Ilex glomerata
- Ilex goshiensis
- Ilex graciliflora
- Ilex grandiflora
- Ilex guaiquinimae
- Ilex guayusa – Guayusa
- Ilex guianensis
- Ilex harrisii
- Ilex hemiepiphytica
- Ilex holstii
- Ilex huachamacariana
- Ilex humboldtiana
- Ilex ignicola
- Ilex illustris
- Ilex integerrima
- Ilex integra – Mochi Tree, Nepal Holly
- Ilex intricata
- Ilex jamaicana Proctor (Jamaica)
- Ilex jauaensis
- Ilex jelskii
- Ilex karuaiana
- Ilex khasiana
- Ilex kingiana
- Ilex kudingcha
- Ilex kusanoi
- Ilex laevigata – Smooth Winterberry
- Ilex lasseri
- Ilex latifolia – Tarajo Holly, tarayō (Japanese)
- Ilex lechleri
- Ilex leucoclada
- Ilex longipes
- Ilex longzhouensis
- Ilex machilifolia
- Ilex maclurei
- Ilex macoucoua
- Ilex macrocarpa
- Ilex macropoda
- Ilex magnifructa
- Ilex maingayi
- Ilex marahuacae
- Ilex marginata
- Ilex margratesavage
- Ilex mathewsii
- Ilex × meserveae
- Ilex microdonta
- Ilex mitis
- Ilex montana Torrey & A.Gray – Mountain Winterberry (Eastern United States)
- Ilex mucronata (L.) M.Powell, Savol., & S.Andrews – Mountain Holly, Catberry (Eastern North America)
- Ilex myrtifolia – Myrtle Holly, Myrtle Dahoon
- Ilex neblinensis
- Ilex nothofagifolia
- Ilex oblonga
- Ilex occulta
- Ilex opaca – American Holly (Eastern United States)
- Ilex ovalifolia
- Ilex palawanica
- Ilex pallida
- Ilex paraguariensis – Yerba mate (mate, erva-mate)
- Ilex parvifructa
- Ilex patens
- Ilex pauciflora
- Ilex paujiensis
- Ilex pedunculosa – Longstalked holly
- Ilex peiradena
- Ilex perado – Madeiran Holly
- Ilex perlata
- Ilex pernyi – Perny's Holly
- Ilex polita
- Ilex praetermissa
- Ilex pringlei
- Ilex pseudobuxus
- Ilex puberula
- Ilex pubescens
- Ilex pubiflora
- Ilex purpurea
- Ilex qianlingshanensis
- Ilex quercetorum
- Ilex quercifolia
- Ilex rarasanensis
- Ilex reticulata
- Ilex rotunda
- Ilex rugosa
- Ilex sclerophylla
- Ilex serrata – Japanese Winterberry
- Ilex sessilifructa
- Ilex shimeica
- Ilex sikkimensis
- Ilex sintenisii (Urban) Britt. – Sintenis' Holly (Puerto Rico)
- Ilex sipapoana
- Ilex socorroensis
- Ilex spinigera
- Ilex spruceana
- Ilex steyermarkii
- Ilex subrotundifolia
- Ilex subtriflora
- Ilex sugerokii
- Ilex sulcata
- Ilex syzygiophylla
- Ilex tahanensis
- Ilex tarapotina
- Ilex tateana
- Ilex taubertiana
- Ilex ternatiflora (extinct: 20th century?)
- Ilex theezans
- Ilex tiricae
- Ilex tolucana
- Ilex trachyphylla
- Ilex trichocarpa
- Ilex tugitakayamensis
- Ilex uraiensis
- Ilex urbaniana – Urban's holly
- Ilex vaccinoides
- Ilex venezuelensis
- Ilex venulosa
- Ilex verticillata (L.) A.Gray American Winterberry (Eastern North America)
- Ilex vomitoria – Yaupon Holly, casseena (Spanish)
- Ilex vulcanicola
- Ilex wenchowensis
- Ilex williamsii
- Ilex wilsonii
- Ilex yunnanensis
- Ilex wugonshanensis
- Ilex yuiana
- Sunset Western Garden Book 1995:606–607
- "Index Nominum Genericorum". 2009-02-05.
- "Kew Plants and Fungi". 2012-04-11.
- Shorter Oxford English dictionary, 6th ed. United Kingdom: Oxford University Press. 2007. p. 3804. ISBN 0199206872.
- Abbe, Elfriede Martha (1965). The plants of Virgil's Georgics. Cornell University Press. p. 88.
- Middle English Holin, later Hollen. Skeat, Walter William (1887). Principles of English etymology, Volume 1. London, U.K.: Clarendon Press. p. 371.
- T. F. Hoad, English Etymology, Oxford University Press, 1993 (ISBN 0-19-283098-8), p. 218b.
- Skeat, Walter William (2005). A Concise Etymological Dictionary of the English Language. Cosimo, Inc. p. 244. ISBN 978-1-59605-092-1.
- etymology of "houx" (French)
- Pick, Edward (1869). An etymological dictionary of the French language. Murray. p. 106.
- Skeat, Walter William (1882). An etymological dictionary of the English language. Clarendon Press. p. 269.
- Nettleship, Henry (1889). Contributions to Latin lexicography. Clarendon Press. p. 27.
- Loizeau, P.-A.; Barriera G., Manen J.-F. & Broennimann O. (2005). "Towards an understanding of Ilex L. (Aquifoliaceae) on a World-wide scale". In Friis I., Balslev H.,. Plant diversity and complexity patterns: local, regional, and global dimensions : proceedings of an international symposium held at the Royal Danish Academy of Sciences and Letters in Copenhagen, Denmark, 25–28 May 2003. Biologiske skrifter 55. Kongelige Danske videnskabernes selskab. pp. 507–517. ISBN 978-87-7304-304-2. Retrieved 9 April 2012.
- Germplasm Resources Information Network: Ilex mucronata
- Species PPP-index
- Powell, M., Savolainen, V., Cuénod, P., Manen, J. F., & Andrews, S. (2000). The mountain holly (Nemopanthus mucronatus: Aquifoliaceae) revisited with molecular data. Kew Bulletin 55: 341–347.
- Alexandra M. Gottlieb, Gustavo C. Giberti & Lidia Poggio (2005). "Molecular analyses of the genus Ilex (Aquifoliaceae) in southern South America, evidence from AFLP and ITS sequence data". American Journal of Botany 92 (2): 352–369. doi:10.3732/ajb.92.2.352. JSTOR 4123880. PMID 21652411.
- International Union for Conservation of Nature and Natural Resources (IUCN) (2007): 2007IUCN Red List of Threatened Species:Ilex]
- "Toxicity of Holly". Retrieved 3 March 2014.
- "HOLLY". webmd.com. Retrieved 3 March 2014.
- "American Holly". aspca. Retrieved 3 March 2014.
- Austin, Daniel F. (2004). Florida Ethnobotany. CRC Press. p. 363.
- RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. p. 1136. ISBN 1405332964.
- Huxley, A., ed. (1992). New RHS Dictionary of Gardening. Macmillan ISBN 0-333-47494-5.
- Northumbria Police: Security starts at the Garden Gate
- Little Jr., Elbert L.; Roger G. Skolmen (1989). "Kāwaʻu, Hawaiian holly" (PDF). United States Forest Service.
- Ulloa Ulloa & Jørgensen (1993), eFloras.org (2007a, b), IUCN (2007), RBGE (2007), USDA (2007a, b)