All articles starting with Q
2,252 articles
Quercus × hispanica
Quercus × hispanica (Lucombe oak, Fulham oak, Spanish oak) is the accepted hybrid of Quercus cerris and Quercus suber, native from SE France to NW Croatia, semi-evergreen with corky bark, described by Lamarck in 1785.
Quercus × turneri
Quercus × turneri, Turner's oak, is a semi-evergreen hybrid oak of Quercus ilex × Q. robur, raised before 1780 by Spencer Turner in Essex, described by Willdenow in 1809, with an old specimen at Kew planted 1798.
Quercus × warei
Quercus × warei, Ware's oak, is a hybrid oak (Quercus bicolor × Q. robur 'Fastigiata') published in 1998, grown as columnar landscape cultivars Regal Prince ('Long') and Kindred Spirit ('Nadler') with powdery mildew resistance and USDA zone 4-9 hardiness.
Quercus acutissima
Quercus acutissima, the sawtooth oak (Japanese kunugi), is a deciduous oak native from the Himalaya to Korea and Japan, with bristle-tipped leaf teeth and biennial acorns.
Quercus alba
Quercus alba, white oak (stave oak), a large long-lived deciduous oak of eastern North America with rounded-lobed leaves, barrel-grade wood, and declining young age classes since 1988.
Quercus cerris
Quercus cerris, Turkey oak (Saçlı Meşe), a fast-growing deciduous oak of section Cerris native to S. Europe to Türkiye and Anti-Lebanon; two-year acorns, bristly cups, drought-tolerant, IUCN least concern.
Quercus coccinea
Quercus coccinea, scarlet oak (also Spanish oak), an eastern US red oak of dry upland soils, 50-80 ft tall, with C-shaped leaf sinuses, scarlet fall color, thin fire-susceptible bark, and vigorous postfire sprouting; state tree of Washington, DC.
Quercus douglasii
Quercus douglasii, the blue oak (also iron oak, mountain white oak), is a drought-deciduous California endemic oak dominating foothill woodlands around the Central Valley; IUCN Least Concern, but low recruitment and projected range loss under climate change concern conservationists.
Quercus ilex
Quercus ilex, holm or holly oak, an evergreen Mediterranean oak of Fagaceae, dominant in dehesa woodlands; over 2 million ha, two subspecies (ilex, ballota), low-rate hybridization with cork oak, drought-tolerant anisohydric physiology.
Quercus nigra
Quercus nigra (water oak, possum oak) is a fast-growing red-group oak of the southeastern US Coastal Plain and bottomlands, with spatulate leaves, small biennial black acorns, weak wood, and wide use as a southern street tree.
Quercus palustris
Quercus palustris, the pin oak (also swamp oak, water oak), is a fast-growing red oak of eastern North American bottomlands, 50–70 ft tall, requiring acid soil and developing iron chlorosis on alkaline sites.
Quercus petraea
Quercus petraea, the sessile or durmast oak, is a large European oak native to Europe and N. Iran, distinguished from Q. robur by stalkless acorns and long leaf stalks, drought-tolerant, and valued for timber and barrels.
Quercus pubescens
Quercus pubescens (downy oak, pubescent oak), a polymorphic European white oak with hairy leaves and twigs, native from France to Türkiye, xerophilous on chalky soils, hybridizing with Q. petraea and Q. robur.
Quercus robur
Quercus robur (English or pedunculate oak), a 20-40 m Fagaceae tree native from Europe to Iran, Britain's iconic oak, hybridizing with Q. petraea, timber for ships and Westminster Hall, IUCN Least Concern.
Quercus rubra
Quercus rubra, northern red oak (dąb czerwony, chêne rouge), a large deciduous oak native to eastern North America, introduced to Europe in 1691; fast-growing timber and ornamental tree, drought-tolerant, invasive in Central Europe, susceptible to oak wilt.
Quercus stellata
Quercus stellata, post oak or iron oak, a slow-growing white oak of the southeastern and south-central US, drought-resistant on dry uplands, living 300-400 years, with fencepost wood and Cross Timbers pure stands.
Quercus suber
Quercus suber, the cork oak, is an evergreen oak of the western and central Mediterranean whose bark is stripped periodically and regrown, chiefly for wine stoppers.
Quercus variabilis
Quercus variabilis (栓皮栎), the Chinese cork oak or oriental oak, is an East Asian deciduous oak to 30 m with thick corky bark, cork and tannin uses, IUCN Least Concern status, and a 787 Mb genome.
Quercus velutina
Quercus velutina, black oak or yellow oak, is a deciduous eastern North American red oak of dry upland slopes, with black furrowed bark, yellow bitter inner bark (quercitron dye), biennial acorns, and wood sold as red oak.
Quercus virginiana
Quercus virginiana, the southern live oak (Virginia live oak), is a nearly evergreen southeastern US coastal plain oak with crowns to 150 ft, extremely dense wood used in USS Constitution shipbuilding, high salt tolerance, and G5/LC conservation status.
Querelle
Querelle (1982) is Rainer Werner Fassbinder's final film, adapted from Jean Genet's novel Querelle de Brest, starring Brad Davis, Franco Nero, and Jeanne Moreau; a stylized, homoerotic drama set in an artificial Brest, precursor to New Queer Cinema.
Querétaro
Querétaro Arteaga is a central Mexican state, capital Santiago de Querétaro, 18 municipalities, 2.37 million people (2020). A development outlier growing over 3.8% annually since 1981, driven by automotive and aerospace industries, but facing aquifer overexploitation.
Querétaro F.C.
Querétaro F.C. (Gallos Blancos), Mexican Liga MX club founded 8 July 1950 in Santiago de Querétaro; plays at Estadio Corregidora (34,107); Copa MX 2016, Supercopa MX 2017, Clausura 2015 runners-up.
Quern-stone
A quern-stone, or quern, is a stone tool for hand-grinding grain into flour, with saddle and rotary forms used for most of the last ten thousand years.
Query by example
Query by example (QBE) is a retrieval method in which the user supplies a specimen, such as an image or a filled-in record, and the system returns matching items.
Query expansion
Query expansion is an information retrieval technique that adds terms of similar meaning to a user's query, so search retrieves documents the original keywords would have missed.
Query federation
Query federation executes a single query across multiple autonomous data sources through one interface, leaving data in place instead of copying it (data virtualization). Key systems include Trino, Denodo, Dremio, Teiid, and FedX; standards include SPARQL 1.1 Federated Query.
Query language
A query language, also known as a database query language, is a computer language for requesting information from a database, the dominant example being SQL.
Query optimization
Query optimization, also called query planning, is the process by which a database management system chooses the fastest or cheapest execution plan for a SQL query.
Query optimizer
A query optimizer is the component of a database management system that chooses an efficient execution plan for a SQL query, selecting join orders, algorithms, and access paths by cost.