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Quercus (oak)

Angiospermae - Fagales - Fagaceae

Taxonomy
Quercus was named by Linnaeus (1753). It is extant.

It was assigned to Fagaceae by Knowlton (1899), Berry (1914), Knowlton (1919), MacGinitie (1941), Brown (1959), Ozaki (1974), Lakhanpal et al. (1976), Shoshani et al. (1989), Chauhan (1991), Srivastava (1991), Liu et al. (1996), Mabberley (2000), Xing and Zhou (2013), He et al. (2014), Huang and Zhou (2015), Xu et al. (2016), Eshelman et al. (2025).

Species
Q. (Cyclobalanopsis), Q. (Heterobalanus), Q. abnormalis, Q. acrodon, Q. acuminata, Q. acutissima, Q. aegilops, Q. aemulans, Q. affinis, Q. agrifolia, Q. alaskana (syn. Q. pandurata), Q. alba, Q. alnoides, Q. angustiloba, Q. antiqua, Q. aquamara, Q. aquifolioides, Q. argentum, Q. asymmetrica, Q. balaninorum, Q. banksiaefolia, Q. baueri, Q. berryi (syn. Q. breweri), Q. bicornis, Q. bonnieri, Q. boweniana, Q. brevifolia, Q. breweri, Q. carbonensis (syn. Dryophyllum basidentatum), Q. castaneopsis, Q. castanoides, Q. castanopsis, Q. catesbaeifolia, Q. celastrifolia, Q. cerris, Q. chamissonis, Q. championii, Q. chaneyi, Q. chapmani, Q. chapmanifolia, Q. chrysolepis, Q. cinereoides, Q. clarnensis (syn. Q. affinis), Q. coccifera, Q. cognatus, Q. coloradensis, Q. competens, Q. consimilis, Q. convexa, Q. coriacea, Q. crossii, Q. culveri, Q. cuneata, Q. dakotensis, Q. dallii, Q. dawsoni, Q. dayana, Q. declinata, Q. dentata, Q. dentoni, Q. dentonoides, Q. digitata, Q. dilatata, Q. dispersa, Q. distincta, Q. doljensis (syn. Rhus pseudomeriani), Q. drymeja, Q. dryophyllopsis (syn. Q. latifolia), Q. dubia, Q. duriuscula, Q. eamesi (syn. Q. salicifolia), Q. elaena, Q. elaenoides, Q. elliptica, Q. ellisiana (syn. Q. pealei), Q. ellsworthianus, Q. eoprinoides, Q. eoxalapensis, Q. esculus, Q. eucalyptifolia (syn. Q. chlorophylloides), Q. evansii, Q. fisheriana, Q. flexuosa, Q. florissantensis (syn. Q. pyrifolia), Q. fraxinifolia, Q. furcinervis, Q. furuhjelmi, Q. gardneri, Q. gaudini, Q. glascoena, Q. glauca, Q. glennii, Q. godeti, Q. goepperti, Q. goldianus, Q. gramuntia, Q. griffithii, Q. grossidentata, Q. haidingeri, Q. hatcheri (syn. Q. cockerelli, Q. montana), Q. haugi, Q. haydeni, Q. hesperia, Q. hexagona, Q. hieracifolia, Q. hollickii, Q. holmesii (syn. Dryophyllum salicifolium), Q. horniana, Q. hosiana, Q. idahoensis, Q. ilex, Q. imbricaria, Q. incana, Q. johnstrupi, Q. judithae, Q. kanseana (syn. Hamamelites kansaseanus), Q. knowltoniana, Q. lambertensis, Q. lamellosa, Q. lantenoisi, Q. latifolia, Q. laurifolia, Q. lehmani, Q. lesquereuxiana (syn. Q. acrodon), Q. liaotungensis, Q. lonchitis, Q. lyrata, Q. lyratiformis, Q. macneilii, Q. macrocarpa, Q. magnifolia, Q. marylandica, Q. merriami (syn. Q. pseudolyrata angustiloba), Q. michauxii, Q. microdentata, Q. milleri, Q. minor, Q. miovariabilis, Q. mohavensis, Q. mongolica, Q. montana, Q. montanensis, Q. morrisoniana, Q. multinervis, Q. negundoides, Q. neomexicana, Q. nevadensis, Q. newberryi (syn. Q. cuneata), Q. nigra, Q. novaecaesareae, Q. oberlii, Q. obtusa, Q. olafseni, Q. oregoniana, Q. osbornii, Q. palustris, Q. pandurata, Q. parceserrata, Q. paucidentata, Q. payettensis, Q. penhallowi (syn. Q. laurifolia), Q. peritula, Q. phellos, Q. platanoides, Q. platinervis, Q. pliopalmeri, Q. poranoides, Q. praedumosa (syn. Q. turneri), Q. praegilva, Q. praenigra, Q. praeundulata (syn. Q. sinuata), Q. pratti, Q. predigitata, Q. prelobata, Q. previrginiana, Q. primordialis, Q. prinoides, Q. prinus, Q. protosalicina, Q. pseudoalba, Q. pseudoalnus, Q. pseudocastanea, Q. pseudochrysophylla, Q. pseudolyrata, Q. pseudowestfalica, Q. ramaleyi, Q. raritanensis, Q. ratonensis, Q. relongtanense, Q. renoana, Q. rhamnoides, Q. robur, Q. rockvalensis, Q. rubra, Q. rustii, Q. salicifolia, Q. scudderi, Q. semecarpifolia, Q. semialatus, Q. serra, Q. severnensis, Q. simplex, Q. simulata, Q. sinuata, Q. smilax, Q. spokanensis, Q. spurioilex, Q. stantoni, Q. steenstrupiana, Q. stramineus, Q. suber, Q. subvariabilis, Q. sullyi, Q. sumterensis, Q. suspecta, Q. transgressus, Q. turneri, Q. ursina, Q. valdensis, Q. vancouveriana (syn. Q. occidentalis, Dryophyllum elongatum, Dryophyllum neillianum), Q. velutina, Q. viburnifolia, Q. victoriae, Q. virginiana, Q. wardiana, Q. washingtonensis (syn. Q. elliptica), Q. weedii, Q. whitei, Q. wislizenoides, Q. wyomingiana, Q. yanceyi, Q. yulensis, Q. zeilleri
Species lacking formal opinion data
Q. Wardiana, Q. acorns, Q. bilobata, Q. castormontis, Q. changbaiensis, Q. coalingensis, Q. cuneatus, Q. dalli, Q. decora, Q. dissimilifolia, Q. domenginensis, Q. douglasoides, Q. dumosoides, Q. eocenica, Q. eoprinus, Q. explanata, Q. extincta, Q. farnetto, Q. gilliana, Q. gilva, Q. greenlandica, Q. grosidentata, Q. hannibali, Q. hannibali, Q. hannibalii, Q. haynesii, Q. kubinyi, Q. lakevillensis, Q. lantenoisii, Q. lianghensis, Q. lineata, Q. lusitanica, Q. macneili, Q. mccanni, Q. miocrispula, Q. monimotricha, Q. moyei, Q. myrsinifolia, Q. namlingensis, Q. nerifolia, Q. norini, Q. obliquifolia, Q. orbata, Q. paleocarpa, Q. parachampionii, Q. paradelavayi, Q. parahelferiana, Q. paraschottkyana, Q. parvula, Q. pasadorii, Q. pendunculata, Q. perdayana, Q. petros, Q. pliopalmerii, Q. pollardiana, Q. preglauca, Q. preguyavaefolia, Q. premonimotricha, Q. prespathulata, Q. preturbinella, Q. prevariabilis, Q. protoacuta, Q. protoaliena, Q. protodentata, Q. protoserrata, Q. protospathulata, Q. pseudosuber, Q. pubescens, Q. remingtoni, Q. remingtonii, Q. rhenana, Q. rhombifolia, Q. richardsoni, Q. roburoides, Q. salicina, Q. sapperi, Q. sayana, Q. schottii, Q. scottii, Q. semicarpifolia, Q. senescens, Q. serrata, Q. shrevoides, Q. sibirica, Q. sinomiocenicum, Q. snookensis, Q. spathulata, Q. stantonii, Q. stenophylla, Q. subguyavaefolia, Q. sundaica, Q. temblorensis, Q. treleasii, Q. trojana, Q. uglowi, Q. winstanleyi, Q. wislizenioides