| Common Name | Scientific Name | Code |
| n/a | Castanea ?neglecta Dode (pro sp.) [dentata ? pumila] | CANE7 |
| n/a | Castanopsis (D.Don) Spach | CASTA7 |
| n/a | Castanopsis sclerophylla (Lindl. & Paxton) Schottky | CASC38 |
| n/a | Quercus ?acutidens Torr. [cornelius-mulleri ? engelmannii] | QUAC3 |
| n/a | Quercus ?ashei Trel. [incana ? laevis] | QUAS3 |
| n/a | Quercus ?atlantica Ashe (pro sp.) [incana ? laurifolia] | QUAT |
| n/a | Quercus ?beadlei Trel. ex Palmer [alba ? michauxii] | QUBE |
| n/a | Quercus ?beaumontiana Sarg. [falcata ? laurifolia] | QUBE2 |
| n/a | Quercus ?bebbiana Schneid. [alba ? macrocarpa] | QUBE3 |
| n/a | Quercus ?beckyae Gaynor [macrocarpa ? prinoides] | QUBE8 |
| n/a | Quercus ?benderi Baenitz [coccinea ? rubra] | QUBE9 |
| n/a | Quercus ?bernardiensis W. Wolf (pro sp.) [prinus ? stellata] | QUBE4 |
| n/a | Quercus ?bimundorum Palmer [alba ? robur] | QUBI2 |
| n/a | Quercus ?blufftonensis Trel. [falcata ? laevis] | QUBL |
| n/a | Quercus ?brittonii W.T. Davis (pro sp.) [ilicifolia ? marilandica] | QUBR |
| n/a | Quercus ?burnetensis Little [macrocarpa ? virginiana] | QUBU3 |
| n/a | Quercus ?bushii Sarg. [marilandica ? velutina] | QUBU |
| n/a | Quercus ?byarsii Sudworth [macrocarpa ? michauxii] | QUBY |
| n/a | Quercus ?caduca Trel. [incana ? nigra] | QUCA |
| n/a | Quercus ?caesariensis Moldenke [falcata ? ilicifolia] | QUCA3 |
| n/a | Quercus ?capesii W. Wolf [nigra ? phellos] | QUCA2 |
| n/a | Quercus ?cocksii Sarg. [laurifolia ? velutina] | QUCO5 |
| n/a | Quercus ?columnaris Laughlin [palustris ? rubra] | QUCO4 |
| n/a | Quercus ?comptoniae Sarg. [lyrata ? virginiana] | QUCO3 |
| n/a | Quercus ?cravenensis Little [incana ? marilandica] | QUCR |
| n/a | Quercus ?deamii Trel. [macrocarpa ? muehlenbergii] | QUDE |
| n/a | Quercus ?demareei Ashe [nigra ? velutina] | QUDE2 |
| n/a | Quercus ?discreta Laughlin [shumardii ? velutina] | QUDI |
| n/a | Quercus ?diversiloba Tharp ex A. Camus [laurifolia ? marilandica] | QUDI2 |
| n/a | Quercus ?egglestonii Trel. [imbricaria ? shumardii] | QUEG |
| n/a | Quercus ?eplingii C.H. Muller [douglasii ? garryana] | QUEP |
| n/a | Quercus ?exacta Trel. [imbricaria ? palustris] | QUEX |
| n/a | Quercus ?faxonii Trel. [alba ? prinoides] | QUFA2 |
| n/a | Quercus ?fernaldii Trel. [ilicifolia ? rubra] | QUFE |
| n/a | Quercus ?fernowii Trel. [alba ? stellata] | QUFE2 |
| n/a | Quercus ?filialis Little [phellos ? velutina] | QUFI |
| n/a | Quercus ?fontana Laughlin [coccinea ? velutina] | QUFO |
| n/a | Quercus ?ganderi C.B. Wolf [agrifolia ? kelloggii] | QUGA2 |
| n/a | Quercus ?garlandensis Palmer [falcata ? nigra] | QUGA3 |
| n/a | Quercus ?giffordii Trel. [ilicifolia ? phellos] | QUGI |
| n/a | Quercus ?grandidentata Ewan (pro sp.) [dumosa ? engelmannii] | QUGR4 |
| n/a | Quercus ?guadalupensis Sarg. [macrocarpa ? stellata] | QUGU |
| n/a | Quercus ?harbisonii Sarg. [stellata ? virginiana] | QUHA |
| n/a | Quercus ?hastingsii Sarg. [marilandica ? shumardii] | QUHA2 |
| n/a | Quercus ?hawkinsiae Sudworth [rubra ? velutina] | QUHA4 |
| n/a | Quercus ?heterophylla Michx. f. (pro sp.) [phellos ? rubra] | QUHE |
| n/a | Quercus ?howellii Tucker [dumosa ? garryana] | QUHO |
| n/a | Quercus ?humidicola Palmer [bicolor ? lyrata] | QUHU |
| n/a | Quercus ?incomita Palmer [falcata ? marilandica] | QUIN5 |
| n/a | Quercus ?inconstans Palmer [gravesii ? hypoleucoides] | QUIN2 |
| n/a | Quercus ?introgressa P.M. Thompson [bicolor ? (muehlenbergii ? prinoides)] | QUIN4 |
| n/a | Quercus ?jackiana Schneid. [alba ? bicolor] | QUJA |
| n/a | Quercus ?jolonensis Sarg. [douglasii ? lobata] | QUJO |
| n/a | Quercus ?joorii Trel. [falcata ? shumardii] | QUJO4 |
| n/a | Quercus ?leana Nutt. (pro sp.) [imbricaria ? velutina] | QULE |
| n/a | Quercus ?ludoviciana Sarg. [pagoda ? phellos] | QULU |
| n/a | Quercus ?macnabiana Sudworth [sinuata ? stellata] | QUMA |
| n/a | Quercus ?megaleia Laughlin [lyrata ? macrocarpa] | QUME2 |
| n/a | Quercus ?mellichampii Trel. ex Sarg. [laevis ? laurifolia] | QUME |
| n/a | Quercus ?moultonensis Ashe (pro sp.) [phellos ? shumardii] | QUMO3 |
| n/a | Quercus ?munzii Tucker [lobata ? turbinella] | QUMU3 |
| n/a | Quercus ?mutabilis Palmer & Steyermark [palustris ? shumardii] | QUMU2 |
| n/a | Quercus ?neopalmeri Sudworth ex Palmer [nigra ? shumardii] | QUNE |
| n/a | Quercus ?neotharpii A. Camus [minima ? stellata] | QUNE2 |
| n/a | Quercus ?nessiana Palmer [bicolor ? virginiana] | QUNE3 |
| n/a | Quercus ?organensis Trel. [arizonica ? grisea] | QUOR |
| n/a | Quercus ?oviedoensis Sarg. [incana ? myrtifolia] | QUOV |
| n/a | Quercus ?palaeolithicola Trel. [ellipsoidalis ? velutina] | QUPA |
| n/a | Quercus ?palmeriana A. Camus [falcata ? imbricaria] | QUPA3 |
| n/a | Quercus ?pauciloba Rydb. (pro sp.) [gambelii ? turbinella] | QUPA4 |
| n/a | Quercus ?podophylla Trel. [incana ? velutina] | QUPO |
| n/a | Quercus ?rehderi Trel. [ilicifolia ? velutina] | QURE |
| n/a | Quercus ?riparia Laughlin [rubra ? shumardii] | QURI |
| n/a | Quercus ?robbinsii Trel. [coccinea ? ilicifolia] | QURO |
| n/a | Quercus ?rolfsii Small (pro sp.) [chapmanii ? minima] | QURO4 |
| n/a | Quercus ?rudkinii Britt. (pro sp.) [marilandica ? phellos] | QURU2 |
| n/a | Quercus ?runcinata (A. DC.) Engelm. [imbricaria ? rubra] | QURU3 |
| n/a | Quercus ?sargentii Rehd. [prinus ? robur] | QUSA3 |
| n/a | Quercus ?saulii Schneid. [alba ? prinus] | QUSA |
| n/a | Quercus ?schochiana Dieck ex Palmer [palustris ? phellos] | QUSC |
| n/a | Quercus ?schuettei Trel. [bicolor ? macrocarpa] | QUSC2 |
| n/a | Quercus ?smallii Trel. [georgiana ? marilandica] | QUSM |
| n/a | Quercus ?stelloides Palmer [prinoides ? stellata] | QUST2 |
| n/a | Quercus ?sterilis Trel. ex Palmer [marilandica ? nigra] | QUST3 |
| n/a | Quercus ?sterretii Trel. [lyrata ? stellata] | QUST4 |
| n/a | Quercus ?subconvexa Tucker [durata ? garryana] | QUSU4 |
| n/a | Quercus ?subfalcata Trel. [falcata ? phellos] | QUSU6 |
| n/a | Quercus ?subintegra (Engelm.) Trel. [falcata ? incana] | QUSU2 |
| n/a | Quercus ?substellata Trel. [bicolor ? stellata] | QUSU3 |
| n/a | Quercus ?tharpii C.H. Muller (pro sp.) [emoryi ? graciliformis] | QUTH |
| n/a | Quercus ?tottenii Melvin [lyrata ? michauxii] | QUTO4 |
| n/a | Quercus ?townei Palmer [dumosa ? lobata] | QUTO3 |
| n/a | Quercus ?tridentata (Engelm. ex A. DC.) Trel. (pro sp.) [imbricaria ? marilandica] | QUTR |
| n/a | Quercus ?vaga Palmer & Steyermark [palustris ? velutina] | QUVA2 |
| n/a | Quercus ?venulosa Ashe [arkansana ? incana] | QUVE2 |
| n/a | Quercus ?wagneri Gaynor [bicolor ? prinoides] | QUWA2 |
| n/a | Quercus ?walteriana Ashe [laevis ? nigra] | QUWA |
| n/a | Quercus ?willdenowiana (Dippel) Beissner, Schelle & Zabel (pro sp.) [falcata ? velutina] | QUWI |
| n/a | Quercus chenii Nakai | QUCH5 |
| n/a | Quercus serrata Thunb. | QUSE2 |
| n/a | Quercus variabilis Blume [excluded] | QUVA3 |
| Ajo Mountain scrub oak | Quercus ajoensis C.H. Muller | QUAJ |
| aleppo oak | Quercus infectoria Olivier | QUIN6 |
| Alvord oak | Quercus ?alvordiana Eastw. (pro sp.) [douglasii ? turbinella] | QUAL2 |
| American beech | Fagus grandifolia Ehrh. | FAGR |
| American chestnut | Castanea dentata (Marsh.) Borkh. | CADE12 |
| Arizona white oak | Quercus arizonica Sarg. | QUAR |
| Arkansas oak | Quercus arkansana Sarg. | QUAR2 |
| bastard oak | Quercus sinuata Walt. | QUSI |
| bastard oak | Quercus sinuata Walt. var. breviloba (Torr.) C.H. Muller | QUSIB |
| bastard oak | Quercus sinuata Walt. var. sinuata | QUSIS |
| bastard white oak | Quercus austrina Small | QUAU |
| bear oak | Quercus ilicifolia Wangenh. | QUIL |
| beech | Fagus L. | FAGUS |
| black oak | Quercus velutina Lam. | QUVE |
| blackjack oak | Quercus marilandica (L.) Muenchh. | QUMA3 |
| blackjack oak | Quercus marilandica (L.) Muenchh. var. ashei Sudworth | QUMAA2 |
| blackjack oak | Quercus marilandica (L.) Muenchh. var. marilandica | QUMAM2 |
| blue oak | Quercus douglasii Hook. & Arn. | QUDO |
| bluejack oak | Quercus incana Bartr. | QUIN |
| bottomland post oak | Quercus similis Ashe | QUSI2 |
| Boynton sand post oak | Quercus boyntonii Beadle | QUBO2 |
| Brant's oak | Quercus brantii Lindley | QUBR2 |
| Buckley oak | Quercus buckleyi Nixon & Dorr | QUBU2 |
| bur oak | Quercus macrocarpa Michx. | QUMA2 |
| bur oak | Quercus macrocarpa Michx. var. depressa (Nutt.) Engelm. | QUMAD |
| bur oak | Quercus macrocarpa Michx. var. macrocarpa | QUMAM |
| bush chinquapin | Chrysolepis sempervirens (Kellogg) Hjelmqvist | CHSE11 |
| California black oak | Quercus kelloggii Newberry | QUKE |
| California live oak | Quercus agrifolia N | QUAG |
| California live oak | Quercus agrifolia N?e var. agrifolia | QUAGA |
| canyon live oak | Quercus chrysolepis Liebm. | QUCH2 |
| canyon live oak | Quercus chrysolepis Liebm. var. chrysolepis | QUCHC |
| canyon live oak | Quercus chrysolepis Liebm. var. nana (Jepson) Jepson | QUCHN |
| Castanea crenata | Castanea japonica Blume | CAJA10 |
| Castanea crenata | Castanea pubinervis (Hassk.) C. Schneider | CAPU41 |
| Castanea crenata | Castanea stricta Siebold & Zucc. | CAST48 |
| Castanea dentata | Castanea americana (Michaux) Raf. | CAAM29 |
| Castanea mollissima | Castanea bungeana Blume | CABU11 |
| Castanea mollissima | Castanea formosana (Hayata) Hayata | CAFO9 |
| Castanea pumila var. ozarkensis | Castanea alabamensis Ashe | CAAL9 |
| Castanea pumila var. ozarkensis | Castanea ozarkensis Ashe | CAOZ |
| Castanea pumila var. ozarkensis | Castanea ozarkensis Ashe var. arkansana (Ashe) Ashe | CAOZA |
| Castanea pumila var. pumila | Castanea alnifolia Nutt. | CAAL10 |
| Castanea pumila var. pumila | Castanea alnifolia Nutt. var. floridana Sarg. | CAALF |
| Castanea pumila var. pumila | Castanea ashei (Sudworth) Sudworth | CAAS4 |
| Castanea pumila var. pumila | Castanea floridana (Sarg.) Ashe | CAFL25 |
| Castanea pumila var. pumila | Castanea pumila (L.) P. Mill. var. ashei Sudworth | CAPUA |
| Castanea pumila var. pumila | Castanea pumila (L.) P. Mill. var. margarettiae Ashe | CAPUM3 |
| Castanea sativa | Castanea vesca Gaertner | CAVE21 |
| Castanea sativa | Castanea vulgaris Lam. | CAVU5 |
| Cedros Island oak | Quercus cedrosensis C.H. Muller | QUCE2 |
| Channel Island scrub oak | Quercus pacifica Nixon & C.H. Muller | QUPA6 |
| Chapman oak | Quercus chapmanii Sarg. | QUCH |
| cherrybark oak | Quercus pagoda Raf. | QUPA5 |
| chestnut | Castanea P. Mill. | CASTA |
| chestnut oak | Quercus prinus L. | QUPR2 |
| Chihuahuan oak | Quercus chihuahuensis Trel. | QUCH4 |
| Chinese chestnut | Castanea mollissima Blume | CAMO83 |
| chinkapin | Castanea pumila (L.) P. Mill. | CAPU9 |
| chinkapin | Castanea pumila (L.) P. Mill. var. pumila | CAPUP3 |
| chinkapin oak | Quercus muehlenbergii Engelm. | QUMU |
| chinquapin | Chrysolepis Hjelmquist | CHRYS15 |
| Chisos oak | Quercus graciliformis C.H. Muller | QUGR |
| Chisos red oak | Quercus gravesii Sudworth | QUGR2 |
| Chrysolepis chrysophylla var. chrysophylla | Castanopsis chrysophylla (Dougl. ex Hook.) A. DC. | CACH6 |
| Chrysolepis chrysophylla var. minor | Castanopsis chrysophylla (Dougl. ex Hook.) A. DC. var. minor (Benth.) A. DC. | CACHM |
| Chrysolepis sempervirens | Castanopsis sempervirens (Kellogg) Dudley ex Merriam | CASE8 |
| coast oak | Quercus parvula Greene | QUPA8 |
| coastal live oak | Quercus agrifolia N?e var. oxyadenia (Torr.) J.T. Howell | QUAGO |
| coastal sage scrub oak | Quercus dumosa Nutt. | QUDU |
| coastal sage scrub oak | Quercus dumosa Nutt. var. dumosa | QUDUD |
| coastal sage scrub oak | Quercus dumosa Nutt. var. elegantula Jepson | QUDUE |
| cork oak | Quercus suber L. | QUSU5 |
| Daimyo oak | Quercus dentata Thunb. | QUDE4 |
| Darlington oak | Quercus hemisphaerica Bartr. ex Willd. | QUHE2 |
| Darlington oak | Quercus hemisphaerica Bartr. ex Willd. var. hemisphaerica | QUHEH |
| Darlington oak | Quercus hemisphaerica Bartr. ex Willd. var. maritima (Michx.) Muller | QUHEM |
| Davis Mountain oak | Quercus depressipes Trel. | QUDE3 |
| deer oak | Quercus sadleriana R. Br. | QUSA2 |
| durmast oak | Quercus petraea (Mattuschka) Liebl. | QUPE2 |
| dwarf chinkapin oak | Quercus prinoides Willd. | QUPR |
| dwarf live oak | Quercus minima (Sarg.) Small | QUMI2 |
| dwarf oak | Quercus intricata Trel. | QUIN3 |
| Emory oak | Quercus emoryi Torr. | QUEM |
| Engelmann oak | Quercus engelmannii Greene | QUEN |
| English oak | Quercus robur L. | QURO2 |
| European beech | Fagus sylvatica L. | FASY |
| European chestnut | Castanea sativa P. Mill. | CASA27 |
| European turkey oak | Quercus cerris L. | QUCE |
| Fagus grandifolia | Fagus americana Sweet | FAAM |
| Fagus grandifolia | Fagus ferruginea Aiton | FAFE |
| Fagus grandifolia | Fagus grandifolia Ehrh. ssp. heterophylla Camp | FAGRH |
| Fagus grandifolia | Fagus grandifolia Ehrh. var. caroliniana (Loud.) Fern. & Rehd. | FAGRC |
| Fagus sylvatica | Fagus sylvatica L. var. atropunicea Weston | FASYA |
| false sand post oak | Quercus ?pseudomargarettiae Trel. (pro sp.) [margarettiae ? stellata] | QUPS |
| Gambel oak | Quercus gambelii Nutt. | QUGA |
| Gambel oak | Quercus gambelii Nutt. var. bonina Welsh | QUGAB2 |
| Gambel oak | Quercus gambelii Nutt. var. gambelii | QUGAG |
| Georgia oak | Quercus georgiana M.A. Curtis | QUGE |
| giant chinquapin | Chrysolepis chrysophylla (Dougl. ex Hook.) Hjelmqvist | CHCH7 |
| giant chinquapin | Chrysolepis chrysophylla (Dougl. ex Hook.) Hjelmqvist var. chrysophylla | CHCHC4 |
| giant chinquapin | Chrysolepis chrysophylla (Dougl. ex Hook.) Hjelmqvist var. minor (Benth.) Munz | CHCHM |
| gray oak | Quercus grisea Liebm. | QUGR3 |
| Havard oak | Quercus havardii Rydb. | QUHA3 |
| Havard oak | Quercus havardii Rydb. var. havardii | QUHAH |
| Havard oak | Quercus havardii Rydb. var. tuckeri Welsh | QUHAT |
| Hinckley oak | Quercus hinckleyi C.H. Muller | QUHI |
| holly oak | Quercus ilex L. | QUIL2 |
| huckleberry oak | Quercus vacciniifolia Kellogg | QUVA |
| interior live oak | Quercus wislizeni A. DC. | QUWI2 |
| interior live oak | Quercus wislizeni A. DC. var. frutescens Engelm. | QUWIF |
| interior live oak | Quercus wislizeni A. DC. var. wislizeni | QUWIW |
| island live oak | Quercus tomentella Engelm. | QUTO |
| Italian oak | Quercus frainetto Ten. | QUFR |
| Japanese chestnut | Castanea crenata Sieb. & Zucc. | CACR27 |
| Lacey oak | Quercus laceyi Small | QULA |
| lateleaf oak | Quercus tardifolia C.H. Muller | QUTA |
| laurel oak | Quercus laurifolia Michx. | QULA3 |
| leather oak | Quercus durata Jepson | QUDU4 |
| leather oak | Quercus durata Jepson var. durata | QUDUD2 |
| leather oak | Quercus durata Jepson var. gabrielensis Nixon & C.H. Muller | QUDUG |
| live oak | Quercus virginiana P. Mill. | QUVI |
| MacDonald oak | Quercus ?macdonaldii Greene & Kellogg (pro sp.) [berberidifolia ? lobata] | QUMA4 |
| mapleleaf oak | Quercus acerifolia (Palmer) Stoynoff & Hess | QUAC2 |
| Mexican blue oak | Quercus oblongifolia Torr. | QUOB |
| Mexican oak | Quercus carmenensis C.H. Muller | QUCA7 |
| Mohr oak | Quercus mohriana Buckl. ex Rydb. | QUMO |
| mongolian oak | Quercus mongolica Fisch. ex Ledeb. | QUMO5 |
| Muller oak | Quercus cornelius-mulleri Nixon & Steele | QUCO7 |
| myrtle oak | Quercus myrtifolia Willd. | QUMY |
| netleaf oak | Quercus rugosa N | QURU4 |
| netleaf white oak | Quercus polymorpha Schlecht. & Cham. | QUPO2 |
| northern pin oak | Quercus ellipsoidalis E.J. Hill | QUEL |
| northern red oak | Quercus rubra L. | QURU |
| northern red oak | Quercus rubra L. var. ambigua (Gray) Fern. | QURUA |
| northern red oak | Quercus rubra L. var. rubra | QURUR |
| oak | Quercus L. | QUERC |
| oak | Quercus macrolepis Kotschy | QUMA5 |
| Oglethorpe oak | Quercus oglethorpensis Duncan | QUOG |
| oracle oak | Quercus ?moreha Kellogg (pro sp.) [kelloggii ? wislizeni] | QUMO2 |
| Oregon white oak | Quercus garryana Dougl. ex Hook. | QUGA4 |
| Oregon white oak | Quercus garryana Dougl. ex Hook. var. fruticosa (Engelm.) Govaerts | QUGAF |
| Oregon white oak | Quercus garryana Dougl. ex Hook. var. garryana | QUGAG2 |
| Oregon white oak | Quercus garryana Dougl. ex Hook. var. semota Jepson | QUGAS |
| overcup oak | Quercus lyrata Walt. | QULY |
| Ozark chinkapin | Castanea pumila (L.) P. Mill. var. ozarkensis (Ashe) Tucker | CAPUO |
| Palmer oak | Quercus palmeri Engelm. | QUPA10 |
| pin oak | Quercus palustris Muenchh. | QUPA2 |
| plateau oak | Quercus fusiformis Small | QUFU |
| post oak | Quercus stellata Wangenh. | QUST |
| pungent oak | Quercus pungens Liebm. | QUPU |
| Quercus ?alvordiana | Quercus dumosa Nutt. var. alvordiana (Eastw.) Jepson | QUDUA2 |
| Quercus ?ashei | Quercus ?asheana Little | QUAS4 |
| Quercus ?atlantica | Quercus ?sublaurifolia Trel. ex Palmer | QUSU9 |
| Quercus ?cravenensis | Quercus ?carolinensis Trel. | QUCA9 |
| Quercus ?deamii | Quercus ?fallax Palmer | QUFA4 |
| Quercus ?egglestonii | Quercus ?shirlingii Bush ex Palmer & Steyermark | QUSH2 |
| Quercus ?fernaldii | Quercus ?lowellii Sarg. | QULO3 |
| Quercus ?filialis | Quercus ?dubia Trel. | QUDU5 |
| Quercus ?filialis | Quercus ?inaequalis Palmer & Steyermark | QUIN9 |
| Quercus ?ganderi | Quercus ?chasei McMinn, Babcock & Righter | QUCH3 |
| Quercus ?hawkinsiae | Quercus ?porteri Trel. | QUPO3 |
| Quercus ?inconstans | Quercus livermorensis C.H. Muller | QULI |
| Quercus ?macdonaldii | Quercus dumosa Nutt. var. macdonaldii (Greene & Kellogg) Jepson | QUDUM2 |
| Quercus ?macnabiana | Quercus ?mahlonii Palmer | QUMA7 |
| Quercus ?palmeriana | Quercus ?anceps Palmer | QUAN2 |
| Quercus ?pauciloba | Quercus ?andrewsii Sarg. | QUAN3 |
| Quercus ?pauciloba | Quercus fendleri Liebm. | QUFE5 |
| Quercus ?pauciloba | Quercus undulata Torr. | QUUN |
| Quercus ?pauciloba | Quercus venustula Greene | QUVE3 |
| Quercus ?rudkinii | Quercus ?dubia Ashe | QUDU6 |
| Quercus ?schuettei | Quercus ?hillii Trel. | QUHI3 |
| Quercus ?subintegra | Quercus falcata Michx. var. subintegra Engelm. | QUFAS |
| Quercus ?townei | Quercus ?kinselae (C.H. Muller) Nixon & C.H. Muller | QUKI |
| Quercus ?townei | Quercus dumosa Nutt. var. kinselae C.H. Muller | QUDUK |
| Quercus ?willdenowiana | Quercus ?pinetorum Moldenke | QUPI |
| Quercus acerifolia | Quercus shumardii Buckl. var. acerifolia Palmer | QUSHA |
| Quercus agrifolia var. agrifolia | Quercus pricei Sudworth | QUPR3 |
| Quercus ajoensis | Quercus turbinella Greene ssp. ajoensis (C.H. Muller) Felger & Lowe | QUTUA2 |
| Quercus ajoensis | Quercus turbinella Greene var. ajoensis (C.H. Muller) Little | QUTUA |
| Quercus alba | Quercus alba L. var. subcaerulea A.L. & M.C. Pickens | QUALS |
| Quercus alba | Quercus alba L. var. subflavea A.L. & M.C. Pickens | QUALS2 |
| Quercus arkansana | Quercus caput-rivuli Ashe | QUCA8 |
| Quercus boyntonii | Quercus stellata Wangenh. var. boyntonii (Beadle) Sarg. | QUSTB |
| Quercus brantii | Quercus persica Jaub. & Spach | QUPE3 |
| Quercus buckleyi | Quercus texana auct. non Buckl. [misapplied] | QUTE2 |
| Quercus chrysolepis var. chrysolepis | Quercus wilcoxii Rydb. | QUWI5 |
| Quercus coccinea var. coccinea | Quercus ?richteri Baenitz | QURI3 |
| Quercus falcata | Quercus falcata Michx. var. triloba (Michx.) Nutt. | QUFAT |
| Quercus falcata | Quercus triloba Michx. | QUTR3 |
| Quercus frainetto | Quercus conferta Kit. | QUCO6 |
| Quercus fusiformis | Quercus virginiana P. Mill. var. fusiformis (Small) Sarg. | QUVIF |
| Quercus gambelii var. gambelii | Quercus eastwoodiae Rydb. | QUEA |
| Quercus gambelii var. gambelii | Quercus gunnisonii (Torr. & Gray) Rydb. | QUGU3 |
| Quercus gambelii var. gambelii | Quercus leptophylla Rydb. | QULE3 |
| Quercus gambelii var. gambelii | Quercus nitescens Rydb. | QUNI2 |
| Quercus gambelii var. gambelii | Quercus novomexicana (A. DC.) Rydb. | QUNO |
| Quercus gambelii var. gambelii | Quercus submollis Rydb. | QUSU11 |
| Quercus gambelii var. gambelii | Quercus utahensis (A. DC.) Rydb. | QUUT |
| Quercus gambelii var. gambelii | Quercus vreelandii Rydb. | QUVR |
| Quercus garryana var. fruticosa | Quercus breweri Engelm. | QUBR3 |
| Quercus garryana var. fruticosa | Quercus garryana Dougl. ex Hook. var. breweri (Engelm.) Jepson | QUGAB |
| Quercus garryana var. semota | Quercus oerstediana R. Br. | QUOE |
| Quercus geminata | Quercus virginiana P. Mill. var. geminata (Small) Sarg. | QUVIG |
| Quercus geminata | Quercus virginiana P. Mill. var. maritima (Michx.) Sarg. | QUVIM3 |
| Quercus glauca | Quercus myrsinifolia Blume | QUMY2 |
| Quercus hemisphaerica var. maritima | Quercus maritima (Michx.) Willd., non Bartr. | QUMA10 |
| Quercus incana | Quercus cinerea Michx. | QUCI |
| Quercus john-tuckeri | Quercus turbinella Greene ssp. californica Tucker | QUTUC |
| Quercus john-tuckeri | Quercus turbinella Greene var. californica (Tucker) L. Benson | QUTUC2 |
| Quercus kelloggii | Quercus californica (Torr.) Cooper | QUCA11 |
| Quercus laceyi | Quercus glaucoides auct. non Mart. & Gal. [misapplied] | QUGL |
| Quercus laevis | Quercus catesbaei Michx. | QUCA10 |
| Quercus laurifolia | Quercus hemisphaerica auct. non Bartr. ex Willd. [misapplied] | QUHE4 |
| Quercus laurifolia | Quercus obtusa (Willd.) Ashe | QUOB2 |
| Quercus laurifolia | Quercus phellos L. var. laurifolia (Michx.) Chapman | QUPHL |
| Quercus laurifolia | Quercus succulenta Small | QUSU10 |
| Quercus lobata | Quercus hindsii Benth. | QUHI2 |
| Quercus lobata | Quercus lobata N?e var. argillara Jepson | QULOA |
| Quercus lobata | Quercus lobata N?e var. insperata Jepson | QULOI |
| Quercus lobata | Quercus lobata N?e var. turbinata Jepson | QULOT |
| Quercus lobata | Quercus lobata N?e var. walteri Jepson | QULOW |
| Quercus macrocarpa var. depressa | Quercus mandanensis Rydb. | QUMA9 |
| Quercus macrocarpa var. macrocarpa | Quercus macrocarpa Michx. var. oliviformis (Michx. f.) Gray | QUMAO |
| Quercus macrolepis | Quercus aegilops auct. | QUAE |
| Quercus margarettiae | Quercus drummondii Liebm. | QUDR |
| Quercus margarettiae | Quercus stellata Wangenh. var. araniosa Sarg. | QUSTA |
| Quercus margarettiae | Quercus stellata Wangenh. var. margarettiae (Ashe ex Small) Sarg. | QUSTM |
| Quercus marilandica | Quercus nigra L. var. marilandica L. | QUNIM |
| Quercus marilandica var. ashei | Quercus marilandica Muenchh. var. ashii Sudworth [orthographic variant] | QUMAA |
| Quercus marilandica var. ashei | Quercus neoashei Bush | QUNE7 |
| Quercus michauxii | Quercus houstoniana C.H. Muller | QUHO3 |
| Quercus michauxii | Quercus prinus auct. p.p., non L. | QUPR4 |
| Quercus minima | Quercus virginiana P. Mill. var. minima Sarg. | QUVIM2 |
| Quercus muehlenbergii | Quercus acuminata (Michx.) Houba | QUAC |
| Quercus muehlenbergii | Quercus alexanderi Britt. | QUAL4 |
| Quercus muehlenbergii | Quercus prinoides Coult., non Willd. | QUPR5 |
| Quercus muehlenbergii | Quercus prinoides Willd. var. acuminata (Michx.) Gleason | QUPRA |
| Quercus nigra | Quercus microcarya Small | QUMI3 |
| Quercus nigra | Quercus nigra L. var. heterophylla (Ait.) Ashe | QUNIH |
| Quercus pagoda | Quercus falcata Michx. var. leucophylla (Ashe) Palmer & Steyermark | QUFAL |
| Quercus pagoda | Quercus falcata Michx. var. pagodifolia Ell. | QUFAP |
| Quercus pagoda | Quercus pagodifolia (Ell.) Ashe | QUPA11 |
| Quercus palmeri | Quercus chrysolepis Liebm. var. palmeri (Engelm.) Sarg. | QUCHP |
| Quercus palmeri | Quercus dunnii Kellogg | QUDU3 |
| Quercus parvula var. shrevei | Quercus shrevei C.H. Muller | QUSH3 |
| Quercus petraea | Quercus sessiliflora Salisb. | QUSE |
| Quercus prinoides | Quercus prinoides Willd. var. rufescens Rehd. | QUPRR |
| Quercus prinus | Quercus montana Willd. | QUMO4 |
| Quercus robur | Quercus robur L. | QUROF |
| Quercus rubra var. ambigua | Quercus borealis Michx. f. | QUBO |
| Quercus rubra var. ambigua | Quercus rubra L. var. borealis (Michx. f.) Farw. | QURUB |
| Quercus rubra var. rubra | Quercus borealis Michx. f. var. maxima (Marsh.) Ashe | QUBOM |
| Quercus rubra var. rubra | Quercus maxima (Marsh.) Ashe | QUMA8 |
| Quercus rugosa | Quercus diversicolor Trel. | QUDI5 |
| Quercus rugosa | Quercus reticulata Humb. & Bonpl. | QURE3 |
| Quercus shumardii var. schneckii | Quercus schneckii Britt. | QUSC5 |
| Quercus similis | Quercus ashei Sterrett | QUAS2 |
| Quercus similis | Quercus mississippiensis Ashe | QUMI4 |
| Quercus similis | Quercus stellata Wangenh. var. mississippiensis (Ashe) Little | QUSTM3 |
| Quercus similis | Quercus stellata Wangenh. var. paludosa Sarg. | QUSTP |
| Quercus sinuata var. breviloba | Quercus annulata Buckl. | QUAN4 |
| Quercus sinuata var. breviloba | Quercus breviloba (Torr.) Sarg. | QUBR4 |
| Quercus sinuata var. breviloba | Quercus durandii Buckl. var. breviloba (Torr.) Palmer | QUDUB |
| Quercus sinuata var. breviloba | Quercus san-sabeana Buckl. | QUSA7 |
| Quercus sinuata var. breviloba | Quercus sinuata Walt. var. san-sabeana (Buckl.) Buckl. | QUSIS2 |
| Quercus sinuata var. sinuata | Quercus durandii Buckl. | QUDU2 |
| Quercus stellata | Quercus stellata Wangenh. var. attenuata Sarg. | QUSTA2 |
| Quercus stellata | Quercus stellata Wangenh. var. parviloba Sarg. | QUSTP2 |
| Quercus texana | Quercus nuttallii Palmer | QUNU |
| Quercus texana | Quercus nuttallii Palmer var. cachensis Palmer | QUNUC |
| Quercus texana | Quercus rubra L. var. texana (Buckl.) Buckl. | QURUT |
| Quercus texana | Quercus shumardii Buckl. var. microcarpa (Torr.) Shinners | QUSHM |
| Quercus texana | Quercus shumardii Buckl. var. texana (Buckl.) Ashe | QUSHT |
| Quercus turbinella | Quercus dumosa Nutt. var. turbinella (Greene) Jepson | QUDUT |
| Quercus variabilis | Quercus chinensis Bunge [excluded] | QUCH6 |
| Quercus vaseyana | Quercus pungens Liebm. var. vaseyana (Buckl.) C.H. Muller | QUPUV |
| Quercus velutina | Quercus velutina Lam. var. missouriensis Sarg. | QUVEM |
| ring-cup oak | Quercus glauca Thunb. | QUGL2 |
| robust oak | Quercus robusta C.H. Muller | QURO3 |
| runner oak | Quercus margarettiae Ashe ex Small | QUMA6 |
| running oak | Quercus pumila Walt. | QUPU80 |
| sand live oak | Quercus geminata Small | QUGE2 |
| sandhill oak | Quercus inopina Ashe | QUIN7 |
| sandpaper oak | Quercus vaseyana Buckl. | QUVA5 |
| Santa Cruz Island oak | Quercus parvula Greene var. parvula | QUPAP2 |
| sawtooth oak | Quercus acutissima Carruthers | QUAC80 |
| scarlet oak | Quercus coccinea Muenchh. | QUCO2 |
| scarlet oak | Quercus coccinea Muenchh. var. coccinea | QUCOC |
| scarlet oak | Quercus coccinea Muenchh. var. tuberculata Sarg. | QUCOT |
| Schneck oak | Quercus shumardii Buckl. var. schneckii (Britt.) Sarg. | QUSHS |
| scrub oak | Quercus berberidifolia Liebm. | QUBE5 |
| shingle oak | Quercus imbricaria Michx. | QUIM |
| Shreve oak | Quercus parvula Greene var. shrevei (C.H. Muller) Nixon | QUPAS2 |
| Shumard oak | Quercus shumardii Buckl. var. shumardii | QUSHS2 |
| Shumard oak | Quercus shumardii Buckl. var. stenocarpa Laughlin | QUSHS3 |
| Shumard's oak | Quercus shumardii Buckl. | QUSH |
| silverleaf oak | Quercus hypoleucoides A. Camus | QUHY |
| Sonoran oak | Quercus viminea Trel. | QUVI2 |
| Sonoran scrub oak | Quercus turbinella Greene | QUTU2 |
| southern red oak | Quercus falcata Michx. | QUFA |
| swamp chestnut oak | Quercus michauxii Nutt. | QUMI |
| swamp white oak | Quercus bicolor Willd. | QUBI |
| Tamalpais oak | Quercus parvula Greene var. tamalpaisensis S.K. Langer | QUPAT |
| tanoak | Lithocarpus Blume | LITHO |
| tanoak | Lithocarpus densiflorus (Hook. & Arn.) Rehd. | LIDE3 |
| tanoak | Lithocarpus densiflorus (Hook. & Arn.) Rehd. var. densiflorus | LIDED2 |
| tanoak | Lithocarpus densiflorus (Hook. & Arn.) Rehd. var. echinoides (R. Br.) Abrams | LIDEE |
| Texas red oak | Quercus texana Buckl. | QUTE |
| Toumey oak | Quercus toumeyi Sarg. | QUTO2 |
| Tucker oak | Quercus john-tuckeri Nixon & C.H. Muller | QUJO3 |
| turkey oak | Quercus laevis Walt. | QULA2 |
| valley oak | Quercus lobata N | QULO |
| water oak | Quercus nigra L. | QUNI |
| white oak | Quercus alba L. | QUAL |
| willow oak | Quercus phellos L. | QUPH |