| Symbol | Scientific name | Common name/Accepted name (for synonyms) | Family |
| QUFO | Quercus ×fontana Laughlin | | Fagaceae
|
| QUFR | Quercus frainetto Ten. | Italian oak | Fagaceae
|
| QUFU | Quercus fusiformis Small | plateau oak | Fagaceae
|
| QUGAB2 | Quercus gambelii Nutt. var. bonina Welsh | Gambel oak | Fagaceae
|
| QUGAG | Quercus gambelii Nutt. var. gambelii | Gambel oak | Fagaceae
|
| QUGA | Quercus gambelii Nutt. | Gambel oak | Fagaceae
|
| QUGA2 | Quercus ×ganderi C.B. Wolf | | Fagaceae
|
| QUGA3 | Quercus ×garlandensis Palmer | | Fagaceae
|
| QUGAB | Quercus garryana Dougl. ex Hook. var. breweri (Engelm.) Jepson | Oregon white oak | Fagaceae
|
| QUGAG2 | Quercus garryana Dougl. ex Hook. var. garryana | Oregon white oak | Fagaceae
|
| QUGAS | Quercus garryana Dougl. ex Hook. var. semota Jepson | Oregon white oak | Fagaceae
|
| QUGA4 | Quercus garryana Dougl. ex Hook. | Oregon white oak | Fagaceae
|
| QUGE2 | Quercus geminata Small | sand live oak | Fagaceae
|
| QUGE | Quercus georgiana M.A. Curtis | Georgia oak | Fagaceae
|
| QUGI | Quercus ×giffordii Trel. | | Fagaceae
|
| QUGL | Quercus glaucoides auct. non Mart. & Gal. | Quercus laceyi | Fagaceae
|
| QUGR | Quercus graciliformis C.H. Muller | Chisos oak | Fagaceae
|
| QUGR4 | Quercus ×grandidentata Ewan (pro sp.) | | Fagaceae
|
| QUGR2 | Quercus gravesii Sudworth | Chisos red oak | Fagaceae
|
| QUGR3 | Quercus grisea Liebm. | gray oak | Fagaceae
|
| QUGU | Quercus ×guadalupensis Sarg. | | Fagaceae
|
| QUGU3 | Quercus gunnisonii (Torr. & Gray) Rydb. | Quercus gambelii var. gambelii | Fagaceae
|
| QUHA | Quercus ×harbisonii Sarg. | | Fagaceae
|
| QUHA2 | Quercus ×hastingsii Sarg. | | Fagaceae
|
| QUHAH | Quercus havardii Rydb. var. havardii | Havard oak | Fagaceae
|
| QUHAT | Quercus havardii Rydb. var. tuckeri Welsh | Havard oak | Fagaceae
|
| QUHA3 | Quercus havardii Rydb. | Havard oak | Fagaceae
|
| QUHA4 | Quercus ×hawkinsiae Sudworth | | Fagaceae
|
| QUHEH | Quercus hemisphaerica Bartr. ex Willd. var. hemisphaerica | Darlington oak | Fagaceae
|
| QUHEM | Quercus hemisphaerica Bartr. ex Willd. var. maritima (Michx.) Muller | Darlington oak | Fagaceae
|
| QUHE2 | Quercus hemisphaerica Bartr. ex Willd. | Darlington oak | Fagaceae
|
| QUHE4 | Quercus hemisphaerica auct. non Bartr. ex Willd. | Quercus laurifolia | Fagaceae
|
| QUHE | Quercus ×heterophylla Michx. f. (pro sp.) | | Fagaceae
|
| QUHI3 | Quercus ×hillii Trel. | Quercus schuettei | Fagaceae
|
| QUHI | Quercus hinckleyi C.H. Muller | Hinckley oak | Fagaceae
|
| QUHI2 | Quercus hindsii Benth. | Quercus lobata | Fagaceae
|
| QUHO3 | Quercus houstoniana C.H. Muller | Quercus michauxii | Fagaceae
|
| QUHO | Quercus ×howellii Tucker | | Fagaceae
|
| QUHU | Quercus ×humidicola Palmer | | Fagaceae
|
| QUHY | Quercus hypoleucoides A. Camus | silverleaf oak | Fagaceae
|
| QUIL2 | Quercus ilex L. | holly oak | Fagaceae
|
| QUIL | Quercus ilicifolia Wangenh. | bear oak | Fagaceae
|
| QUIM | Quercus imbricaria Michx. | shingle oak | Fagaceae
|
| QUIN9 | Quercus ×inaequalis Palmer & Steyermark | Quercus filialis | Fagaceae
|
| QUIN | Quercus incana Bartr. | bluejack oak | Fagaceae
|
| QUIN5 | Quercus ×incomita Palmer | | Fagaceae
|
| QUIN2 | Quercus ×inconstans Palmer | | Fagaceae
|
| QUIN6 | Quercus infectoria Olivier | aleppo oak | Fagaceae
|
| QUIN7 | Quercus inopina Ashe | sandhill oak | Fagaceae
|
| QUIN3 | Quercus intricata Trel. | dwarf oak | Fagaceae
|
| QUIN4 | Quercus ×introgressa P.M. Thompson | | Fagaceae
|
| QUJA | Quercus ×jackiana Schneid. | | Fagaceae
|
| QUJO3 | Quercus john-tuckeri Nixon & C.H. Muller | Tucker oak | Fagaceae
|
| QUJO | Quercus ×jolonensis Sarg. | | Fagaceae
|
| QUJO4 | Quercus ×joorii Trel. | | Fagaceae
|
| QUKE | Quercus kelloggii Newberry | California black oak | Fagaceae
|
| QUKI | Quercus ×kinselae (C.H. Muller) Nixon & C.H. Muller | Quercus townei | Fagaceae
|
| QULA | Quercus laceyi Small | Lacey oak | Fagaceae
|
| QULA2 | Quercus laevis Walt. | turkey oak | Fagaceae
|
| QULA3 | Quercus laurifolia Michx. | laurel oak | Fagaceae
|
| QULE | Quercus ×leana Nutt. (pro sp.) | | Fagaceae
|
| QULE3 | Quercus leptophylla Rydb. | Quercus gambelii var. gambelii | Fagaceae
|
| QULI | Quercus livermorensis C.H. Muller | Quercus inconstans | Fagaceae
|
| QULOA | Quercus lobata Née var. argillara Jepson | Quercus lobata | Fagaceae
|
| QULOI | Quercus lobata Née var. insperata Jepson | Quercus lobata | Fagaceae
|
| QULOT | Quercus lobata Née var. turbinata Jepson | Quercus lobata | Fagaceae
|
| QULOW | Quercus lobata Née var. walteri Jepson | Quercus lobata | Fagaceae
|
| QULO | Quercus lobata Née | California white oak | Fagaceae
|
| QULO3 | Quercus ×lowellii Sarg. | Quercus fernaldii | Fagaceae
|
| QULU | Quercus ×ludoviciana Sarg. | | Fagaceae
|
| QULY | Quercus lyrata Walt. | overcup oak | Fagaceae
|
| QUMA4 | Quercus ×macdonaldii Greene (pro sp.) | MacDonald oak | Fagaceae
|
| QUMA | Quercus ×macnabiana Sudworth | | Fagaceae
|
| QUMAD | Quercus macrocarpa Michx. var. depressa (Nutt.) Engelm. | bur oak | Fagaceae
|
| QUMAM | Quercus macrocarpa Michx. var. macrocarpa | bur oak | Fagaceae
|
| QUMAO | Quercus macrocarpa Michx. var. oliviformis (Michx. f.) Gray | Quercus macrocarpa var. macrocarpa | Fagaceae
|
| QUMA2 | Quercus macrocarpa Michx. | bur oak | Fagaceae
|
| QUMA5 | Quercus macrolepis Kotschy | oak | Fagaceae
|
| QUMA7 | Quercus ×mahlonii Palmer | Quercus macnabiana | Fagaceae
|
| QUMA9 | Quercus mandanensis Rydb. | Quercus macrocarpa var. macrocarpa | Fagaceae
|
| QUMA6 | Quercus margarettiae Ashe ex Small | runner oak | Fagaceae
|
| QUMAA | Quercus marilandica Muenchh. var. ashii Sudworth | blackjack oak | Fagaceae
|
| QUMAM2 | Quercus marilandica Muenchh. var. marilandica | blackjack oak | Fagaceae
|
| QUMA3 | Quercus marilandica Muenchh. | blackjack oak | Fagaceae
|
| QUMA10 | Quercus maritima (Michx.) Willd., non Bartr. | Quercus hemisphaerica var. maritima | Fagaceae
|
| QUMA8 | Quercus maxima (Marsh.) Ashe | Quercus rubra var. rubra | Fagaceae
|
| QUME2 | Quercus ×megaleia Laughlin | | Fagaceae
|
| QUME | Quercus ×mellichampii Trel. ex Sarg. | | Fagaceae
|
| QUMI | Quercus michauxii Nutt. | swamp chestnut oak | Fagaceae
|
| QUMI3 | Quercus microcarya Small | Quercus nigra | Fagaceae
|
| QUMI2 | Quercus minima (Sarg.) Small | dwarf live oak | Fagaceae
|
| QUMI4 | Quercus mississippiensis Ashe | Quercus similis | Fagaceae
|
| QUMO | Quercus mohriana Buckl. ex Rydb. | Mohr oak | Fagaceae
|
| QUMO5 | Quercus mongolica Fisch. ex Ledeb. | Mongolian oak | Fagaceae
|
| QUMO4 | Quercus montana Willd. | Quercus prinus | Fagaceae
|
| QUMO2 | Quercus ×moreha Kellogg (pro sp.) | oracle oak | Fagaceae
|
| QUMO3 | Quercus ×moultonensis Ashe (pro sp.) | | Fagaceae
|
| QUMU | Quercus muehlenbergii Engelm. | chinkapin oak | Fagaceae
|
| QUMU3 | Quercus ×munzii Tucker | | Fagaceae
|
| QUMU2 | Quercus ×mutabilis Palmer & Steyermark | | Fagaceae
|
| QUMY | Quercus myrtifolia Willd. | myrtle oak | Fagaceae
|