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Quercus macrocarpa Michx.
BUR OAK
Life   Plantae   Dicotyledoneae   Fagaceae   Quercus

Quercus macrocarpa, whole tree or vine - general
© Copyright Steve Baskauf, 2002-2011 · 4
Quercus macrocarpa, whole tree or vine - general

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Quercus macrocarpa, bark - of a large tree
© Copyright Steve Baskauf, 2002-2011 · 4
Quercus macrocarpa, bark - of a large tree
Quercus macrocarpa, whole tree or vine - view up trunk
© Copyright Steve Baskauf, 2002-2011 · 4
Quercus macrocarpa, whole tree or vine - view up trunk
Quercus macrocarpa, leaf - showing orientation on twig
© Copyright Steve Baskauf, 2002-2011 · 4
Quercus macrocarpa, leaf - showing orientation on twig

Quercus macrocarpa, leaf - whole upper surface
© Copyright Steve Baskauf, 2002-2011 · 4
Quercus macrocarpa, leaf - whole upper surface
Quercus macrocarpa, leaf - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Quercus macrocarpa, leaf - unspecified
Quercus macrocarpa, leaf - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Quercus macrocarpa, leaf - unspecified

Quercus macrocarpa, fruit - as borne on the plant
© Copyright Steve Baskauf, 2002-2011 · 4
Quercus macrocarpa, fruit - as borne on the plant
Quercus macrocarpa, twig - orientation of petioles
© Copyright Steve Baskauf, 2002-2011 · 4
Quercus macrocarpa, twig - orientation of petioles
Quercus macrocarpa, leaf - margin of upper + lower surface
© Copyright Steve Baskauf, 2002-2011 · 4
Quercus macrocarpa, leaf - margin of upper + lower surface

Quercus macrocarpa, inflorescence - whole - unspecified
© Copyright Steve Baskauf, 2002-2011 · 4
Quercus macrocarpa, inflorescence - whole - unspecified
Quercus macrocarpa, inflorescence - whole - male
© Copyright Steve Baskauf, 2002-2011 · 4
Quercus macrocarpa, inflorescence - whole - male
Quercus macrocarpa, inflorescence - whole - female
© Copyright Steve Baskauf, 2002-2011 · 4
Quercus macrocarpa, inflorescence - whole - female

Quercus macrocarpa, whole tree or vine - general
© Copyright Steve Baskauf, 2002-2011 · 4
Quercus macrocarpa, whole tree or vine - general
Quercus macrocarpa, whole tree or vine - view up trunk
© Copyright Steve Baskauf, 2002-2011 · 4
Quercus macrocarpa, whole tree or vine - view up trunk

Associates · map
FamilyScientific name @ source (records)
Agaricaceae  Phoma glandicola @ BPI (1)
Amphisphaeriaceae  Pestalotia kansensis @ BPI (7)
Aphididae  Myzocallis ( @ CSUC_TCN (8); CSCA_TCN (2); AMNH_PBI (12); NCSU (5)

Neosymydobius albasiphus @ CSUC_TCN (1)
Botryosphaeriaceae  Fusicoccum quercus @ BPI (2)

Phyllosticta livida @ BPI (6)

Phyllosticta phomiformis @ BPI (4)

Phyllosticta quercus @ BPI (2)
Chionosphaeraceae  Chionosphaera apobasidialis @ BPI (1)
Chlamydomonadaceae  Sphaerella spleniata @ BPI (2)
Cicadellidae  Alebra aurea @ MEMU_ENT (1)

Chlorotettix ( @ MEMU_ENT (1)

Empoasca fabae @ III (1)

Erasmoneura vulnerata @ III (1)

Eratoneura acantha @ III (1)

Eratoneura accola @ III (1)

Eratoneura adunca @ III (1)

Eratoneura affinis @ III (4)

Eratoneura ardens @ III (1)

Eratoneura basilaris @ III (4)

Eratoneura bigemina @ III (6)

Eratoneura brevipes @ III (8)

Eratoneura campora @ III (3)

Eratoneura carmini @ III (57)

Eratoneura curta @ NCSU (1); III (1)

Eratoneura curvata @ III (21)

Eratoneura externa @ III (2)

Eratoneura fergersoni @ III (3)

Eratoneura forfex @ III (2)

Eratoneura gemina @ III (2)

Eratoneura gilesi @ III (3)

Eratoneura guicei @ III (22); AMNH_IZC (1); NCSU (1)

Eratoneura haysensis @ AMNH_IZC (1); III (19); NCSU (1)

Eratoneura hymac @ III (3)

Eratoneura imbricariae @ III (1)

Eratoneura impar @ III (4)

Eratoneura inepta @ III (2)

Eratoneura ligata @ III (10)

Eratoneura lucyae @ NCSU (1); III (2)

Eratoneura macra @ III (1)

Eratoneura maculata @ III (1)

Eratoneura maga @ III (1)

Eratoneura manus @ III (2)

Eratoneura millsi @ III (4)

Eratoneura minor @ III (1)

Eratoneura mirifica @ III (2)

Eratoneura osborni @ III (2)

Eratoneura parva @ III (3)

Eratoneura patris @ III (1)

Eratoneura penesica @ III (2)

Eratoneura prolixa @ III (15)

Eratoneura propria @ III (4)

Eratoneura restricta @ III (1)

Eratoneura richardsi @ III (1)

Eratoneura solita @ III (3)

Eratoneura stannardi @ NCSU (1)

Eratoneura stephensoni @ III (1)

Eratoneura tammina @ III (1)

Eratoneura tantilla @ III (8)

Eratoneura teres @ III (2)

Erythridula clavata @ III (1)

Erythridula cornipes @ III (1)

Erythridula fulvocephala @ III (1)

Erythridula kanza @ III (3)

Erythridula minuta @ III (2)

Erythridula noeva @ III (2)

Erythridula obliqua @ III (3)

Erythridula parvispicata @ III (1)

Erythridula tenuispica @ III (1)

Erythridula tridens @ III (1)

Erythridula unicuspidis @ III (1)

Erythroneura delicata @ III (1)

Erythroneura rubra @ III (1)

Erythroneura vitis @ III (2)

Paraphlepsius irroratus @ UKYL_TCN (1)

Paraphlepsius @ MEMU_ENT (1)

Typhlocyba @ MEMU_ENT (1)
Coccodiniaceae  Coccodinium bartschii @ BPI (1)
Corticiaceae  Corticium litschaueri @ BPI (1)

Corticium oakesii @ BPI (1)

Corticium subinvisibile @ BPI (1)
Cronartiaceae  Cronartium asclepiadeum @ BPI (1)

Cronartium californicum @ BPI (4)

Cronartium cerebrum @ BPI (26)

Cronartium conigenum @ BPI (4)

Cronartium fusiforme @ BPI (23)

Cronartium meineckii @ BPI (5)

Cronartium quercuum @ BPI (5)

Cronartium strobilinum @ BPI (22)
Davidiellaceae  Cladosporium epiphyllum @ BPI (3)
Dermateaceae  Gloeosporium canadense @ BPI (2)

Gloeosporium martinii @ BPI (1)

Marssonina martinii @ BPI (15)

Marssonina quercina @ BPI (4)
Diaporthaceae  Diaporthe taleola @ BPI (1)
Diatrypaceae  Diatrype americana @ BPI (1)

Diatrype platystoma @ BPI (1)

Eutypa aspera @ BPI (1)

Eutypa lata @ BPI (2)
Elsinoaceae  Sphaceloma @ BPI (1)
Erysiphaceae  Microsphaera alni @ BPI (9)

Microsphaera quercina @ BPI (6)

Phyllactinia corylea @ BPI (4)

Phyllactinia suffulta @ BPI (1)

Sphaerotheca lanestris @ BPI (4)
Fomitopsidaceae  Daedalea confragosa @ BPI (1)
Gnomoniaceae  Gnomonia setacea @ BPI (2)

Gnomonia veneta @ BPI (1)
Hymenochaetaceae  Hymenochaete curtisii @ BPI (6)

Hymenochaete rubiginosa @ BPI (1)
Hyponectriaceae  Physalospora quercifolia @ BPI (1)
Hysteriaceae  Hysterographium kansense @ BPI (7)
Kermesidae  Nanokermes pubescens @ CSCA_TCN (2)
Membracidae  Atymna helena @ UDCC_NRI (16)

Atymna querci @ UDCC_NRI (3)

Cyrtolobus dixianus @ UDCC_TCN (1)

Cyrtolobus fenestratus @ UDCC_NRI (1)

Cyrtolobus fuliginosus @ UDCC_NRI (1)

Cyrtolobus fuscipennis @ UDCC_NRI (2)

Cyrtolobus griseus @ UDCC_NRI (22); AMNH_ENT (6)

Cyrtolobus inermis @ UDCC_NRI (1)

Cyrtolobus maculifrontis @ UDCC_NRI (17); UDCC_TCN (6)

Cyrtolobus pallidifrontis @ UDCC_NRI (2)

Cyrtolobus pulchellus @ UDCC_NRI (3)

Cyrtolobus tuberosus @ UDCC_NRI (1); UDCC_TCN (1)

Heliria molaris @ UDCC_TCN (1)

Ophiderma definita @ UDCC_NRI (1)

Telamona monticola @ UDCC_TCN (1)

Telamona spreta @ UDCC_TCN (3)

Telamona tiliae @ UDCC_TCN (1)

Telamona westcotti @ UDCC_TCN (4)

Xantholobus muticus @ UDCC_TCN (10)
Meruliaceae  Merulius corium @ BPI (1)
Miridae  Americodema nigrolineatum @ AMNH_PBI (21)

Blepharidopterus provancheri @ AMNH_PBI (1)

Ceratocapsus modestus @ AMNH_PBI (1)

Ceratocapsus pilosulus @ AMNH_PBI (4)

Lopidea @ MEMU_ENT (1)

Noctuocoris fumidus @ AMNH_PBI (1)

Paraproba capitata @ AMNH_PBI (1)

Phytocoris brooksi @ AMNH_PBI (10)

Pilophorus vicarius @ AMNH_PBI (3)

Reuteria querci @ AMNH_PBI (7)

Schaffneria davisi @ AMNH_PBI (1)

Trigonotylus caelestialium @ AMNH_PBI (1)
Mycosphaerellaceae  Mycosphaerella spleniata @ BPI (5); 609693A (1); 609693B (1)

Septoria quercicola @ BPI (1)
Nidulariaceae  Crucibulum vulgare @ BPI (1)
Polyporaceae  Fomes everhartii @ BPI (1)

Fomes fraxinophilus @ BPI (2)

Fomes gilvus @ BPI (1)

Fomes ohiensis @ BPI (3)

Polyporus dryophilus @ BPI (1)

Polyporus gilvus @ BPI (6)

Polyporus obtusus @ BPI (1)

Polyporus pubescens @ BPI (1)

Polyporus versicolor @ BPI (1)

Polyporus @ BPI (1)

Poria callosa @ BPI (1)

Poria @ BPI (2)

Pycnoporus cinnabarinus @ BPI (1)
Rhynchostomataceae  Rhynchostoma sphaerincola @ BPI (1)
Sarcosomataceae  Strumella coryneoidea @ BPI (7)

Urnula craterium @ BPI (2)
Schizophyllaceae  Schizophyllum commune @ BPI (1)
Steccherinaceae  Irpex cinnamomeus @ BPI (1)

Irpex flavus @ BPI (1)

Irpex ravenelii @ BPI (2)
Stereaceae  Aleurodiscus griseocanus @ BPI (1)

Aleurodiscus oakesii @ BPI (2)

Stereum frustulatum @ BPI (1)

Stereum gausapatum @ BPI (4)
Taphrinaceae  Taphrina caerulescens @ BPI (7)
Teichosporaceae  Teichospora obducens @ BPI (2)
Tingidae  Corythucha ciliata @ MEMU_ENT (2)
Tremellaceae  Tremella subanomala @ BPI (1)
Tricholomataceae  Helotium fructigenum @ BPI (1)
Tubeufiaceae  Helicosporium lumbricoides @ BPI (1)
Valsaceae  Valsa lata @ BPI (1)

Valsa macrocarpa @ BPI (1)
Xylariaceae  Daldinia vernicosa @ BPI (1)

Daldinia @ BPI (1)

Hypoxylon mediterraneum @ BPI (2)
_  Actinopelte dryina @ BPI (3)

Ambrosiella brunnea @ BPI (1)

Ascomycetella @ BPI (3)

Catenuloxyphium semiovatum @ BPI (1)

Ceratophorum uncinatum @ BPI (4)

Sporidesmium toruloides @ BPI (1)

Sporidesmium versisporum @ BPI (1)

unknown unknown @ AMNH_PBI (1)

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Following modified from US Forest Service
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Following modified from Virginia Tech Dendrology
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&pull 20q v5.145 20180528: Error 500 Can't connect to www.cnr.vt.edu:80 http://www.cnr.vt.edu/dendro/dendrology/syllabus/qmacrocarpa.htm

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You are here: Home / Plant Profile

Quercus macrocarpa Michx.
bur oak

Image of Quercus macrocarpa

General Information
Symbol: QUMA2
Group: Dicot
Family: Fagaceae
Duration: Perennial
Growth Habit : Shrub
Tree
Native Status : CAN   N
L48   N
Characteristics
Fact Sheet (pdf) (doc) Plant Guide (pdf) (doc)
Data Source and Documentation
About our new maps
Plants-NRCS Logos
green round image for nativity Native blue round image for introduced Introduced ocre round image for introduced and nativity Both white round image for no status Absent/Unreported
image for native, but no county data Native, No County Data image for introduced, but no county data Introduced, No County Data both introduced and native, but no county data Both, No County Data
Native Status:
lower 48 status L48    Alaska status AK    Hawaii status HI    Puerto Rico status PR    Virgin Islands status VI    Navassa Island NAV    Canada status CAN    Greenland status GL    Saint Pierre and Michelon status SPM    North America NA   

Images

click on a thumbnail to view an image, or see all the Quercus thumbnails at the Plants Gallery

Robert H. Mohlenbrock. USDA SCS. 1989. Midwest wetland flora: Field office illustrated guide to plant species . Midwest National Technical Center, Lincoln. Provided by USDA NRCS Wetland Science Institute (WSI). Usage Requirements .

©J.S. Peterson. USDA NRCS National Plant Data Center (NPDC). United States, MO, Saint Louis, Missouri Botanical Garden. October 14, 2002. Usage Requirements .

©J.S. Peterson. USDA NRCS National Plant Data Center (NPDC). United States, DC, Washington, USDA ARS National Arboretum. June 13, 2002. Usage Requirements .

©J.S. Peterson. USDA NRCS National Plant Data Center (NPDC). United States, DC, Washington, USDA ARS National Arboretum. June 13, 2002. Usage Requirements .

©J.S. Peterson. USDA NRCS National Plant Data Center (NPDC). United States, DC, Washington, USDA ARS National Arboretum. June 13, 2002. Usage Requirements .

©J.S. Peterson. USDA NRCS National Plant Data Center (NPDC). United States, DC, Washington, USDA ARS National Arboretum. June 13, 2002. Usage Requirements .

©J.S. Peterson. USDA NRCS National Plant Data Center (NPDC). United States, DC, Washington, USDA ARS National Arboretum. June 13, 2002. Usage Requirements .

Herman, D.E., et al. 1996. North Dakota tree handbook . USDA NRCS ND State Soil Conservation Committee; NDSU Extension and Western Area Power Administration, Bismarck. Provided by ND State Soil Conservation Committee . Provided by USDA NRCS Bismarck PMC (NDPMC) . United States, ND. Usage Requirements .

Herman, D.E., et al. 1996. North Dakota tree handbook . USDA NRCS ND State Soil Conservation Committee; NDSU Extension and Western Area Power Administration, Bismarck. Provided by ND State Soil Conservation Committee . Provided by USDA NRCS Bismarck PMC (NDPMC) . United States, ND. Usage Requirements .

Herman, D.E., et al. 1996. North Dakota tree handbook . USDA NRCS ND State Soil Conservation Committee; NDSU Extension and Western Area Power Administration, Bismarck. Provided by ND State Soil Conservation Committee . Provided by USDA NRCS Bismarck PMC (NDPMC) . United States, ND. Usage Requirements .

Herman, D.E., et al. 1996. North Dakota tree handbook . USDA NRCS ND State Soil Conservation Committee; NDSU Extension and Western Area Power Administration, Bismarck. Provided by ND State Soil Conservation Committee . Provided by USDA NRCS Bismarck PMC (NDPMC) . United States, ND. Usage Requirements .

Steve Hurst. Provided by ARS Systematic Botany and Mycology Laboratory . United States, OK, Stillwater. Usage Requirements .

W.G. Baxter. Provided by National Agricultural Library . Originally from USDA Forest Service . United States, KS. 1939. Usage Requirements .

W.D. Brush. Provided by National Agricultural Library . Originally from USDA Forest Service . United States, DC, Washington. Usage Requirements .

W.D. Brush. Provided by National Agricultural Library . Originally from USDA Forest Service . United States, DC, Washington. Usage Requirements .

W.D. Brush. Provided by National Agricultural Library . Originally from USDA Forest Service . United States, DC, Washington. Usage Requirements .

W.D. Brush. Provided by National Agricultural Library . Originally from USDA Forest Service . United States, DC, Washington. 1960. Usage Requirements .

W.D. Brush. Provided by National Agricultural Library . Originally from USDA Forest Service . United States, MA. Usage Requirements .

W.R. Mattoon. Provided by National Agricultural Library . Originally from USDA Forest Service . United States, KY. 1929. Usage Requirements .

R.S. Kellog. Provided by National Agricultural Library . Originally from USDA Forest Service . United States, IL. 1901. Usage Requirements .

A.L. McComb. Provided by National Agricultural Library . Originally from USDA Forest Service . United States, IA. 1945. Usage Requirements .

E.R. Mosher. Provided by National Agricultural Library . Originally from USDA Forest Service . United States, DC, Washington. 1914. Usage Requirements .

©Rebecca Weller. TreesForMe . United States, TX, Collin Co., Bob Woodruff Park. January 29, 2012. Usage Requirements .

©Rebecca Weller. TreesForMe . United States, TX, Collin Co., Bob Woodruff Park. January 29, 2012. Usage Requirements .

Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 1: 623. Provided by Kentucky Native Plant Society . Scanned by Omnitek Inc . Usage Requirements .

USDA NRCS. Wetland flora: Field office illustrated guide to plant species. USDA Natural Resources Conservation Service. Provided by NRCS National Wetland Team . Usage Requirements .

slideshow

Synonyms

Classification

Click on a scientific name below to expand it in the PLANTS Classification Report.
Rank Scientific Name and Common Name
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Magnoliopsida – Dicotyledons
Subclass Hamamelididae
Order Fagales
Family Fagaceae – Beech family
Genus Quercus L. – oak
Species Quercus macrocarpa Michx. – bur oak

Subordinate Taxa

The Plants Database includes the following 2 subspecies of Quercus macrocarpa . Click below on a thumbnail map or name for subspecies profiles. Plant is native (blue) Native Plant is introduced Introduced Plant is introduced Native and Introduced Related taxa legend Distribution of <i>
Quercus macrocarpa</i>
Michx. var. <i>
depressa</i>
(Nutt.) Engelm.
Quercus macrocarpa var. depressa
bur oak Distribution of <i>
Quercus macrocarpa</i>
Michx. var. <i>
macrocarpa </i>
Quercus macrocarpa var. macrocarpa
bur oak

Legal Status

Threatened and Endangered Information:
This plant is listed by the U.S. federal government or a state. Common names are from state and federal lists. Click on a place name to get a complete protected plant list for that location.
Connecticut bur oak Endangered
Massachusetts bur oak Special Concern

Wetland Status

Interpreting Wetland Status

North America
Arid West FAC
Atlantic and Gulf Coastal Plain FACU
Eastern Mountains and Piedmont FAC
Great Plains FACU
Midwest FAC
Northcentral & Northeast FACU
Western Mountains, Valleys, and Coast FACU

Related Links

More Accounts and Images
ARS Germplasm Resources Information Network (QUMA2)
CalPhotos (QUMA2)
Flora of North America (QUMA2)
Integrated Taxonomic Information System (QUMA2)
Kemper Center for Home Gardening (QUMA2)
Lady Bird Johnson Wildflower Center Native Plant Information Network (QUMA2)
Native American Ethnobotany (University of Michigan - Dearborn) (QUMA2)
Native Plants Network (QUMA2)
USDA Forest Service Fire Effects Information System (QUMA2)
University of Tennessee Herbarium (Distribution) (QUMA2)
University of Wisconsin - Stevens Point Freckmann Herbarium (QUMA2)
Related Websites
AL-Auburn University Plant Identification Resource (QUMA2)
Canada-Trees in Canada (QUMA2)
FL-USFS Tree Fact Sheets (University of Florida) (QUMA2)
IA-State Plants (QUMA2)
IL-Selecting Trees For Your Home (University of Illinois) (QUMA2)
Lady Bird Johnson Wildflower Center (QUMA2)
MN-The Right Tree Handbook (Minnesota Power) (QUMA2)
NC-Plant Fact Sheet (NCSU) (QUMA2)
OH-Ohio State University Pocket Gardner (QUMA2)
OK-Noble Foundation Plant Image Gallery (QUMA2)
OK-Oklahoma Biological Survey (QUMA2)
TX-Native Trees of Texas (QUMA2)
UK-Plants For A Future (QUMA2)
USDA Forest Service-Silvics of North America (QUMA2)
VA-Virginia Tech Dendrology (QUMA2)
WI-Trees of Wisconsin (University of Wisconsin-Green Bay Herbarium (QUMA2)
WI-Wisconsin Department of Natural Resources (QUMA2)

Wildlife

Food

Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Cover

Source Large Mammals Small Mammals Water Birds Terrestrial Birds

Description of Values

Value Class Food Cover


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FNA | Family List | FNA Vol. 3 | Fagaceae | Quercus

47. Quercus macrocarpa Michaux, plates 2, 3. 1801.

Bur oak, burr oak, mossy-cup oak, chêne à gros fruits

Quercus macrocarpa var. depressa (Nuttall) Engelmann; Q . mandanensis Rydberg

Trees , deciduous, to 30(-50) m. Bark dark gray, scaly or flat-ridged. Twigs grayish or reddish, 2-4 mm diam., often forming extensive flat, radiating, corky wings, finely pubescent. Buds 2-5(-6) mm, glabrous. Leaves: petiole (6-)15-25(-30) mm. Leaf blade obovate to narrowly elliptic or narrowly obovate, often fiddle-shaped, (50-)70-150(-310) × (40-)50-130(-160) mm, base rounded to cuneate, margins moderately to deeply lobed, toothed, deepest sinuses near midleaf (at least in proximal 2/3), sinuses reaching nearly to midrib, longer lobes grading into shallow lobes or merely simple teeth distally, shallower, compound lobes proximally, secondary veins arched, divergent, 4-5(-10) on each side, apex broadly rounded or ovate; surfaces abaxially light green or whitish, with minute appressed-stellate hairs forming dense, rarely sparse, tomentum, erect felty hairs absent, adaxially dark green or dull gray, sparsely puberulent to glabrate. Acorns 1-3 on stout peduncle (0-)6-20(-25) mm; cup hemispheric or turbinate, (8-)15-50 mm deep × (10-)20-60 mm wide, enclosing 1/2-7/8 nut or more, scales closely appressed, laterally connate, broadly triangular, keeled, tuberculate, finely grayish tomentose, those near margins often with soft awns to 5-10 mm or more, forming fringe around nut; nut light brown or grayish, ovoid-ellipsoid or oblong, (15-)25-50 × (10-)20-40 mm, finely puberulent or floccose. Cotyledons distinct. 2 n = 24.

Flowering in spring. Bottomlands, riparian slopes, poorly drained areas, prairies, usually on limestone or calcareous clays (in nw part of range on dry slopes and ridges, prairies); 0-1000 m; Man., N.B., Sask., Ont., Que.; Ala., Ark., Conn., Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Mo., Mont., Nebr., N.J., N.Y., N.Dak., Ohio, Okla., Pa., S.Dak., Tenn., Tex., Vt., Va., W.Va., Wis., Wyo.

Quercus macrocarpa is one of our most cold-tolerant oak species; it also endures a wide variety of other harsh conditions including poor dry soils and wet, poorly drained, and inundated locations. Putative hybrids with Q . bicolor are common in the northeastern part of its range, where the two species often occur together in wet, poorly drained habitats. The effect of this contact may be partially responsible for morphologic differences across the range of Q . macrocarpa . The large acorns are best developed in the southern part of the range, and a clinal decrease in acorn size and extent of the mossy fringe on the acorn cup seems to occur as one travels from south to north. In the northwest part of its range, Q . macrocarpa varies clinally to smaller, shrubbier forms on bluffs and hillsides, with smaller, less fringed cups, that are the basis of Q . macrocarpa var. depressa (Nuttall) Engelmann and Q . mandanensis Rydberg. These scrubby forms may merit formal recognition after more thorough study; they are treated here as clinal variants of the species. Quercus macrocarpa forms putative hybrids also with Q . alba in the savannah-type regions of the midwest. Putative hybrids with Q . gambelii occur out of the range of Q . macrocarpa .

Quercus macrocarpa is the only oak species native to Montana (in the southeast corner). Wood of Q . macrocarpa is similar to that of Q . alba and produces one of the best and most durable oak lumbers.

Native Americans used Quercus macrocarpa medicinally to treat heart troubles, cramps, diarrhea, Italian itch, and broken bones, to expel pinworms, and as an astringent (D. E. Moerman 1986).

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http://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Quercus+macrocarpa&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant ---> https://calphotos.berkeley.edu/cgi/img_query?query_src=dl&where-taxon=Quercus+macrocarpa&where-lifeform=specimen_tag&rel-lifeform=ne&rel-taxon=begins+with&where-lifeform=Plant

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Number of matches : 33
Query: SELECT * FROM img WHERE ready=1 and taxon like "Quercus macrocarpa%" and (lifeform != "specimen_tag" OR lifeform != "Plant") ORDER BY taxon

Click on the thumbnail to see an enlargement

Quercus macrocarpa
Quercus macrocarpa
Bur Oak
ID: 0000 0000 1002 0284 [detail]
© 2002 University of California Museum of Paleontology

Quercus macrocarpa
Quercus macrocarpa
ID: 0000 0000 0306 1578 [detail]
© 2006 Louis-M. Landry

Quercus macrocarpa
Quercus macrocarpa
ID: 0000 0000 0107 1533 [detail]
© 2007 Louis-M. Landry

Quercus macrocarpa
Quercus macrocarpa
ID: 0000 0000 0508 0139 [detail]
© 2008 Louis-M. Landry

Quercus macrocarpa
Quercus macrocarpa
ID: 0000 0000 0508 0140 [detail]
© 2008 Louis-M. Landry

Quercus macrocarpa
Quercus macrocarpa
ID: 0000 0000 0508 0141 [detail]
© 2008 Louis-M. Landry

Quercus macrocarpa
Quercus macrocarpa
ID: 0000 0000 0508 0142 [detail]
© 2008 Louis-M. Landry

Quercus macrocarpa
Quercus macrocarpa
ID: 0000 0000 0508 0143 [detail]
© 2008 Louis-M. Landry

Quercus macrocarpa
Quercus macrocarpa
ID: 0000 0000 0508 0144 [detail]
© 2008 Louis-M. Landry

Quercus macrocarpa
Quercus macrocarpa
Bur Oak
ID: 0000 0000 0608 1653 [detail]
© 2008 Jason E. Willand

Quercus macrocarpa
Quercus macrocarpa
ID: 0000 0000 0610 0588 [detail]
© 2010 Louis-M. Landry

Quercus macrocarpa
Quercus macrocarpa
ID: 0000 0000 0610 0589 [detail]
© 2010 Louis-M. Landry

Quercus macrocarpa
Quercus macrocarpa
Bur Oak
ID: 0000 0000 1010 2627 [detail]
© 2010 Barry Breckling

Quercus macrocarpa
Quercus macrocarpa
Bur Oak
ID: 0000 0000 1010 2628 [detail]
© 2010 Barry Breckling

Quercus macrocarpa
Quercus macrocarpa
Bur Oak
ID: 0000 1111 1234 4316 [detail]
© 2016 Keir Morse

Quercus macrocarpa
Quercus macrocarpa
Bur Oak
ID: 0000 1111 1234 4317 [detail]
© 2016 Keir Morse

Quercus macrocarpa
Quercus macrocarpa
Bur Oak
ID: 0000 1111 1234 4318 [detail]
© 2016 Keir Morse

Quercus macrocarpa
Quercus macrocarpa
Bur Oak
ID: 0000 1111 1234 4319 [detail]
© 2016 Keir Morse

Quercus macrocarpa
Quercus macrocarpa
Bur Oak
ID: 0000 1111 1234 4320 [detail]
© 2016 Keir Morse

Quercus macrocarpa
Quercus macrocarpa
ID: 0000 0000 1016 2029 [detail]
© 2016 Zoya Akulova

Quercus macrocarpa
Quercus macrocarpa
ID: 0000 0000 1016 2030 [detail]
© 2016 Zoya Akulova

Quercus macrocarpa
Quercus macrocarpa
ID: 0000 0000 1019 0964 [detail]
© 2019 Zoya Akulova

Quercus macrocarpa
Quercus macrocarpa
ID: 0000 0000 1019 0963 [detail]
© 2019 Zoya Akulova

Quercus macrocarpa
Quercus macrocarpa
ID: 0000 0000 1019 0962 [detail]
© 2019 Zoya Akulova

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