Quercus macrocarpa - Michx.
Bur Oak
Other Common Names: bur oak
Taxonomic Status: Accepted
Related ITIS Name(s): Quercus macrocarpa Michx. (TSN 19287)
Unique Identifier: ELEMENT_GLOBAL.2.158441
Element Code: PDFAG05190
Informal Taxonomy: Plants, Vascular - Flowering Plants - Beech Family
 
Kingdom Phylum Class Order Family Genus
Plantae Anthophyta Dicotyledoneae Fagales Fagaceae Quercus
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Concept Reference
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Concept Reference: Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Concept Reference Code: B94KAR01HQUS
Name Used in Concept Reference: Quercus macrocarpa
Taxonomic Comments: Flora North America does not recognize Q. macrocarpa var. depressa as a distinct variety, while Kartesz (1999) does.
Conservation Status
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NatureServe Status

Global Status: G5
Global Status Last Reviewed: 16May2016
Global Status Last Changed: 06Sep1983
Ranking Methodology Used: Ranked by inspection
Rounded Global Status: G5 - Secure
Nation: United States
National Status: N5?
Nation: Canada
National Status: N5 (15Apr2014)

U.S. & Canada State/Province Status
United States Alabama (S2), Arkansas (SNR), Connecticut (SU), Delaware (SNA), District of Columbia (S1), Illinois (S5), Indiana (S5), Iowa (S5), Kansas (SNR), Kentucky (S5), Louisiana (S1), Maine (SNR), Maryland (S1), Massachusetts (S3), Michigan (SNR), Minnesota (SNR), Mississippi (S2), Missouri (SNR), Montana (S1), Nebraska (SNR), New Hampshire (S1), New Jersey (SNR), New Mexico (SNR), New York (S4), North Carolina (SNR), North Dakota (SNR), Ohio (SNR), Oklahoma (SNR), Pennsylvania (S2S4), Rhode Island (SNR), South Dakota (S5), Tennessee (SNR), Texas (SNR), Vermont (SNR), Virginia (S1), West Virginia (S4), Wisconsin (SNR), Wyoming (S2S3)
Canada Alberta (SU), Manitoba (S5), New Brunswick (S2), Ontario (S5), Quebec (S3S4), Saskatchewan (S5?)

Other Statuses

NatureServe Global Conservation Status Factors

Range Extent Comments: E. temperate N. Am., from New Brun. to Sask., and south from MD and AR to TX. Peripheral.

Other NatureServe Conservation Status Information

Distribution
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Global Range: E. temperate N. Am., from New Brun. to Sask., and south from MD and AR to TX. Peripheral.

U.S. States and Canadian Provinces
Color legend for Distribution Map

U.S. & Canada State/Province Distribution
United States AL, AR, CT, DC, DEexotic, IA, IL, IN, KS, KY, LA, MA, MD, ME, MI, MN, MO, MS, MT, NC, ND, NE, NH, NJ, NM, NY, OH, OK, PA, RI, SD, TN, TX, VA, VT, WI, WV, WY
Canada AB, MB, NB, ON, QC, SK

Range Map
No map available.


U.S. Distribution by County Help
State County Name (FIPS Code)
AL Pickens (01107)
CT Litchfield (09005)
LA Bossier (22015), Caddo (22017)*
MA Berkshire (25003), Hampshire (25015)
MD Allegany (24001), Baltimore (city) (24510)*, Caroline (24011), Frederick (24021)*, Harford (24025), Montgomery (24031), Queen Annes (24035)*, Talbot (24041)*, Washington (24043)
MS Chickasaw (28017), Clay (28025), Lowndes (28087), Oktibbeha (28105), Pontotoc (28115)
MT Carter (30011)
NH Belknap (33001)*, Grafton (33009)
NJ Sussex (34037)
VA Clarke (51043), Frederick (51069), Rockingham (51165), Warren (51187)*
* Extirpated/possibly extirpated
U.S. Distribution by Watershed Help
Watershed Region Help Watershed Name (Watershed Code)
01 Merrimack (01070006)+*, Middle Connecticut (01080201)+, Housatonic (01100005)+
02 Rondout (02020007)+, Chester-Sassafras (02060002)+*, Gunpowder-Patapsco (02060003)+, Choptank (02060005)+*, North Branch Potomac (02070002)+, Conococheague-Opequon (02070004)+, South Fork Shenandoah (02070005)+, North Fork Shenandoah (02070006)+*, Shenandoah (02070007)+, Middle Potomac-Catoctin (02070008)+, Monocacy (02070009)+*, Middle Potomac-Anacostia-Occoquan (02070010)+, Western Lower Delmarva (02080109)+
03 Town (03160102)+, Tibbee (03160104)+, Middle Tombigbee-Lubbub (03160106)+, Noxubee (03160108)+
10 Upper Little Missouri (10110201)+
11 Bodcau Bayou (11140205)+, Cross Bayou (11140304)+*
+ Natural heritage record(s) exist for this watershed
* Extirpated/possibly extirpated
Ecology & Life History
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General Description: Bur Oak is a small to large tree. Its bark is deeply furrowed and twigs are stout. The alternate, oblong-elliptic leaves are 10-20 cm in length and are deeply to shallowly lobed, with the terminal lobe being the largest. Leaves are dark green and shiny above but silvery below with fine, star-shaped hairs. Male flowers of 5-10 stamens are borne in long, loose, pendulous inflorescences from the leaf axils. 1 to several female flowers occur in the axils of new leaves. The acorn is up to 2-4 cm long, ellipsoidal, and the top half or more is enclosed by a roughened, fringe-margined cup.
Diagnostic Characteristics: This is Montana's only native oak.
Economic Attributes Not yet assessed
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Management Summary Not yet assessed
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Population/Occurrence Delineation Not yet assessed
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Population/Occurrence Viability
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U.S. Invasive Species Impact Rank (I-Rank) Not yet assessed
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Authors/Contributors
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Element Ecology & Life History Edition Date: 20Nov1994
Element Ecology & Life History Author(s): JM

Botanical data developed by NatureServe and its network of natural heritage programs (see Local Programs), The North Carolina Botanical Garden, and other contributors and cooperators (see Sources).

References
Help
  • Heidel, B.L. 1993. Survey for QUERCUS MACROCARPA in the Powder River Resource Area, Miles City District, Bureau of Land Management, Montana. Unpublished report to the Bureau of Land Management, Miles City District. Montana Natural Heritage Program, Helena, MT. 13 pp. plus appendices.

  • Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

  • Little, E.L., Jr. 1979. Checklist of United States trees (native and naturalized). Agriculture Handbook No. 541. U.S. Forest Service, Washington, D.C. 375 pp.

  • Severson, K.E. and J.K. Kranz. 1978. Management of burr oak on deer winter range. Wildlife Society Bulletin 6:212-216.

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