Illinois Natural History Survey - University of Illinois

Quercus rubra
Red oak
Taxonomy

Synonyms: Quercus borealis

Subspecific taxa:

Classification:

Other taxonomic & nomenclature sources: USDA PlantsITISThe Plant ListIPNI

Images

   
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Species Distribution
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County Map Legend
Absent:
Not known from county
Medium confidence:
Medium or unknown confidence;
often old records or unverifiable observations
Medium-high confidence:
Often observations by expert botanists
High confidence:
Often vouchered herbarium records
Planted / introduced:
Native species introduced outside historic range,
or only in planted locations within county (e.g., restorations)
Historic / extirpated:
Only historic records for the species; likely extirpated
(Note that this category is not yet functional)

North American distribution maps for this species: FLNAUSDA PlantsBONAPBISON

Collection & Observation Phenology [?]

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Collection & Observation Timeline [?]

Species Status

Status/Listing: No Information

Notes:

Origin: Native

Species Description

General: Dicot-woody, perennial

Roots: primary

Shoots: alternate leaf arrangment; simple leaf type; lobed (pinnately), parted (pinnately) leaf margin; Pinnate leaf venation; obovate leaf shape

Inflorescence: catkin

Flowers: unisexual, monoecious; incomplete, not petals

Fruit: nut

Physiology: autotrophic; C3 C02 fixation

Ecology & Natural History

Habitat: Species is distributed in rich, upland woods; along river banks; well-drained slopes; ocasionally dry ridges.

ILPIN Notes: Species maybe causes hayfever; fruit is edible after preparation. Marshbirds and shorebirds eat food in the form of acorns; terrestrial furbearers (esp. raccoons, tree squirrels) eat food in the form of acorns, bark, wood; also good den tree. Regarding waterfowl food value, this pertains especially to wood ducks. Regarding small non-game bird food value, this especially pertains to grackles, blue jays, brown thrashers, red-bellied woodpeckers, red-headed woodpeckers. Regarding small mammals food value, this especially pertains to eastern chipmunks, white-footed mice. Form - whips, seeds, balled & burlapped, seedlings. Wood is heavy, hard, strong, and close-grained. Species has pistillate flowers in groups of 1-3; leaves with 7-11 shallow, bristle-tipped lobes; acorn with very shallow, saucer-shaped cap. Seed company numbers: 2, 4, 13, 14, 15, 16, 17, 18, 19, 20, 21, 27, 28, 29, 35, 37, 39, 40, 42, 52.

Functional Relationships:

  • Pollinators insects (wind)

Human Relationships:

  • Edibility [?] : yes-qualified
  • Showy Flowers: low

Wildlife and Livestock Information:

  • Food Value:
  • Cover Value: small non-game bird: good; small mammals: good

Coefficient of Conservatism (C-value) [?] :

  • Entire State: 5
  • Chicago Area: 7

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