Illinois Natural History Survey - University of Illinois

Quercus phellos
Willow oak
Taxonomy

Synonyms:

Subspecific taxa:

Classification:

Other taxonomic & nomenclature sources: USDA PlantsITISThe Plant ListIPNI

Images

   
View all images. View all at PhytoImages.
Species Distribution
If map does not appear refresh browser Refresh
Click map to view & download detailed occurrence records

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 [?]

J
0
F
0
M
0
A
0
M
0
J
0
J
0
A
0
S
0
O
0
N
0
D
0

Collection & Observation Timeline [?]

Species Status

Status/Listing: State threatened

Notes:

Origin: Native

Species Description

General: Dicot-woody, perennial

Roots: primary

Shoots: alternate leaf arrangment; simple leaf type; entire leaf margin; Pinnate leaf venation; linear, oblong leaf shape

Inflorescence: catkin

Flowers: unisexual, monoecious; incomplete, not petals

Fruit: nut

Physiology: autotrophic; C3 C02 fixation

Ecology & Natural History

Habitat: Wet borders of streams and swamps.

ILPIN Notes: Northern range limit. Maybe causes hay fever; acorns edible. Narrower leaves than Quercus imbricaria. Waterfowl food value esp. wood ducks Martin, A.C., H.S. Zim, and A.L. Nelson. 1951. American Wildlife and Plants. McGraw-Hill Book Co.

Functional Relationships:

  • Pollinators insects (wind)

Human Relationships:

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

Wildlife and Livestock Information:

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

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

  • Entire State: 7
  • Chicago Area:

Post a Comment or Question About this Plant
Your Name


Your email address (required)


Comment/Question (required and please limit to 300 words)

Note: All submissions are moderated and only some are posted. Posted comments may be edited for length. An email address will not be posted, but it is required for communication with the site moderator. Comments focused outside of Illinois and neighboring states may be posted, but more attention will be given to Illinois centered information. Thanks for your interest.