Illinois Natural History Survey - University of Illinois

Juglans nigra
Black walnut
Taxonomy

Synonyms:

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 [?]

J
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F
0
M
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A
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M
0
J
0
J
0
A
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S
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O
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N
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D
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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; compound, pinnately leaf type; serrate leaf margin; Pinnate leaf venation; linear, lanceolate leaf shape

Inflorescence: spike, catkin

Flowers: unisexual, monoecious; incomplete, not petals; perigynous ovary position

Fruit: nut

Physiology: autotrophic; C3 C02 fixation

Ecology & Natural History

Habitat: Species is distributed in rich woodlands at base of slopes or bluffs, valleys along streams.

ILPIN Notes: This is a valuable timber tree. Wood is heavy, hard, strong, close-grained, and very durable in contact with the soil. Female flowers are perigynous and in spikes; pale brown, soft, hairy buds; large spherical fruits. Seed company numbers: 2, 4, 13, 14, 15, 18, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29, 33, 35, 36, 37, 39, 40, 41, 52. Form - whips, bare roots, seedlings, seeds. Plant nuts soon after they drop in fall. Develops a strong tap root so difficult to transplant. Nut kernal is edible; causes hayfever; nut hulls were once used as a dye. Terrestrial furbearers (esp. tree squirrels) eat nuts as food. Regarding aquatic species food value, this pertains to aquatic furbearers.

Functional Relationships:

  • Pollinators insects (wind)

Human Relationships:

  • Edibility [?] : yes
  • Showy Flowers:

Wildlife and Livestock Information:

  • Food Value:
  • Cover Value:

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

  • Entire State: 4
  • Chicago Area: 5

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