Illinois Natural History Survey - University of Illinois

Silphium terebinthinaceum
Prairie-dock
Taxonomy

Synonyms: Silphium terebinthinaceum var. terebinthinaceum

Subspecific taxa:

Classification:

  • Magnoliophyta

Other taxonomic & nomenclature sources: USDA PlantsITISThe Plant ListIPNI

Images

   
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Species Distribution
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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: No Information

Notes:

Origin: Native

Species Description

General: Dicot-herb, perennial

Roots: primary

Shoots: basal leaf arrangment; simple leaf type; serrate leaf margin; Pinnate leaf venation; oblique leaf shape

Inflorescence: panicle, corymb, head

Flowers: unisexual, monoecious; 5 merous; yellow; epigynous ovary position

Fruit: achene

Physiology: autotrophic

Ecology & Natural History

Habitat:

ILPIN Notes:

Functional Relationships:

Human Relationships:

  • Edibility [?] :
  • Showy Flowers:

Wildlife and Livestock Information:

  • Food Value:
  • Cover Value:

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

  • Entire State: 4
  • Chicago Area: 5

Comments & Questions

Post: 09/2017
Why isn't there a page for Silphium pinnatifidum?
The USDA plants website shows it as occurring in Illinois.

IL Plant Response:
Its not clear if this if S. pinnatifudum is actually its own species or a variety Silphium terebinthinaceum. The Flora of North America and ITIS list it as as a variety.

We decided to be conservative and include this as a variety under S. terebinthinaceum until further information is available.

For further reading, there is a report that discusses S. pinnatifudum's ecology and status, which can be downloaded here:
(https://www.ideals.illinois.edu/bitstream/handle/2142/9906/inhscwpev02005i00003_opt.pdf?sequence=2&isAllowed=y)

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