Illinois Natural History Survey - University of Illinois

Helianthus grosseserratus
Thick-tooth sunflower, Saw-tooth sunflower
Taxonomy

Synonyms:

Subspecific taxa:

Classification:

Other taxonomic & nomenclature sources: USDA Plants;  ITIS;  The Plant List;  IPNI

Images

   
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Species Distribution
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More about map & 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: FLNA;  USDA Plants;  BONAP;  BISON

Collections, Observations & Flowering by Month [?]

J
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F
0
M
0
A
0
M
0
J
0
J
0
A
0
S
0
O
0
N
0
D
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Collections & Observations by Decade [?]

Species Status

Status/Listing: No Information

Notes:

Origin: Native

Species Description

General: Dicot-herb, perennial

Roots: adventitious, fibrous, rhizomes

Shoots: alternate, opposite leaf arrangment; simple leaf type; serrate leaf margin; Pinnate leaf venation; oblong, lanceolate leaf shape

Inflorescence: head

Flowers: perfect; complete, regular, irregular; yellow; epigynous ovary position

Fruit: achene

Physiology: autotrophic

Reproduction: sexual, vegetative

Ecology & Natural History

Habitat: Species is distributed in edges of woods, moist places at bluff bases, ditches, along roads and railroads. In northern Illinois, species is very common in degraded prairie remnants.

ILPIN Notes: Species may possibly be used as: bread stuff; soup; oil; coffee substitute. Rodgers, C.F., T.E. Thompson, and G.J. Seiler. 1982. Sunflower species of the United States. National Sunflower Association, Bismark, N.D. 75 pp. Disc florets are perfect and fertile; ray florets are sterile. This is the tallest sunflower, to 5 m. It is distinguished by: 1) hairless stems; 2) flat, deeply serrate, long-petioled leaves; 3) flower leaf surfaces covered with soft, wooly hairs.

Functional Relationships:

  • Pollinators:
  • Dispersal:
  • Mycorrhizae:
  • N2 fixation:

Human Relationships:

  • Edibility [?] :
  • Showy Flowers:

Wildlife and Livestock Information:

  • Food Value:
  • Cover Value:

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

  • Entire State: 2
  • Chicago Area: 2

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