Illinois Natural History Survey - University of Illinois

Helianthus petiolaris
Petioled sunflower
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 [?]

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J
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A
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Collection & Observation Timeline [?]

Species Status

Status/Listing: No Information

Notes:

Origin: North America

Species Description

General: Dicot-herb, annual

Roots: adventitious, fibrous

Shoots: alternate leaf arrangment; simple leaf type; dentate leaf margin; Other leaf venation; linear, oblong, lanceolate, orbicular and peltate, cordate leaf shape

Inflorescence: head

Flowers: perfect; 5 merous; complete, regular, irregular; yellow; epigynous ovary position

Fruit: achene

Physiology: autotrophic

Ecology & Natural History

Habitat: Locally abundant along railroads, especially in the sand country. Also in newly disturbed sand areas. Railroads, roads, waste ground.

ILPIN Notes: Genus in general: some hayfever; seeds as breadstuff, as an oil source, a coffee substitute. Provided cytoplasmic male sterility for commercial oil seed industry Naturally hybridizes with Helianthus annuus. Disk florets perfect and fertile, ray florets sterile. Pales (chaff of flower head) conspicuously white-haired at tip; involucral bracts short haired on margins, the hairs scarcely showing; achenes hairy, 1.2-2.5 mm broad; leaves with appressed hairs but not scabrous; lower leaves usually not heart-shaped. One of the earlier-flowering species of the genus. Similar to Helianthus annuus, but smaller. Introduced from Western states. Rogers, Thompson, and Seiler show this species as native to Illinois. Rogers, C. E., T. E. Thompson, and G. J. Seiler. 1982. Sunflower species of the United States. National Sunflower Association, Bismark, North Dakota. 75 pp.

Functional Relationships:

  • Pollinators insects (insect)

Human Relationships:

  • Edibility [?] : yes
  • Showy Flowers:

Wildlife and Livestock Information:

  • Food Value:
  • Cover Value:

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

  • Entire State:
  • Chicago Area:

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