Helianthus decapetalus
Thin-leaved sunflower, Pale sunflower Taxonomy
Synonyms: Subspecific taxa: Classification:
Other taxonomic & nomenclature sources: USDA Plants;  ITIS;  The Plant List;  IPNI 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: FLNA;  USDA Plants;  BONAP;  BISON
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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 open woods; in northern Illinois on woodland borders. ILPIN Notes: Possible use as breadstuff, oil, soup, coffee substitute. Disk florets perfect and fertile; ray florets sterile. Rodgers, C.E. T.E. Thomspon and G.J. Seiler. 1982. Sunflower species of the United States. National Sunflower aasociation , Bismark, N.D. 75 pp. Leaves opposite below, becoming alternate about halfway. up stem; Leaves dark green, gritty about, light green and nearly hairless below. Leaf bases tapering to a winged petiole. Functional Relationships:
Human Relationships:
Wildlife and Livestock Information:
Coefficient of Conservatism (C-value) [?] :
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