Helianthus occidentalis Riddell - Western Sunflower


 

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Helianthus occidentalis - (image 1 of 4)

 

Taxonomy

Family: Asteraceae

Habitat

Sand prairies, dry hill prairies.

Associates

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Distribution

 

Morphology

Herbaceous perennial. Basal leaves conspicuous at flowering time; stems leaves fewer than 6 pairs, the cauline ones strongly reduced upwards. Floral heads with both ray and disk flowers; rays yellow; disk corollas yellow or brownish-yellow; phyllaries acuminate.

Notes

Flowers mid July to early October

Wetland indicator: Facultative upland-

The common sunflower in open sand near Lake Michigan.

Bibliography

Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.

 


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 Michael Hough 2005