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Family: asteraceae
Common name(s): Purple-headed Sneezeweed
Hardiness ratings: USDA zone 4~5 - 8~10 
General resources
Links for Helenium flexuosum
- Annie's Annuals (on archive.org) - Catalog page with photo, basic horticultural information, and noteworthy features. (zone 4-10)
 (1 photo)
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 4b-8) (8 photos)
- Garden.org - Community-assembled plant profile (2 varieties in database) (9 photos)
- Illinois Wildflowers - Informative illustrated page with description and cultivation details, also covering range and faunal associations.
- Kansas Wildflowers & Grasses - Plant portrait with botanical details and description (13 photos)
- Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (13 photos)
- Missouri Botanical Garden - Plantfinder page for one of the plants growing at the garden, with usually one or more photos, horticultural information, and noteworthy characteristics. (zone 5-9) (3 photos)
- Missouri Plants - Description and photographs of botanical features, with notes about habitat and native status. (8 photos)
- North Carolina State University factsheet - Plant profile with horticultural details and comments (zone 5-9) (5 photos)
- Ontario Rock Garden Society - Germination information (use search on page to find this taxon)
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