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Helianthus rydbergii

Family: asteraceae

General resources

• Wikipedia. Online encyclopedia entry (if defined).
• Google images. Web search for photographs.
• GRIN. Taxonomical details, with common names, distribution, and synonyms.
• The Plant List. Taxonomical lookup
• Dave's Garden. Search the extensive PlantFiles database.

Links for Helianthus rydbergii

• Ontario Rock Garden Society - Germination information