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Family: asteraceae
Common name(s): Ironweed
Synonym(s): Vernonia lettermanii
Hardiness ratings: USDA zone 4 - 9 
General resources
Links for Vernonia lettermannii
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 4-9a)
- Denver Botanic Gardens - Description, native range, and cultural requirements. (additional pages for other varieties) (zone 4)
- Digging Dog Nursery - Catalog page with descriptive information (additional pages for other varieties) (zone 4). Also a page for 'Iron Butterfly'.
- Garden.org - Community-assembled plant profile (2 varieties in database)
 (3 photos)
- Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation.
- Missouri Botanical Garden: Vernonia lettermannii 'Iron Butterfly' - Plantfinder page for one of the plants growing at the garden, with usually one or more photos, horticultural information, and noteworthy characteristics. (zone 4-9)
- North Carolina State University factsheet - Plant profile with horticultural details and comments (zone 4-9a) (11 photos). Also a page for 'Iron Butterfly'.
- Plant Delights Nursery - Catalog page with photo, horticultural basics, and descriptive blurb. (1 photo)
- Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (zone 4-9)
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