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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.
Links for Centaurea cyanus
- Annie's Annuals: Centaurea cyanus 'Black Gem' - Catalog page with photo, basic horticultural information, and noteworthy features. (additional cultivars listed in catalog)
 (2 photos)
- BBC Gardening - Plant profile with horticultural details and garden uses. (1 photo). Also a page for Black Ball.
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (54 photos)
- Iris' Garden - Gardener in the Netherlands presents a photo of this plant, with basic horticultural information. (1 photo)
- Kemper Center - Plantfinder page for one of the plants growing at the Missouri Botanical Garden, with usually one or more photos, horticultural information, and noteworthy characteristics. (2 photos)
- Missouri Plants - Description and photographs of botanical features, with notes about habitat and native status. (5 photos)
- North Carolina State University factsheet - Plant profile with horticultural details and comments (1 photo)
- Paghat's Garden - Illustrated articles by a gardener in the Pacific Northwest, with background and personal observations. (6 photos)
- Rob's Plants - Plant profile with basic horticultural information and often personal observations. (1 photo)
- Turner Photographics - Profile of wildflower of the US Pacific Northwest, with botanical description, habitat and distribution, and photo gallery.
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