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Family: rubiaceae
Common name(s): Common Buttonbush
Hardiness ratings: USDA zone 4~5 - 9~10 
General resources
Links for Cephalanthus occidentalis
- Carolina Nature - Illustrated woody plant profile, with notes on range and identification.
 (15 photos)
- Dallas County Master Gardener Association - Informative plant-of-the-month profile highlighting horticultural benefits and care. (zone 5-10) (3 photos)
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 5-10) (18 photos)
- Denver Botanic Gardens - Description, native range, and cultural requirements. (additional pages for other varieties) (zone 5) (5 photos)
- Floridata - Illustrated informative profile page with notes on culture, usage, and noteworthy features. (zone 5-10) (3 photos)
- Garden.org - Community-assembled plant profile (17 photos)
- Illinois Wildflowers - Informative illustrated page with description and cultivation details, also covering range and faunal associations. (3 photos)
- Kansas Wildflowers & Grasses - Plant portrait with botanical details and description (12 photos)
- Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (64 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) (13 photos). Also a page for 'SMCOSS' SUGAR SHACK.
- Missouri Plants - Description and photographs of botanical features, with notes about habitat and native status. (9 photos)
- Native Plant Society of Texas - Plant profile with basic characteristics, some horticultural information, and a distribution map within Texas. (5 photos)
- Native Plants of Central Texas - Photos with brief comments from University of Texas at Austin. (10 photos)
- North Carolina State University factsheet - Plant profile with horticultural details and comments (zone 5-9) (12 photos)
- Ontario Rock Garden Society - Plant of the month profile (4 photos)
- Ontario Rock Garden Society: Cephalanthus occidentalis 'Sputnik' - Germination information (use search on page to find this taxon)
- Trees and Shrubs Online - Reference page curated by the International Dendrology Society with descriptive characteristics and horticultural notes. (4 photos)
- Virginia Tech Dendrology - Factsheet with botanical characteristics and photos of various features. (6 photos)
Common name(s): Buttonwillow
Hardiness ratings: USDA zone 4 - 10
Links
- Las Pilitas Nursery - Catalog page about this California native, with description and horticultural basics. (zone 4-10) (7 photos)
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