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Family: apocynaceae
Common name(s): tweedia
Synonym(s): Oxypetalum caeruleum, Tweedia coerulea, Tweedia caerulea
Hardiness ratings: USDA zone 7b~10 - 10~11 
General resources
Links for Oxypetalum coeruleum
- Annie's Annuals: Tweedia caerulea 'Heaven Born' (on archive.org) - Catalog page with photo, basic horticultural information, and noteworthy features. (zone 8-11)
 (1 photo)
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 8-10) (12 photos)
- Denver Botanic Gardens - Description, native range, and cultural requirements. (additional pages for other varieties) (zone 8)
- 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 10-11)
- North Carolina State University factsheet - Plant profile with horticultural details and comments (zone 8-10) (2 photos)
- Ontario Rock Garden Society - Germination information (use search on page to find this taxon)
- Plant Delights Nursery - Catalog page with photo, horticultural basics, and descriptive blurb. (zone 7b-10) (1 photo)
- Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (zone 8-10) (5 photos)
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