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Family: plantaginaceae
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 Penstemon cardwellii
- American Penstemon Society - Detailed description of the species' botanical characteristics, habitat, and native range.
 (1 photo)
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zones 5a-9b) (2 photos)
- NARGS Image Gallery: Penstemon cardwellii 'Roseus' - Photograph contributed by North American Rock Garden Society member.
- Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records.
- Rock Garden Plant Database - Encyclopedic entry with taxonomical, botanical, and horticultural details. (1 photo)
- Turner Photographics - Profile of wildflower of the US Pacific Northwest, with botanical description, habitat and distribution, and photo gallery.
- Wild Ginger Farm - One of the plants featured on this specialty nursery's catalog page, with photo and brief description. (2 photos)
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