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Family: plantaginaceae
Common name(s): Cardwell's penstemon
Hardiness ratings: USDA zone 5~6 - 9 
General resources
- Wikipedia. Online encyclopedia entry (if defined).
- Google images. Web search for photographs.
- GRIN. Taxonomical details, with common names, distribution, and synonyms.
- The Plant List. Taxonomical lookup
Links for Penstemon cardwellii
- All Things Plants - Community-assembled plant profile
 (4 photos)
- 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. (zone 5-9) (2 photos)
- NARGS Image Gallery - Photograph(s) contributed by North American Rock Garden Society members. (2 photos)
- NARGS: Penstemon cardwellii 'Roseus' - Plant of the month portrait, with description and information about cultivation and propagation. (1 photo)
- Ontario Rock Garden Society - Germination information (additional information for other varieties)
- Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (zone 6)
- 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. (1 photo)
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