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Family: plantaginaceae
Common name(s): Cascade penstemon
Hardiness ratings: USDA zone 3~5 - 9 
General resources
Links for Penstemon serrulatus
- 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) (3 photos)
- Garden.org - Community-assembled plant profile (4 photos)
- Iris' Garden - Gardener in the Netherlands presents a photo of this plant, with basic horticultural information. (1 photo)
- Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (2 photos)
- NARGS Image Gallery - Photograph(s) contributed by North American Rock Garden Society members. (3 photos)
- Ontario Rock Garden Society - Germination information (additional information for other varieties)
- Rainy Side Gardeners - Plant profile compiled by two gardeners in the Pacific Northwest. Includes propagation and pruning methods, and commentary. (zone 3-9) (4 photos)
- Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (1 photo)
- Turner Photographics - Profile of wildflower of the US Pacific Northwest, with botanical description, habitat and distribution, and photo gallery.
- Washington Native Plant Society - Photo and brief description. (20 photos)
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