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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 tubaeflorus
- 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 4a-8b) (4 photos)
- Kemper Center - Plantfinder page for one of the plants growing at the Missouri Botanical Garden, with usually one or more photos, horticultural information, and noteworthy characteristics. (zone 4 to 8) (1 photo)
- Missouri Plants - Description and photographs of botanical features, with notes about habitat and native status. (4 photos)
- Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (1 photo)
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