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Family: plantaginaceae
Common name(s): scarlet penstemon; Heller's beardtongue
Hardiness ratings: USDA zone 8 - 10 
General resources
Links for Penstemon triflorus
- Dave's Garden PlantFiles - Profile page with horticultural basics, and member-contributed photos and comments. (zone 8-10)
 (10 photos)
- Garden.org - Community-assembled plant profile (2 photos)
- Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation. (38 photos)
- Native Plant Society of Texas - Plant profile with basic characteristics, some horticultural information, and a distribution map within Texas. (2 photos)
- Native Plants of Central Texas - Photos with brief comments from University of Texas at Austin. (6 photos)
- Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records. (4 photos)
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