Common name(s): whorled penstemon
Links for Penstemon triphyllus
- American Penstemon Society - Detailed description of the species' botanical characteristics, habitat, and native range. (1 photo)
- Lady Bird Johnson Wildflower Center - Plant description and characteristics with notes on distribution, culture, and propagation.
- Rob's Plants - Plant profile with basic horticultural information and often personal observations. Also seed germination records.