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‘The Royal Horticultural Society Horticultural Database’, available at www.rhs.org.ukPenstemon isophyllus 
(H3) 1993
- Status of name
- Tentatively accepted name (Plantaginaceae)
- Type of plant
- Herbaceous perennial
- Description
-
Upright woody-based perennial to 70cm tall, with narrow evergreen leaves and one-sided panicles of slender, tubular, bright reddish-pink flowers 3-4cm long, streaked with crimson in the paler throat
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