Lindgren, D.; Wilde, E. 2003. Growing penstemons: Species, cultivars and hybrids. American Penstemon Society. Haverford, PA: Infinity Publishing Company. 151 p.

Lindgren, D.; Wilde, E. 2003. Growing penstemons: Species, cultivars and hybrids. American Penstemon Society. Haverford, PA: Infinity Publishing Company. 151 p.

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