Penstemon laetus var. laetus
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- Introduced into cultivation in California by Theodore Payne.
- From California Native Plants, Theodore Payne's 1941 catalog: Grows 1 to 2 feet high with rather narrow foliage; flowers rich blue or bluish purple. Gallon cans, 35c."
- Bornstein, Carol, David Fross, and Bart O'Brien. California Native Plants for the Garden. Los Olivos, CA: Cachuma Press. 2005.