LITERATURE CITED
- Bitancourt, A. A., and A. E. Jenkins. 1942. New discoveries of Myriangiales in the Americas. Proc. Amer. Sci. Cong., 8th, Washington 1940 3: 161.
- English, Carl S., Jr. 1947. A hybrid Penstemon for the rock garden. Rock Garden Notes. Nat. Hort. Mag. 26: 105–108.