Penstemon clutei is a species of flowering plant in the plantain family known by the common name Sunset Crater beardtongue. It is endemic to Arizona, where it is known only from a system of volcanic cinder cones, including Sunset Crater, in Coconino County.
This plant grows only on volcanic fields around Sunset Crater in one Arizona county. It grows in openings and around Ponderosa pines. It is a fire-adapted species. It may be threatened by off-road vehicle use and by hybridization with other Penstemon.
- Penstemon clutei. Center for Plant Conservation.
- Penstemon clutei. The Nature Conservancy.
- Fulé, P. Z., et al. Response of a Rare Endemic, Penstemon clutei, to Burning and Reduced Belowground Competition. Southwestern rare and endangered plants: proceedings of the third conference; September 25-28; Flagstaff, AZ. In: Maschinski, Joyce; Holter, Louella, editors. 2000. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. Fort Collins, CO (Proceedings RMRS-P-23). p 139-152.
- Springer, J. D., et al. Population structure and genetic variability of Sunset Crater Beardtongue (Penstemon clutei). February 28, 2010.