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Abstract
Thickleaf beardtongue has a limited distribution, occurring in Utah, east-central Nevada, and northern Arizona. Reports of the species in Wyoming and Colorado are likely referring to mucronate penstemon (Penstemon mucronatus), which was considered a thickleaf beardtongue variety by some taxonomists. Variety pachyphyllus occurs in Carbon, Daggett, Duchesne, Uinta, and Wasatch Counties of Utah. Variety congestus occurs from the calcareous region of east-central Nevada to the Unita Basin in northeastern Utah, and through the Grand Canyon Plateau of northern Arizona (Freeman 2019). Holmgren (1978) reports variety congestus in the White Pine, Egan, Schell Creek, and Snake Ranges of east-central Nevada, and the Wah Wah and Pine Valley Mountains of south-central Utah above 6,600 ft (2,000 m) (Holmgren 1978). This includes White Pine County in Nevada, Tooele, Millard, Beaver, Iron, Washington, Kane, San Juan, Garfield, Piute, Wayne, Sevier, Emery, Sanpete, and Carbon Counties in Utah, and Mohave and Coconino Counties in Arizona.
Parent Publication
Citation
Gucker, Corey L.; Shaw, Nancy L. 2022. Thickleaf beardtongue (Penstemon pachyphyllus). In: Gucker, C.L.; Shaw, N.L., eds. Western forbs: Biology, ecology, and use in restoration. Reno, NV: Great Basin Fire Science Exchange. Online: https://westernforbs.org/species/thickleaf-beardtongue-penstemon-pachyphyllus/.
