Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2024-03-26
Change Date2024-03-26
Edition Date2024-03-26
Edition AuthorsGries, D. (1999), rev. Eberly and Wessel (2024)
Range Extent1000-5000 square km (about 400-2000 square miles)
Number of Occurrences6 - 20
Rank Reasons
Penstemon washingtonensis is a perennial herb of the western United States that is endemic to north-central Washington. It is known from around 11 occurrences on open slopes and meadows at high elevations.
Range Extent Comments
Penstemon washingtonensis occurs in the western United States where it is endemic to north-central Washington in Chelan and Okanogan Counties (Strickler 1997).
Ecology & Habitat
Habitat
This species grows in alpine meadows, on open, rocky slopes and meadows or grassy openings in pine-fir forests at high elevations (1,800-2,300 m) (Strickler 1997, FNA 2019)
Flora of North America Editorial Committee (FNA). 2019. Flora of North America north of Mexico. Vol. 17: Magnoliophyta: Tetrachondraceae to Orobanchaceae. Oxford Univ. Press, New York. xxiv + 737 pp.
Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Strickler, D. 1997. Northwest Penstemons. Flower Press, Columbia Falls, Montana. 191 pp.