Penstemon diphyllus
| Penstemon diphyllus | |
|---|---|
 | |
| In Frank Church–River of No Return Wilderness | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Embryophytes |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Lamiales |
| Family: | Plantaginaceae |
| Genus: | Penstemon |
| Species: | P. diphyllus |
| Binomial name | |
| Penstemon diphyllus | |
| Synonyms[2] | |
| |
Penstemon diphyllus, the twin-leaved penstemon, is a species in the veronica family from the northwestern United States in Washington, Idaho, and Montana.
Taxonomy
Penstemon diphyllus was scientifically described and named in 1900 by Per Axel Rydberg. He placed the species in the Penstemon genus which is classified in the Plantaginaceae family. Though listed as an accepted species by Plants of the World Online, it was described as a subspecies of Penstemon triphyllus by David D. Keck in 1932. The species has no subspecies.[2]
Names
Penstemon diphyllus is known by the common names twin-leaved penstemon,[3] twoleaf beardtongue,[1] and less frequently mintleaf penstemon.[4]
Range and habitat
Twin-leaved penstemons are native to the US states of Washington, Idaho, and Montana.[2] In Washington state it is only recorded as occurring in Whitman County on the eastern edge of the state. It grows in many of the counties in central Idaho, but only in counties along the Western edge of Montana.[5] It occurs at elevations of 1,000 to 2,300 meters (3,300–7,500 ft).[6]
See also
References
Citations
- 1 2 NatureServe 2026.
- 1 2 3 POWO 2026.
- ↑ Earle & Lundin 2012, p. 206.
- ↑ Kelsey & Dayton 1942, p. 473.
- ↑ NRCS 2026.
- ↑ Freeman 2020.
Sources
Books
- Earle, A. Scott; Lundin, Jane (2012). Idaho mountain wildflowers : a photographic compendium. Boise, Idaho: Larkspur Books. ISBN 978-0-615-58854-4. OCLC 815681985.
- Kelsey, Harlan P.; Dayton, William A., eds. (1942). Standardized Plant Names: A Revised and Enlarged Listing of Approved Scientific and Common Names of Plants and Plant Products in American Commerce or Use (Second ed.). Harrisburg, Pennsylvania: J. Horace McFarland Company. OCLC 552786. Retrieved 18 July 2026.
Web sources
- Freeman, Craig C. (2020) [In print 2019]. "Penstemon diphyllus". Flora of North America. p. 232. ISBN 978-0-19-086851-2. OCLC 1101573420. Archived from the original on 26 September 2022. Retrieved 18 July 2026.
{{cite web}}: CS1 maint: periodical has ISBN (link) - NatureServe (2 July 2026). "Penstemon diphyllus". NatureServe Explorer. Arlington, Virginia. Retrieved 18 July 2026.
- NRCS (2026). "Plants Database". United States Department of Agriculture (USDA). Retrieved 17 July 2026.
- POWO (2026). "Penstemon diphyllus Rydb". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 18 July 2026.
External links
