Penstemon filiformis is an uncommon species of Penstemon known by the common name threadleaf beardtongue.[1][2] It is endemic to the Klamath Mountains of northern California, where it grows in forest and woodland, often on serpentine soils. It is a perennial herb growing up to half a meter tall, its stem hairy and woody toward the base. The leaves are very narrow, linear and rolled to threadlike, reaching up to 7 centimeters long, those low on the plant sometimes borne in clusters. The inflorescence produces hairless, tubular or funnel-shaped blue to purple flowers just over a centimeter in length.[2]
| Penstemon filiformis | |
|---|---|
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Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Lamiales |
| Family: | Plantaginaceae |
| Genus: | Penstemon |
| Species: | P. filiformis
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| Binomial name | |
| Penstemon filiformis | |
References
edit- ^ "Penstemon filiformis (D.D.Keck) D.D.Keck". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 4 August 2023.
- ^ a b "Penstemon filiformis". The Jepson Herbarium. University of California, Berkeley. 2023. Retrieved 4 August 2023.
External links
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