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

Apparently Secure  (NatureServe)
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Lamiales
Family: Plantaginaceae
Genus: Penstemon
Species:
P. filiformis
Binomial name
Penstemon filiformis

References

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  1. ^ "Penstemon filiformis (D.D.Keck) D.D.Keck". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 4 August 2023.
  2. ^ a b "Penstemon filiformis". The Jepson Herbarium. University of California, Berkeley. 2023. Retrieved 4 August 2023.
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