Species Details

Penstemon filiformis

thread-leaved beardtongue

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Photo of Penstemon filiformis
Steve Matson (2015)
Photo of Penstemon filiformis
Steve Matson (2015)
Photo of Penstemon filiformis
Julie Kierstead (2015)
Scientific Name:
Penstemon filiformis (Keck) Keck
Common Name:
thread-leaved beardtongue
Family: Plantaginaceae
Element Code: PDSCR1L2A0
USDA Plants Symbol: PEFI2
Synonyms/Other Names:
CA Rare Plant Rank: 4.2
Fed List: None
State List: None
Global Rank: G4
State Rank:
Other Status:
CRPR Changes:
changed from 1B.3 to 4.2 on 2020-05-07
Add Date: 1974-01-01
Date Edited: 2021-06-03
Lifeform: perennial herb
Blooming Period: May-Aug(Sep)
450 - 1875 meters
1475 - 6150 feet
General Habitat:
  • Cismontane woodland
  • Lower montane coniferous forest
General Micro Habitat:
Micro Habitat:
  • Rocky
  • Serpentinite (often)
Changed from 1B.3 to 4.2 on 2020-05-07
More common than originally known. Possibly threatened by logging, road maintenance, and recreation. Reported to tolerate some types of disturbance. Confused with P. laetus var. sagittatus. See University of California Publications in Botany 16:394 (1932) for original description.
Total Occurrences: 95
Element Occurrence Ranks:
7 45 12 1 0 30
Occurrence Status:
Historical >20 Years 45
Recent <=20 Years 50
Presumed Extant 95
Possibly Extirpated 0
Presumed Extirpated 0
California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Shasta (SHA), Siskiyou (SIS), Trinity (TRI)
Quads: Name (Quad Code)
Caribou Lake (4112218), Carrville (4112216), Chicken Hawk Hill (4112214), Covington Mill (4012287), Damnation Peak (4012285), Dunsmuir (4112223), Lamoine (4012284), Mumbo Basin (4112225), Papoose Creek (4012276), Rush Creek Lakes (4012278), Schell Mtn. (4012275), Seven Lakes Basin (4112224), Siligo Peak (4012288), Tangle Blue Lake (4112226), Tombstone Mtn. (4112213), Trinity Center (4012286), Trinity Dam (4012277), Whisky Bill Peak (4112215), Ycatapom Peak (4112217)
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.


Presumed Extant
Counties   Quads