Species Details

Hosackia yollabolliensis

Yolla Bolly Mtns. bird's-foot trefoil

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Photo of Hosackia yollabolliensis
2013 Shasta-Trinity National Forest
Photo of Hosackia yollabolliensis
©2017 Belinda Lo
Photo of Hosackia yollabolliensis
©2017 Belinda Lo
Scientific Name:
Hosackia yollabolliensis (Munz) D.D. Sokoloff
Common Name:
Yolla Bolly Mtns. bird's-foot trefoil
Family: Fabaceae
Element Code: PDFAB2A1F0
USDA Plants Symbol:
Synonyms/Other Names:
CA Rare Plant Rank: 1B.2
Fed List: None
State List: None
Global Rank: G2
State Rank:
Other Status:
CRPR Changes:
changed from 4.3 to 1B.2 on 2013-08-21
Add Date: 1974-01-01
Date Edited: 2022-03-01
Lifeform: perennial herb
Blooming Period: Jun-Aug
1645 - 2135 meters
5395 - 7005 feet
General Habitat:
  • Meadows and seeps
  • Upper montane coniferous forest (openings)
General Micro Habitat: dry barren exposed slopes
Micro Habitat:
  • Dry
  • Gravelly (often)
  • Slopes
Previously CRPR 4.3; rarer than originally thought. 

Threatened by vehicles, conifer encrouchment, and non-native plants. Potentially threatened by climate shifts. Possibly threatened by trampling and grazing.

Total Occurrences: 11
Element Occurrence Ranks:
0 0 0 0 0 11
Occurrence Status:
Historical >20 Years 6
Recent <=20 Years 5
Presumed Extant 11
Possibly Extirpated 0
Presumed Extirpated 0
California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Humboldt (HUM), Trinity (TRI)
Quads: Name (Quad Code)
Black Rock Mtn. (4012321), Blake Mountain (4012355), Dinsmore (4012345), Forest Glen (4012333), Hyampom (4012354), North Yolla Bolly (4012228), Sims Mountain (4012365), Sportshaven (4012344)
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
CNPS Status Review: Proposed Change from California Rare Plant Rank 4.3, G3 / S3.3 to 1B.2, G2 / S2
Original Description: Aliso 3:117 (1955)
Revised Nomenclature: Kew Bulletin 55(4):1010 (2000) 
Species Account: Hosackia yollabolliensis profile for potential Species of Conservation Concern evaluation (2022)