Taxon Report

Phacelia cookei Const. & Heckard

Cooke's phacelia

Print Report


© 1992 Dean Wm. Taylor

Taxon Summary

Phacelia cookei, commonly known as Cooke's phacelia, is a annual herb in the Hydrophyllaceae that is found only in California. It occurs within Great Basin scrub, and Lower montane coniferous forest, growing at elevations from 1095 to 1700 meters. Phacelia cookei is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

  Classification
Scientific Name:
 Phacelia cookei Const. & Heckard
Common Name:
 Cooke's phacelia
Family: Hydrophyllaceae
Element Code: PDHYD0C0Y0
USDA Plants Symbol: PHCO20
Synonyms/Other Names:

Ecology and Life History
Lifeform: annual herb
Blooming Period: Jun-Jul Jun-Jul
Elevation: 1095-1700 (3595-5580)
General Habitats: Great Basin scrub, Lower montane coniferous forest
Microhabitat: Sandy, Volcanic
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 1B.1
Global Rank: G1
State Rank:
 S1
State List: None
Fed List: None
Other Status: BLM_S; SB_BerrySB; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB
Total Occurrences: 6
Element Occurrence Ranks:
   Excellent (A) 1
   Good (B) 0
   Fair (C) 0
   Poor (D) 0
   None (X) 0
   Unknown (U) 5

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Siskiyou (SIS)
Quads: Name (Quad Code)
Juniper Flat (4112253), The Whaleback (4112252)

Threat List Data from the CNDDB

Threat List Total: 4
EOs with Threat Listed: Total EOs % of EOs
5 83 %
Other 4 66%
Road/trail construction/maint. 1 16%
Biocides 1 16%
Non-native plant impacts 1 16%

Notes
Known from fewer than five occurrences. Threatened by non-native plants, and possibly by fire suppression. See Brittonia 22(1):25-30 (1970) for original description.
Threats:
Taxonomy:

Selected References

USFS Potential Species of Conservation Concern Profile
Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 January 2025].