Taxon Report

Navarretia leucocephala Benth. ssp. bakeri (Mason) A.G. Day

Baker's navarretia

Print Report


© 2018 Barry Rice

Taxon Summary

Navarretia leucocephala ssp. bakeri, commonly known as Baker's navarretia, is a annual herb in the Polemoniaceae that is found only in California. It occurs within Cismontane woodland, Lower montane coniferous forest, Meadows and seeps, Valley and foothill grassland, and Vernal pools, growing at elevations from 5 to 1740 meters. Navarretia leucocephala ssp. bakeri is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

  Classification
Scientific Name:
 Navarretia leucocephala Benth. ssp. bakeri (Mason) A.G. Day
Common Name:
 Baker's navarretia
Family: Polemoniaceae
Element Code: PDPLM0C0E1
USDA Plants Symbol: NALEB
Synonyms/Other Names:

Ecology and Life History
Lifeform: annual herb
Blooming Period: Apr-Jul Apr-Jul
Elevation: 5-1740 (15-5710)
General Habitats: Cismontane woodland, Lower montane coniferous forest, Meadows and seeps, Valley and foothill grassland, Vernal pools
Microhabitat: Mesic
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 1B.1
Global Rank: G4T2
State Rank:
 S2
State List: None
Fed List: None
Other Status: BLM_S; SB_CalBG/RSABG
CRPR Changes:

Occurrence Data from the CNDDB
Total Occurrences: 64
Element Occurrence Ranks:
   Excellent (A) 5
   Good (B) 8
   Fair (C) 3
   Poor (D) 0
   None (X) 10
   Unknown (U) 38

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Colusa (COL), Glenn (GLE), Humboldt (HUM), Lake (LAK), Lassen (LAS), Marin (MRN), Mendocino (MEN), Napa (NAP), Solano (SOL), Sonoma (SON), Sutter (SUT), Tehama (TEH), Yolo (YOL)
Quads: Name (Quad Code)
Allendale (3812148), Arbuckle (3912211), Balls Ferry (4012242), Bend (4012232), Birds Landing (3812127), Blocksburg (4012336), Calistoga (3812255), Clearlake Highlands (3812286), Denverton (3812128), Dozier (3812137), Dunnigan (3812188), Elmira (3812138), Fairfield North (3812231), Gridley (3912136), Grimes (3912118), Healdsburg (3812257), Kenwood (3812245), Kirkwood (3912272), Laughlin Range (3912333), Longvale (3912354), Lower Lake (3812285), Manor Slough (3912223), Mark West Springs (3812256), Middletown (3812275), Owl Creek (4012358), Pennington (3912137), Petaluma River (3812225), Pine Creek Valley (4012151), Redwood Valley (3912332), Santa Rosa (3812246), Saxon (3812146), Sebastopol (3812247), Sherwood Peak (3912355), St. Helena (3812254), Sutter (3912126), Sutter Buttes (3912127), Tuscan Buttes Ne (4012241), Ukiah (3912322), Whispering Pines (3812276), Wildwood School (3812281), Willits (3912343), Willows (3912252), Winters (3812158), Yager Junction (4012357)

Threat List Data from the CNDDB

Threat List Total: 12
EOs with Threat Listed: Total EOs % of EOs
27 42 %
Development 10 15%
Grazing 9 14%
Agriculture 8 12%
Other 5 7%
Non-native plant impacts 4 6%
Foot traffic/trampling 3 4%
Road/trail construction/maint. 3 4%
Surface water diversion 2 3%
ORV activity 2 3%
Recreational use (non-ORV) 2 3%
Feral pigs 1 1%
Vandalism/dumping/litter 1 1%

Notes
May be more widespread; need information. Need quads for COL Co.
Threats:

Threatened by development, habitat alteration, road construction, and agriculture. Potentially threatened by non-native plants.
Taxonomy:

Selected References

Madroño 8(6):198 (1946)
Novon 3(4):331-340 (1993)
Navarretia leucocephala ssp. bakeri profile for potential Species of Conservation Concern evaluation (2018)
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].