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Home/Species/ Piute Mountains Navarretia

Navarretia setiloba

Coville

Piute Mountains Navarretia

G2Imperiled Found in 1 roadless area NatureServe Explorer →
G2ImperiledGlobal Rank
HighThreat Impact
Identity
Unique IDELEMENT_GLOBAL.2.143983
Element CodePDPLM0C0S0
Record TypeSPECIES
ClassificationSpecies
Classification StatusStandard
Name CategoryVascular Plant
Endemicendemic to a single state or province
KingdomPlantae
PhylumAnthophyta
ClassDicotyledoneae
OrderSolanales
FamilyPolemoniaceae
GenusNavarretia
Concept Reference
Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
Conservation Status
Rank Method Rank calculation - Biotics v2
Review Date2026-03-04
Change Date2013-08-20
Edition Date2026-03-04
Edition AuthorsBittman, R.L., rev. R. Bittman 2005, rev. Soteropoulos (2026)
Threat ImpactHigh
Range Extent5000-20,000 square km (about 2000-8000 square miles)
Number of Occurrences21 - 80
Rank Reasons
Navarretia setiloba is an annual herb found in depressions in clay or gravelly loam soils in valley and foothill grassland, oak foothill and cismontane woodlands, oak savanna, montane hardwood-conifer woodland, and pinyon-juniper woodland. It is endemic to the western United States in southwestern California, primarily in Kern County but also in Los Angeles and Tulare counties in the southern Sierra Nevada Foothills, northern Western Transverse Ranges (San Emigdio Mountains and Tehachapi Mountains), and adjacent southern San Joaquin Valley. There are an estimated 35 occurrences, which face threats from residential development, cattle and horse grazing, nonnative wild boar impacts, road construction and maintenance activities, and recreational activities. Monitoring of populations should be conducted to improve our understanding of reproduction, plant abundance, threats, and trends, as well as continuing conservation measures to protect the taxon.
Range Extent Comments
Navarretia setiloba is endemic to the western United States in southwestern California, primarily in Kern County but also in Los Angeles and Tulare counties in the southern Sierra Nevada Foothills, northern Western Transverse Ranges (San Emigdio Mountains and Tehachapi Mountains), and adjacent southern San Joaquin Valley (Jepson Flora Project 2026). Range extent was estimated to be 5874 square kilometers using herbarium specimens, photo-based observations, and NatureServe Network occurrence data documented between 1994 and 2025 (RARECAT 2025, GBIF 2026, iNaturalist 2026, NatureServe 2026, SEINet 2026).
Occurrences Comments
By applying a 1 km separation distance to herbarium specimens, photo-based observations, and NatureServe Network occurrence data documented between 1994 and 2025, it is estimated that there are 35 occurrences rangewide (RARECAT 2025, GBIF 2026, iNaturalist 2026, NatureServe 2026, SEINet 2026). CNPS (2026) estimates that there are 55 occurrences presumed extant, including thirteen occurrences that have not been observed for over 20 years, noting "Many historical occurrences have been searched without success."
Threat Impact Comments
This species is threatened by residential development, cattle and horse grazing, nonnative wild boar impacts, road construction and maintenance activities, and recreational activities, including trampling from foot traffic and off-road vehicle activity (CNPS 2026, NatureServe 2026).
Ecology & Habitat

Habitat

Navarretia setiloba grows in depressions in clay or gravelly loam soils in valley and foothill grassland, oak foothill and cismontane woodlands, oak savanna, montane hardwood-conifer woodland, and pinyon-juniper woodland (CNPS 2026, Jepson Flora Project 2026).

Reproduction

This species flowers from April to July (Jepson Flora Project 2026).
Terrestrial Habitats
Woodland - HardwoodWoodland - ConiferWoodland - MixedSavannaGrassland/herbaceous
Other Nations (1)
United StatesN2
ProvinceRankNative
CaliforniaS2Yes
Threat Assessments
ThreatScopeSeverityTiming
1 - Residential & commercial developmentRestricted (11-30%)Extreme - seriousHigh (continuing)
1.1 - Housing & urban areasRestricted (11-30%)Extreme - seriousHigh (continuing)
2 - Agriculture & aquacultureRestricted (11-30%)Moderate or 11-30% pop. declineHigh (continuing)
2.3 - Livestock farming & ranchingRestricted (11-30%)Moderate or 11-30% pop. declineHigh (continuing)
4 - Transportation & service corridorsRestricted (11-30%)Moderate or 11-30% pop. declineHigh (continuing)
4.1 - Roads & railroadsRestricted (11-30%)Moderate or 11-30% pop. declineHigh (continuing)
6 - Human intrusions & disturbanceRestricted (11-30%)Moderate or 11-30% pop. declineHigh (continuing)
6.1 - Recreational activitiesRestricted (11-30%)Moderate or 11-30% pop. declineHigh (continuing)
8 - Invasive & other problematic species, genes & diseasesSmall (1-10%)Extreme or 71-100% pop. declineHigh (continuing)
8.1 - Invasive non-native/alien species/diseasesSmall (1-10%)Extreme or 71-100% pop. declineHigh (continuing)
8.1.2 - Named speciesSmall (1-10%)Extreme or 71-100% pop. declineHigh (continuing)

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Plant Characteristics
DurationANNUAL
Economic Value (Genus)No
Roadless Areas (1)
California (1)
AreaForestAcres
Mill CreekSequoia National Forest27,643
References (11)
  1. Bittman, Roxanne. Personal Communication. Botanist, California Natural Diversity Database, Sacramento, Calif.
  2. California Native Plant Society (CNPS), Rare Plant Program. 2026. Inventory of Rare and Endangered Plants of California, online edition, v9.5. Online. Available: https://www.rareplants.cnps.org (accessed 2026).
  3. Global Biodiversity Information Facility (GBIF). 2026. Global Biodiversity Information Facility (GBIF) data portal. Online. Available: https://www.gbif.org/ (accessed 2026).
  4. Hickman, J. C., ed. 1993. The Jepson manual: Higher plants of California. University of California Press, Berkeley, CA. 1400 pp.
  5. Jepson Flora Project (eds.) 2026. Jepson eFlora. Online. Available: https://ucjeps.berkeley.edu/eflora/ (accessed 2026).
  6. Kartesz, J.T. 1994. A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.
  7. NatureServe. 2026. NatureServe Network Biodiversity Location Data. NatureServe, Arlington, Virginia.
  8. <p>NatureServe's Rapid Analysis of Rarity and Endangerment Conservation Assessment Tool (RARECAT). 2025. Version: 2.1.1 (released April 04, 2025).</p>
  9. Southwest Environmental Information Network (SEINet). 2026. Collections Databases. Online. Available: https://swbiodiversity.org/seinet/collections/index.php (accessed 2026).
  10. U.S. Fish and Wildlife Service (USFWS). 1994. Proposed endangered or threatened status for 10 plants from the foothills of the Sierra Nevada Mountains in California. Federal Register 59(191): 50540-50550.
  11. U.S. Fish and Wildlife Service (USFWS). 1998. Endangered and threatened wildlife and plants: withdrawal of proposed listing of two plants as endangered, and four plants as threatened from the foothills of the Sierra Nevada Mountains in California. Federal Register 63(177):49065-49075. Online. Available: https://www.federalregister.gov/d/98-24501 (Accessed 2024).