Taxon Report

Navarretia prostrata (Gray) Greene

prostrate vernal pool navarretia

Print Report


Taxon Summary

Navarretia prostrata, commonly known as prostrate vernal pool navarretia, is a annual herb in the Polemoniaceae that is found only in California. It occurs within Coastal scrub, Meadows and seeps, Valley and foothill grassland (alkaline), and Vernal pools, growing at elevations from 3 to 1210 meters. Navarretia prostrata is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

  Classification
Scientific Name:
 Navarretia prostrata (Gray) Greene
Common Name:
 prostrate vernal pool navarretia
Family: Polemoniaceae
Element Code: PDPLM0C0Q0
USDA Plants Symbol: NAPR2
Synonyms/Other Names:

Ecology and Life History
Lifeform: annual herb
Blooming Period: Apr-Jul Apr-Jul
Elevation: 3-1210 (10-3970)
General Habitats: Coastal scrub, Meadows and seeps, Valley and foothill grassland, Vernal pools
Microhabitat: Mesic
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 1B.2
Global Rank: G2
State Rank:
 S2
State List: None
Fed List: None
Other Status: BLM_S
CRPR Changes:
  • changed from 1B.1 to 1B.2 on 2019-08-27

Occurrence Data from the CNDDB
Total Occurrences: 61
Element Occurrence Ranks:
   Excellent (A) 3
   Good (B) 9
   Fair (C) 2
   Poor (D) 0
   None (X) 9
   Unknown (U) 38

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Alameda (ALA), Fresno (FRE), Los Angeles (LAX), Merced (MER), Monterey (MNT), Orange (ORA), Riverside (RIV), San Benito (SBT), San Bernardino (SBD)(?), San Diego (SDG), San Luis Obispo (SLO)
Quads: Name (Quad Code)
Arena (3712036), Bradley (3512077), Bryson (3512171), Guasti (3411715)(?), Gustine (3712038), Hames Valley (3512088), Hepsedam Peak (3612037), Hernandez Reservoir (3612047), Hollywood (3411813), Idria (3612046), Inglewood (3311883), Joaquin Rocks (3612034), Jolon (3512182), La Jolla (3211772), La Mesa (3211771), Laguna Beach (3311757), Livermore (3712167), Long Beach (3311872), Los Angeles (3411812)(?), Los Banos (3712017), Milpitas (3712148), Murrieta (3311752), National City (3211761), Newport Beach (3311768), Ontario (3411716)(?), Rock Spring Peak (3612048), San Clemente (3311745), San Felipe (3612184), San Luis Ranch (3712027), Santa Rita Peak (3612035), South Gate (3311882), Stevinson (3712037), Tierra Redonda Mountain (3512078), Torrance (3311873), Turner Ranch (3712026), Venice (3311884), Whittier (3311881), Wildomar (3311753), Williams Hill (3512181)

Threat List Data from the CNDDB

Threat List Total: 16
EOs with Threat Listed: Total EOs % of EOs
45 74 %
Non-native plant impacts 25 40%
Grazing 24 39%
Road/trail construction/maint. 16 26%
Feral pigs 10 16%
Development 9 14%
Other 8 13%
ORV activity 6 9%
Foot traffic/trampling 6 9%
Military operations 6 9%
Erosion/runoff 2 3%
Altered flood/tidal/hydrologic regime 1 1%
Dam/Inundation 1 1%
Mining 1 1%
Recreational use (non-ORV) 1 1%
Vandalism/dumping/litter 1 1%
Wood cutting or brush clearing 1 1%

Notes
Threatened by development, vehicles, road maintenance, grazing, non-native plants, and feral pigs. See Proceedings of the American Academy of Arts and Sciences 17:223 (1881) for original description, and Pittonia 1:130 (1887) for revised nomenclature.
Threats:
Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 30 January 2025].