Taxon Report

Navarretia nigelliformis Greene ssp. radians (J.T. Howell) A.G. Day

shining navarretia

Print Report


Species Description:
Navarretia nigelliformis ssp. radians, commonly known as shining navarretia, is a annual herb in the Polemoniaceae that is found only in California. It occurs within Cismontane woodland, Valley and foothill grassland, and Vernal pools, growing at elevations from 65 to 1000 meters. Navarretia nigelliformis ssp. radians is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

  Classification
Scientific Name:
 Navarretia nigelliformis Greene ssp. radians (J.T. Howell) A.G. Day
Common Name:
 shining navarretia
Family: Polemoniaceae
Element Code: PDPLM0C0J2
USDA Plants Symbol: NANIR
Synonyms/Other Names:

Ecology and Life History
Lifeform: annual herb
Blooming Period: (Mar)Apr-Jul (Mar)Apr-Jul
Elevation: 65-1000 (215-3280)
General Habitats: Cismontane woodland, Valley and foothill grassland, Vernal pools
Microhabitat: Clay (sometimes)
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 1B.2
Global Rank: G4T2T3
State Rank:
 S2S3
State List: None
Fed List: None
Other Status: BLM_S
CRPR Changes:

Occurrence Data from the CNDDB
Total Occurrences: 102
Element Occurrence Ranks:
   Excellent (A) 11
   Good (B) 17
   Fair (C) 17
   Poor (D) 2
   None (X) 2
   Unknown (U) 53

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Alameda (ALA), Colusa (COL), Contra Costa (CCA), Fresno (FRE), Madera (MAD), Merced (MER), Monterey (MNT), San Benito (SBT), San Joaquin (SJQ), San Luis Obispo (SLO), Stanislaus (STA), Tulare (TUL)
Quads: Name (Quad Code)
Adelaida (3512067), Antioch South (3712187), Bickmore Canyon (3612152), Bradley (3512077), California Valley (3512031), Cholame (3512063), Cholame Valley (3512073), Ciervo Mtn. (3612045), Clifton Court Forebay (3712175), Cosio Knob (3612112), Creston (3512055), Curry Mountain (3612014), Daulton (3711918), Estrella (3512065), Haystack Mtn. (3712043), Hepsedam Peak (3612037), Hernandez Reservoir (3612047), Idria (3612046), Kismet (3712011), Le Grand (3712022), Lodoga (3912234), Lonoak (3612038), Los Banos Valley (3612181), Mariposa Peak (3612182), Merced (3712034), Midway (3712165), Monarch Peak (3612027), Owens Reservoir (3712032), Parkfield (3512084), Paso Robles (3512066), Patterson (3712142), Planada (3712033), Priest Valley (3612026), Raymond (3711928), Rock Spring Peak (3612048), Salt Canyon (3912213), San Benito (3612151), San Benito Mtn. (3612036), San Miguel (3512076), Santa Margarita (3512045), Shedd Canyon (3512054), Smith Mountain (3612015), Success Dam (3611818), Templeton (3512056), Tent Hills (3512072), The Dark Hole (3512083), Wilbur Springs (3912214), Yosemite Lake (3712044)

Threat List Data from the CNDDB

Threat List Total: 13
EOs with Threat Listed: Total EOs % of EOs
61 60 %
Development 30 29%
Grazing 30 29%
Non-native plant impacts 15 14%
Improper burning regime 10 9%
Military operations 9 8%
Feral pigs 9 8%
Foot traffic/trampling 8 7%
Road/trail construction/maint. 8 7%
Recreational use (non-ORV) 7 6%
ORV activity 7 6%
Erosion/runoff 2 1%
Agriculture 2 1%
Other 1 0%

Notes
Threatened by development. Possibly threatened by grazing and competition from non-native plants. Similar to N. heterandra. See Leaflets of Western Botany 2(8):136 (1938) for original description, and Novon 3(4):331-340 (1993) 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 15 January 2025].