Taxon Report

Navarretia gowenii L.A. Johnson

Lime Ridge navarretia

Print Report

Taxon Summary

Navarretia gowenii, commonly known as Lime Ridge navarretia, is a annual herb in the Polemoniaceae that is found only in California. It occurs within Chaparral, growing at elevations from 180 to 305 meters. Navarretia gowenii is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Navarretia gowenii L.A. Johnson
Common Name:	Lime Ridge navarretia
Family:	Polemoniaceae
Element Code:	PDPLM0C120
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: May-Jun	May-Jun
Elevation:	180-305 (590-1000)
General Habitats:	Chaparral
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G1
State Rank:	S1
State List:	None
Fed List:	None
Other Status:	SB_UCBG
CRPR Changes:	added to 1B.1 on 2008-05-15

Occurrence Data from the CNDDB


Total Occurrences:	3
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	3

Location


California Endemic: True
California Counties and Islands: Name (Code)
Contra Costa (CCA), Stanislaus (STA)
Quads: Name (Quad Code)
Clayton (3712188), Crevison Peak (3712122)

Threat List Data from the CNDDB


Threat List Total:	3
EOs with Threat Listed:	Total EOs	% of EOs
	2	67 %
Recreational use (non-ORV)	2	66%
Wood cutting or brush clearing	1	33%
Other	1	33%

Notes



Known from only four occurrences. Possibly threatened by recreational activities. Potentially threatened by radio tower maintenance and associated vegetation management. Not in The Jepson Manual (1993). See Novon 17(4): 454-461 (2007) for original description.
Threats:

Taxonomy:

Selected References

CRPR List Addition on 2008-05-15

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].