Taxon Report

Erythranthe serpentinicola D. J. Keil

Irish Hills monkeyflower

Print Report

Taxon Summary

Erythranthe serpentinicola, commonly known as Irish Hills monkeyflower, is a annual herb in the Phrymaceae that is found only in California. It occurs within Chaparral (openings), and Meadows and seeps (edges), growing at elevations from 60 to 360 meters. Erythranthe serpentinicola is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Erythranthe serpentinicola D. J. Keil
Common Name:	Irish Hills monkeyflower
Family:	Phrymaceae
Element Code:	PDPHR01290
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Feb-May	Feb-May
Elevation:	60-360 (195-1180)
General Habitats:	Chaparral, Meadows and seeps
Microhabitat:	Mesic, Openings, Rocky, Serpentine
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G1
State Rank:	S1
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	added to 1B.1 on 2022-03-30

Occurrence Data from the CNDDB


Total Occurrences:	10
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	1
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	9

Location


California Endemic: False
California Counties and Islands: Name (Code)
San Luis Obispo (SLO)
Quads: Name (Quad Code)
Morro Bay South (3512037), Pismo Beach (3512026), San Luis Obispo (3512036), Santa Margarita Lake (3512034)

Threat List Data from the CNDDB


Threat List Total:	2
EOs with Threat Listed:	Total EOs	% of EOs
	1	10 %
Foot traffic/trampling	1	10%
Other	1	10%

Notes




Threats:
Potentially threatened by foot traffic, grazing, and changes to land use.
Taxonomy:
Similar to E. pardalis of the Sierra Nevada foothills.

Selected References

Proposed Addition to California Rare Plant Rank 1B.1, G1 / S1 (2022)

Phytoneuron 33: 1-13 (2020)

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 5 November 2025].