Taxon Report

Dudleya abramsii Rose ssp. murina (Eastw.) Moran

mouse-gray dudleya

Print Report

Chris Winchell

Taxon Summary

Dudleya abramsii ssp. murina, commonly known as mouse-gray dudleya, is a perennial leaf in the Crassulaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, and Valley and foothill grassland, growing at elevations from 90 to 525 meters. Dudleya abramsii ssp. murina is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Dudleya abramsii Rose ssp. murina (Eastw.) Moran
Common Name:	mouse-gray dudleya
Family:	Crassulaceae
Element Code:	PDCRA04012
USDA Plants Symbol:	DUABM
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial leaf
Blooming Period: May-Jun	May-Jun
Elevation:	90-525 (295-1725)
General Habitats:	Chaparral, Cismontane woodland, Valley and foothill grassland
Microhabitat:	Serpentine
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G4T2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_CalBG/RSABG
CRPR Changes:	changed from 1B.3 to 1B.1 on 2023-06-02

Occurrence Data from the CNDDB


Total Occurrences:	36
Element Occurrence Ranks:
Excellent (A)	4
Good (B)	13
Fair (C)	4
Poor (D)	2
None (X)	0
Unknown (U)	13

Location


California Endemic: True
California Counties and Islands: Name (Code)
San Luis Obispo (SLO)
Quads: Name (Quad Code)
Arroyo Grande NE (3512025), Atascadero (3512046), Cayucos (3512048), Lopez Mtn. (3512035), Morro Bay North (3512047), Morro Bay South (3512037), Pismo Beach (3512026), Port San Luis (3512027), San Luis Obispo (3512036), Santa Margarita Lake (3512034)

Threat List Data from the CNDDB


Threat List Total:	12
EOs with Threat Listed:	Total EOs	% of EOs
	20	56 %
Grazing	12	33%
Development	7	19%
Non-native plant impacts	4	11%
Road/trail construction/maint.	4	11%
Other	3	8%
Feral pigs	3	8%
Improper burning regime	3	8%
Military operations	3	8%
Over-collecting/poaching	2	5%
Mining	1	2%
Foot traffic/trampling	1	2%
Erosion/runoff	1	2%

Notes



Threatened by horticultural collecting and grazing. Potentially threatened by pipeline construction and non-native plants.
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 22 February 2025].