Taxon Report

Dudleya blochmaniae (Eastw.) Moran ssp. insularis Moran

Santa Rosa Island dudleya

Print Report

Taxon Summary

Dudleya blochmaniae ssp. insularis, commonly known as Santa Rosa Island dudleya, is a perennial herb in the Crassulaceae that is found only in California. It occurs within Coastal bluff scrub, growing at elevations from 3 to 10 meters. Dudleya blochmaniae ssp. insularis is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Dudleya blochmaniae (Eastw.) Moran ssp. insularis Moran
Common Name:	Santa Rosa Island dudleya
Family:	Crassulaceae
Element Code:	PDCRA04052
USDA Plants Symbol:	DUBLI
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Mar-Apr	Mar-Apr
Elevation:	3-10 (10-35)
General Habitats:	Coastal bluff scrub
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G2T1
State Rank:	S1
State List:	None
Fed List:	None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB


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

Location


California Endemic: True
California Counties and Islands: Name (Code)
Santa Barbara (SBA)
Quads: Name (Quad Code)
Santa Rosa Island East (3311988)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	%

Notes



Known from only one occurrence near Old Ranch Pt. Population has been fenced as of 1996; still possibly threatened by cattle trampling, grazing by feral herbivores, non-native plants and horticultural collecting.
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 31 January 2025].