Taxon Report

Dudleya attenuata (S. Watson) Moran ssp. attenuata

Orcutt's dudleya

Print Report


Taxon Summary

Dudleya attenuata ssp. attenuata, commonly known as Orcutt's dudleya, is a perennial herb in the Crassulaceae that is found in California and elsewhere. It occurs within Chaparral, Coastal bluff scrub, and Coastal scrub, growing at elevations from 3 to 50 meters. Dudleya attenuata ssp. attenuata is ranked 2B.1, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Seriously threatened in California.

  Classification
Scientific Name:
 Dudleya attenuata (S. Watson) Moran ssp. attenuata
Common Name:
 Orcutt's dudleya
Family: Crassulaceae
Element Code: PDCRA04032
USDA Plants Symbol:
Synonyms/Other Names:
  • Dudleya attenuata ssp. orcuttii

Ecology and Life History
Lifeform: perennial herb
Blooming Period: May-Jul May-Jul
Elevation: 3-50 (10-165)
General Habitats: Chaparral, Coastal bluff scrub, Coastal scrub
Microhabitat: Gravelly (sometimes), Rocky (sometimes)
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 2B.1
Global Rank: G4T1T2
State Rank:
 S1
State List: None
Fed List: None
Other Status: SB_CalBG/RSABG
CRPR Changes:
  • changed from 2.1 to 2B.1 on 2013-06-12

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

Location
California Endemic:  False
California Counties and Islands: Name (Code)
San Diego (SDG)
Quads: Name (Quad Code)
Imperial Beach (3211751)

Threat List Data from the CNDDB

Threat List Total: 5
EOs with Threat Listed: Total EOs % of EOs
1 100 %
Development 1 100%
Foot traffic/trampling 1 100%
Military operations 1 100%
Recreational use (non-ORV) 1 100%
Road/trail construction/maint. 1 100%

Notes
Known in CA only from Border Field SP. Possibly threatened by trampling and Border Patrol activities. See Bulletin of the New York Botanical Garden 3:36 (1903) for original description.
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 29 October 2025].