Taxon Report

Dudleya chasmophyta S. McCabe

Santiago Canyon dudleya

Print Report

Taxon Summary

Dudleya chasmophyta, commonly known as Santiago Canyon dudleya, is a perennial herb in the Crassulaceae that is found only in California. It occurs within Chaparral, and Coastal scrub, growing at elevations from 475 to 515 meters. Dudleya chasmophyta is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Dudleya chasmophyta S. McCabe
Common Name:	Santiago Canyon dudleya
Family:	Crassulaceae
Element Code:	PDCRA04150
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: May-Jun	May-Jun
Elevation:	475-515 (1560-1690)
General Habitats:	Chaparral, Coastal scrub
Microhabitat:	Rocky
Microhabitat Details:	Steep cliffs of conglomerate rock.

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 2024-09-04

Occurrence Data from the CNDDB


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

Location


California Endemic: True
California Counties and Islands: Name (Code)

Quads: Name (Quad Code)

Threat List Data from the CNDDB


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

Notes




Threats:
Potentially threatened by fire, erosion, herbivores, horticultural collecting, and loss of pollinators.
Taxonomy:
Formerly included in D. cymosa ssp. ovatifolia. Distinguished from that taxon by range, peduncle bracts not strongly reflexed, abaxial leaf surfaces green to green-brown, corolla lobes spreading distally, flower throats not constricted or only slightly so, and flower buds broader in the middle. Other similar taxa, D. cymosa sspp. crebrifolia and marcescens, are allopatric.

Selected References

Proposed addition to CRPR 1B.1 G1 / S1 (2024)

Madroño 70(3): 151–157 (2023)

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].