Taxon Report
Dudleya chasmophyta S. McCabeSantiago Canyon dudleya |
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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
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Scientific Name: |
Dudleya chasmophyta S. McCabe |
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Common Name: |
Santiago Canyon dudleya |
| Family: | Crassulaceae |
| Element Code: | PDCRA04150 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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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 |
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State Rank: |
S1 |
| State List: | None |
| Fed List: | None |
| Other Status: | |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 1 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 1 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 0 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Orange (ORA) | |
| Quads: Name (Quad Code) | |
| Santiago Peak (3311765) | |
Threat List Data from the CNDDB
| Threat List Total: | 5 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 1 | 100 % | |
| Erosion/runoff | 1 | 100% |
| Improper burning regime | 1 | 100% |
| Insufficient population/stand size | 1 | 100% |
| Other | 1 | 100% |
| Over-collecting/poaching | 1 | 100% |
Notes
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Threats: |
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Potentially threatened by fire, erosion, herbivores, horticultural collecting, and loss of pollinators. |
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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 27 October 2025].