Taxon Report
Eriastrum densifolium (Benth.) Mason ssp. sanctorum (Mlkn.) MasonSanta Ana River woollystar |
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Taxon Summary
Eriastrum densifolium ssp. sanctorum, commonly known as Santa Ana River woollystar, is a perennial herb in the Polemoniaceae that is found only in California. It occurs within Chaparral, and Coastal scrub (alluvial fans), growing at elevations from 91 to 610 meters. Eriastrum densifolium ssp. sanctorum is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Eriastrum densifolium (Benth.) Mason ssp. sanctorum (Mlkn.) Mason |
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Common Name: |
Santa Ana River woollystar |
| Family: | Polemoniaceae |
| Element Code: | PDPLM03035 |
| USDA Plants Symbol: | ERDES |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial herb |
| Blooming Period: Apr-Sep | Apr-Sep |
| Elevation: | 91-610 (300-2000) |
| General Habitats: | Chaparral, Coastal scrub |
| Microhabitat: | Gravelly (sometimes), Sandy (sometimes) |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G4T1 |
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State Rank: |
S1 |
| State List: | CE |
| Fed List: | FE |
| Other Status: | SB_CalBG/RSABG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 32 |
| Element Occurrence Ranks: | |
| Excellent (A) | 2 |
| Good (B) | 4 |
| Fair (C) | 11 |
| Poor (D) | 5 |
| None (X) | 4 |
| Unknown (U) | 6 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Orange (ORA)*, Riverside (RIV), San Bernardino (SBD) | |
| Quads: Name (Quad Code) | |
| Black Star Canyon (3311776)*, Corona North (3311785), Devore (3411724)*, Fontana (3411714), Forest Falls (3411618), Keller Peak (3411721), Orange (3311777), Prado Dam (3311786), Redlands (3411712), Riverside West (3311784), San Bernardino North (3411723), San Bernardino South (3411713), Yorba Linda (3311787), Yucaipa (3411711) | |
Threat List Data from the CNDDB
| Threat List Total: | 21 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 30 | 94 % | |
| ORV activity | 15 | 46% |
| Development | 13 | 40% |
| Other | 10 | 31% |
| Altered flood/tidal/hydrologic regime | 9 | 28% |
| Foot traffic/trampling | 8 | 25% |
| Vandalism/dumping/litter | 7 | 21% |
| Recreational use (non-ORV) | 6 | 18% |
| Hybridization | 6 | 18% |
| Mining | 5 | 15% |
| Road/trail construction/maint. | 5 | 15% |
| Non-native plant impacts | 4 | 12% |
| Dam/Inundation | 4 | 12% |
| Grazing | 3 | 9% |
| Disking | 3 | 9% |
| Improper burning regime | 2 | 6% |
| Waterway bank protection/maintenance | 2 | 6% |
| Wood cutting or brush clearing | 1 | 3% |
| Surface water diversion | 1 | 3% |
| Agriculture | 1 | 3% |
| Biocides | 1 | 3% |
| Channelization | 1 | 3% |
Notes
| Threatened by development, vehicles, foot traffic, sand and gravel mining, hydrological alterations, illegal dumping, road construction, flood control projects, and non-native plants. See Crossosoma 10(5):1-8 (1984) and Fremontia 13(3):19-20 (1985) for species accounts, Fremontia 17(3):20-21 (1989) for discussion of ecology, Systematic Botany 23(3):351-368 (1999) for taxonomic information, and Madroño 50(2):101-109 (2003) for reproductive biology. |
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Threats: |
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Taxonomy: |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 12 July 2025].