Taxon Report
Deinandra minthornii (Jeps.) B.G. BaldwinSanta Susana tarplant |
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Taxon Summary
Deinandra minthornii, commonly known as Santa Susana tarplant, is a perennial deciduous shrub in the Asteraceae that is found only in California. It occurs within Chaparral, and Coastal scrub, growing at elevations from 280 to 760 meters. Deinandra minthornii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.Classification
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Scientific Name: |
Deinandra minthornii (Jeps.) B.G. Baldwin |
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Common Name: |
Santa Susana tarplant |
| Family: | Asteraceae |
| Element Code: | PDAST4R0J0 |
| USDA Plants Symbol: | DEMI4 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial deciduous shrub |
| Blooming Period: Jul-Nov | Jul-Nov |
| Elevation: | 280-760 (920-2495) |
| General Habitats: | Chaparral, Coastal scrub |
| Microhabitat: | Rocky |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G2 |
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State Rank: |
S2 |
| State List: | CR |
| Fed List: | None |
| Other Status: | BLM_S; SB_CalBG/RSABG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 35 |
| Element Occurrence Ranks: | |
| Excellent (A) | 5 |
| Good (B) | 9 |
| Fair (C) | 3 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 18 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Los Angeles (LAX), Ventura (VEN) | |
| Quads: Name (Quad Code) | |
| Calabasas (3411826), Canoga Park (3411825), Malibu Beach (3411816), Oat Mountain (3411835), Point Dume (3411817), Santa Susana (3411836), Thousand Oaks (3411827), Topanga (3411815), Triunfo Pass (3411818) | |
Threat List Data from the CNDDB
| Threat List Total: | 10 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 18 | 51 % | |
| Development | 12 | 34% |
| Road/trail construction/maint. | 6 | 17% |
| Wood cutting or brush clearing | 5 | 14% |
| Recreational use (non-ORV) | 3 | 8% |
| Foot traffic/trampling | 3 | 8% |
| Improper burning regime | 3 | 8% |
| Non-native plant impacts | 3 | 8% |
| Grazing | 2 | 5% |
| Vandalism/dumping/litter | 2 | 5% |
| Other | 1 | 2% |
Notes
| Threatened by development. Possibly threatened by non-native plants. State-listed as Hemizonia minthornii; see this name in The Jepson Manual. See Manual of the Flowering Plants of California, p. 1092 (1925) by W.L. Jepson for original description, and Novon 9:462-471 (1999) for revised nomenclature. |
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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 2 November 2025].