Taxon Report
Centromadia parryi (Greene) Greene ssp. australis (Keck) B.G. Baldwinsouthern tarplant |
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Taxon Summary
Centromadia parryi ssp. australis, commonly known as southern tarplant, is a annual herb in the Asteraceae that is found in California and elsewhere. It occurs within Marshes and swamps (margins), Valley and foothill grassland (vernally mesic), and Vernal pools, growing at elevations from 0 to 480 meters. Centromadia parryi ssp. australis is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Centromadia parryi (Greene) Greene ssp. australis (Keck) B.G. Baldwin |
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Common Name: |
southern tarplant |
| Family: | Asteraceae |
| Element Code: | PDAST4R0P4 |
| USDA Plants Symbol: | CEPAA |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: May-Nov | May-Nov |
| Elevation: | 0-480 (0-1575) |
| General Habitats: | Marshes and swamps, Valley and foothill grassland, Vernal pools |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G3T2 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | SB_CalBG/RSABG; SB_CRES; SB_SBBG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 94 |
| Element Occurrence Ranks: | |
| Excellent (A) | 3 |
| Good (B) | 17 |
| Fair (C) | 11 |
| Poor (D) | 4 |
| None (X) | 10 |
| Unknown (U) | 49 |
| California Endemic: False | |
| California Counties and Islands: Name (Code) | |
| Los Angeles (LAX), Orange (ORA), San Diego (SDG), Santa Barbara (SBA), Ventura (VEN) | |
| Quads: Name (Quad Code) | |
| Anaheim (3311778), Baldwin Park (3411718), Beverly Hills (3411814)*, Canada Gobernadora (3311755), Del Mar (3211782), Dos Pueblos Canyon (3411948), El Monte (3411811), Escondido (3311711), Goleta (3411947), Hollywood (3411813)*, Inglewood (3311883)*, Laguna Beach (3311757), Long Beach (3311872)*, Los Alamitos (3311871), Morro Hill (3311733), Mt. Wilson (3411821), Newbury Park (3411828), Newport Beach (3311768), Orange (3311777), Pasadena (3411822)*, Pitas Point (3411934)(?), San Marcos (3311722), San Pasqual (3311618), Santa Catalina East (3311833)?, Seal Beach (3311861), South Gate (3311882)*, Sunland (3411833), Torrance (3311873), Tustin (3311767), Valley Center (3311721), Venice (3311884)* | |
Threat List Data from the CNDDB
| Threat List Total: | 16 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 43 | 46 % | |
| Development | 20 | 21% |
| Other | 14 | 14% |
| Foot traffic/trampling | 11 | 11% |
| Road/trail construction/maint. | 10 | 10% |
| Non-native plant impacts | 7 | 7% |
| ORV activity | 6 | 6% |
| Disking | 6 | 6% |
| Recreational use (non-ORV) | 5 | 5% |
| Vandalism/dumping/litter | 4 | 4% |
| Agriculture | 3 | 3% |
| Grazing | 3 | 3% |
| Waterway bank protection/maintenance | 2 | 2% |
| Wood cutting or brush clearing | 1 | 1% |
| Hybridization | 1 | 1% |
| Military operations | 1 | 1% |
| Mining | 1 | 1% |
Notes
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Need confirmation of SCT Isl. occurrences. Many ORA Co. occurrences recently extirpated. Many historical occurrences also extirpated; need information. Population fragmentation a serious problem, and plant continues to be threatened by urbanization, vehicles, development, foot traffic, grazing, habitat disturbance, and competition from non-native plants. A synonym of Hemizonia parryi |
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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 29 October 2025].