Taxon Report
Blepharizonia plumosa (Kell.) Greenebig tarplant |
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Species Description:
Blepharizonia plumosa, commonly known as big tarplant, is a annual herb in the Asteraceae that is found only in California. It occurs within Valley and foothill grassland, growing at elevations from 30 to 505 meters. Blepharizonia plumosa is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.
Classification
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Scientific Name: |
Blepharizonia plumosa (Kell.) Greene |
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Common Name: |
big tarplant |
| Family: | Asteraceae |
| Element Code: | PDAST1C011 |
| USDA Plants Symbol: | BLPL |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Jul-Oct | Jul-Oct |
| Elevation: | 30-505 (100-1655) |
| General Habitats: | Valley and foothill grassland |
| Microhabitat: | Clay (usually) |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G1G2 |
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State Rank: |
S1S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | SB_CalBG/RSABG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 53 |
| Element Occurrence Ranks: | |
| Excellent (A) | 6 |
| Good (B) | 24 |
| Fair (C) | 4 |
| Poor (D) | 1 |
| None (X) | 2 |
| Unknown (U) | 16 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Alameda (ALA), Contra Costa (CCA), San Joaquin (SJQ), Solano (SOL)*, Stanislaus (STA) | |
| Quads: Name (Quad Code) | |
| Altamont (3712166), Antioch North (3812117)(?), Antioch South (3712187), Benicia (3812212), Brentwood (3712186), Byron Hot Springs (3712176), Clayton (3712188), Copper Mtn. (3712143), Honker Bay (3812118)(?), Midway (3712165), Patterson (3712142), Stockton West (3712183), Tracy (3712164), Union Island (3712174), Walnut Creek (3712281)(?), Westley (3712152)* | |
Threat List Data from the CNDDB
| Threat List Total: | 9 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 25 | 47 % | |
| Grazing | 13 | 24% |
| Development | 11 | 20% |
| Non-native plant impacts | 9 | 16% |
| Road/trail construction/maint. | 5 | 9% |
| Disking | 4 | 7% |
| Erosion/runoff | 3 | 5% |
| ORV activity | 2 | 3% |
| Other | 2 | 3% |
| Improper burning regime | 1 | 1% |
Notes
| Historical occurrences probably extirpated by agriculture and non-native plants. Seriously threatened by urbanization; also threatened by disking, residential development, and non-native plants. See B. plumosa ssp. plumosa in TJM (1993). See Proceedings of the California Academy of Sciences I 5:49 (1873) for original description, Systematic Botany 26(1):184-194 (2001) for elevation to specific rank, and Madroño 48(4):272-285 (2001) for demography and population 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 19 January 2025].