Taxon Report
Clarkia biloba (Durand) Nels. & Macbr. ssp. australis Lewis & LewisMariposa clarkia |
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Taxon Summary
Clarkia biloba ssp. australis, commonly known as Mariposa clarkia, is a annual herb in the Onagraceae that is found only in California. It occurs within Chaparral, and Cismontane woodland, growing at elevations from 300 to 1460 meters. Clarkia biloba ssp. australis is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.Classification
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Scientific Name: |
Clarkia biloba (Durand) Nels. & Macbr. ssp. australis Lewis & Lewis |
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Common Name: |
Mariposa clarkia |
| Family: | Onagraceae |
| Element Code: | PDONA05051 |
| USDA Plants Symbol: | CLBIA |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Apr-Jul | Apr-Jul |
| Elevation: | 300-1460 (985-4790) |
| General Habitats: | Chaparral, Cismontane woodland |
| Microhabitat: | Serpentine |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G4G5T3 |
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State Rank: |
S3 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; SB_CalBG/RSABG; SB_SBBG; USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 119 |
| Element Occurrence Ranks: | |
| Excellent (A) | 9 |
| Good (B) | 24 |
| Fair (C) | 6 |
| Poor (D) | 1 |
| None (X) | 0 |
| Unknown (U) | 79 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Mariposa (MPA), Tuolumne (TUO) | |
| Quads: Name (Quad Code) | |
| Ascension Mtn. (3711978), Bear Valley (3712051), Cherry Lake South (3711988), Chinese Camp (3712074), Coulterville (3712062), Crandall Peak (3812022), Duckwall Mtn. (3712081)?, Feliciana Mtn. (3711958), Groveland (3712072), Hornitos (3712052), Hull Creek (3812011), Jawbone Ridge (3712071), Kinsley (3711968), Mariposa (3711948), Merced Falls (3712053), Penon Blanco Peak (3712063), Sonora (3712084), Tuolumne (3712082), Twain Harte (3812012) | |
Threat List Data from the CNDDB
| Threat List Total: | 15 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 82 | 69 % | |
| Non-native plant impacts | 43 | 36% |
| Road/trail construction/maint. | 31 | 26% |
| Erosion/runoff | 24 | 20% |
| Grazing | 19 | 15% |
| Altered flood/tidal/hydrologic regime | 18 | 15% |
| ORV activity | 8 | 6% |
| Recreational use (non-ORV) | 8 | 6% |
| Biocides | 7 | 5% |
| Other | 5 | 4% |
| Foot traffic/trampling | 4 | 3% |
| Mining | 4 | 3% |
| Improper burning regime | 2 | 1% |
| Disking | 1 | 0% |
| Vandalism/dumping/litter | 1 | 0% |
| Wood cutting or brush clearing | 1 | 0% |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 5 February 2025].