Taxon Report
Clarkia gracilis (Piper) Nels. & Macbr. ssp. albicaulis (Jeps.) Lewis & Lewiswhite-stemmed clarkia |
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Taxon Summary
Clarkia gracilis ssp. albicaulis, commonly known as white-stemmed 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 245 to 1085 meters. Clarkia gracilis ssp. albicaulis 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 gracilis (Piper) Nels. & Macbr. ssp. albicaulis (Jeps.) Lewis & Lewis |
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Common Name: |
white-stemmed clarkia |
| Family: | Onagraceae |
| Element Code: | PDONA050J1 |
| USDA Plants Symbol: | CLGRA |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: (Apr)May-Jul | (Apr)May-Jul |
| Elevation: | 245-1085 (805-3560) |
| General Habitats: | Chaparral, Cismontane woodland |
| Microhabitat: | Serpentine (sometimes) |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G5T3 |
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State Rank: |
S3 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; SB_UCBG; USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 32 |
| Element Occurrence Ranks: | |
| Excellent (A) | 4 |
| Good (B) | 10 |
| Fair (C) | 2 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 16 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Butte (BUT), Tehama (TEH) | |
| Quads: Name (Quad Code) | |
| Acorn Hollow (4012118), Barkley Mtn. (4012126), Berry Creek (3912164), Cherokee (3912165), Cohasset (3912186), Devils Parade Ground (4012116), Forbestown (3912153), Paradise East (3912175), Paradise West (3912176), Pulga (3912174), Richardson Springs (3912177) | |
Threat List Data from the CNDDB
| Threat List Total: | 8 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 16 | 50 % | |
| Road/trail construction/maint. | 13 | 40% |
| Non-native plant impacts | 4 | 12% |
| Erosion/runoff | 2 | 6% |
| Logging | 1 | 3% |
| Mining | 1 | 3% |
| Recreational use (non-ORV) | 1 | 3% |
| Vandalism/dumping/litter | 1 | 3% |
| Biocides | 1 | 3% |
Selected References
| Clarkia gracilis ssp. albicaulis account for potential Species of Conservation Concern evaluation (2022) |
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 November 2025].