Taxon Report
Camissoniopsis hardhamiae (P.H. Raven) W.L. Wagner & HochHardham's evening-primrose |
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Taxon Summary
Camissoniopsis hardhamiae, commonly known as Hardham's evening-primrose, is a annual herb in the Onagraceae that is found only in California. It occurs within Chaparral, and Cismontane woodland, growing at elevations from 140 to 945 meters. Camissoniopsis hardhamiae is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.Classification
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Scientific Name: |
Camissoniopsis hardhamiae (P.H. Raven) W.L. Wagner & Hoch |
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Common Name: |
Hardham's evening-primrose |
| Family: | Onagraceae |
| Element Code: | PDONA030N0 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Mar-May | Mar-May |
| Elevation: | 140-945 (460-3100) |
| General Habitats: | Chaparral, Cismontane woodland |
| Microhabitat: | Burned areas (sometimes), Carbonate, Disturbed areas (sometimes), Sandy |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G2 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 22 |
| Element Occurrence Ranks: | |
| Excellent (A) | 6 |
| Good (B) | 5 |
| Fair (C) | 0 |
| Poor (D) | 1 |
| None (X) | 0 |
| Unknown (U) | 10 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Monterey (MNT), San Luis Obispo (SLO) | |
| Quads: Name (Quad Code) | |
| Bear Canyon (3612113), Bradley (3512077), Camatta Ranch (3512043), Cosio Knob (3612112), Hames Valley (3512088), Morro Bay South (3512037), Pebblestone Shut-in (3512161), San Miguel (3512076), Santa Margarita (3512045), Santa Margarita Lake (3512034), Slack Canyon (3612016), Valleton (3512086), Wilson Corner (3512044) | |
Threat List Data from the CNDDB
| Threat List Total: | 12 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 11 | 50 % | |
| Other | 8 | 36% |
| Road/trail construction/maint. | 6 | 27% |
| Grazing | 4 | 18% |
| Foot traffic/trampling | 3 | 13% |
| Military operations | 3 | 13% |
| Feral pigs | 2 | 9% |
| Biocides | 1 | 4% |
| Erosion/runoff | 1 | 4% |
| Mining | 1 | 4% |
| Non-native plant impacts | 1 | 4% |
| ORV activity | 1 | 4% |
| Improper burning regime | 1 | 4% |
Notes
| Threatened by proposed road construction in SLO Co; also threatened by grazing, mining, military activities, non-native plants, road maintenance, and vehicles. See Contributions from the U.S. National Herbarium 37(5):301 (1969) for original description. |
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Threats: |
| Threatened by proposed road construction in SLO Co; also threatened by grazing, mining, military activities, non-native plants, road maintenance, and vehicles. |
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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 November 2025].