Taxon Report
Pseudobahia peirsonii MunzSan Joaquin adobe sunburst |
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Taxon Summary
Pseudobahia peirsonii, commonly known as San Joaquin adobe sunburst, is a annual herb in the Asteraceae that is found only in California. It occurs within Cismontane woodland, and Valley and foothill grassland, growing at elevations from 90 to 800 meters. Pseudobahia peirsonii is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Pseudobahia peirsonii Munz |
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Common Name: |
San Joaquin adobe sunburst |
| Family: | Asteraceae |
| Element Code: | PDAST7P030 |
| USDA Plants Symbol: | PSPE |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Feb-Apr | Feb-Apr |
| Elevation: | 90-800 (295-2625) |
| General Habitats: | Cismontane woodland, Valley and foothill grassland |
| Microhabitat: | Adobe, Clay |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G1 |
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State Rank: |
S1 |
| State List: | CE |
| Fed List: | FT |
| Other Status: | SB_CalBG/RSABG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 51 |
| Element Occurrence Ranks: | |
| Excellent (A) | 1 |
| Good (B) | 11 |
| Fair (C) | 13 |
| Poor (D) | 9 |
| None (X) | 10 |
| Unknown (U) | 7 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Fresno (FRE), Kern (KRN), Tulare (TUL) | |
| Quads: Name (Quad Code) | |
| Chickencoop Canyon (3611838), Ducor (3511981)*, Fountain Springs (3511888), Frazier Valley (3611828), Lindsay (3611921)*, Oiler Peak (3511835), Orange Cove South (3611953), Pine Mountain (3511857), Porterville (3611911), Quincy School (3511878), Reedley (3611954)*, Richgrove (3511971), Rio Bravo Ranch (3511847), Rocky Hill (3611931)*, Round Mountain (3611975), Sand Canyon (3511868), Stokes Mtn. (3611952), Success Dam (3611818), Tejon Hills (3511817), Tejon Ranch (3511816), Tulare (3611923)*, Wahtoke (3611964), White River (3511877), Woodlake (3611941), Woody (3511867)* | |
Threat List Data from the CNDDB
| Threat List Total: | 16 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 48 | 94 % | |
| Grazing | 34 | 66% |
| Agriculture | 21 | 41% |
| Non-native plant impacts | 15 | 29% |
| Development | 14 | 27% |
| Road/trail construction/maint. | 13 | 25% |
| Foot traffic/trampling | 8 | 15% |
| Other | 7 | 13% |
| Disking | 7 | 13% |
| Erosion/runoff | 7 | 13% |
| Biocides | 5 | 9% |
| Mining | 4 | 7% |
| Dam/Inundation | 3 | 5% |
| Recreational use (non-ORV) | 3 | 5% |
| ORV activity | 1 | 1% |
| Surface water diversion | 1 | 1% |
| Altered flood/tidal/hydrologic regime | 1 | 1% |
Notes
| More than half of known occurrences are very small. Seriously threatened by agriculture, grazing, development, non-native plants, road construction and maintenance, and flood control activities. Possibly threatened by road maintenance. See Aliso 2:84 (1949) for original description. |
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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 30 November 2025].