Taxon Report
Extriplex joaquinana (A. Nelson) E.H. ZachariasSan Joaquin spearscale |
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Taxon Summary
Extriplex joaquinana, commonly known as San Joaquin spearscale, is a annual herb in the Chenopodiaceae that is found only in California. It occurs within Chenopod scrub, Meadows and seeps, Playas, and Valley and foothill grassland, growing at elevations from 1 to 835 meters. Extriplex joaquinana is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.Classification
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Scientific Name: |
Extriplex joaquinana (A. Nelson) E.H. Zacharias |
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Common Name: |
San Joaquin spearscale |
| Family: | Chenopodiaceae |
| Element Code: | PDCHE041F3 |
| USDA Plants Symbol: | |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Apr-Oct | Apr-Oct |
| Elevation: | 1-835 (5-2740) |
| General Habitats: | Chenopod scrub, Meadows and seeps, Playas, Valley and foothill grassland |
| Microhabitat: | Alkaline |
| 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; SB_CalBG/RSABG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 127 |
| Element Occurrence Ranks: | |
| Excellent (A) | 5 |
| Good (B) | 28 |
| Fair (C) | 25 |
| Poor (D) | 8 |
| None (X) | 13 |
| Unknown (U) | 48 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Alameda (ALA), Colusa (COL), Contra Costa (CCA), Fresno (FRE), Glenn (GLE), Merced (MER), Napa (NAP), Sacramento (SAC), San Benito (SBT), San Joaquin (SJQ)*, San Luis Obispo (SLO)?, Solano (SOL), Yolo (YOL) | |
| Quads: Name (Quad Code) | |
| Altamont (3712166), Antioch North (3812117), Antioch South (3712187), Arena (3712036), Brentwood (3712186), Byron Hot Springs (3712176), Ciervo Mtn. (3612045), Clifton Court Forebay (3712175), Colusa (3912221), Cuttings Wharf (3812223), Davis (3812156), Denverton (3812128), Diablo (3712178)*, Dozier (3812137), Dunnigan (3812188)*, Elmira (3812138)*, Fairfield North (3812231), Fairfield South (3812221), Glascock Mtn. (3812283), Grays Bend (3812166), Gustine (3712038), Hepsedam Peak (3612037), Hollister (3612174), Las Trampas Ridge (3712271), Liberty Island (3812136), Livermore (3712167), Logandale (3912242), Manor Slough (3912223), Maxwell (3912232), Milpitas (3712148), Morro Bay North (3512047), Morro Bay South (3512037)?, Napa (3812233), Newark (3712251), Niles (3712158), Oakland West (3712273)*, Rio Vista (3812126)*, Rock Spring Peak (3612048), Salt Canyon (3912213), San Felipe (3612184)*, Saxon (3812146), Sites (3912233), Stockton West (3712183)*, Stonyford (3912245), Tassajara (3712177), Tres Pinos (3612173), Vine Hill (3812211), Walnut Creek (3712281), Wilbur Springs (3912214), Wildwood School (3812281), Williams (3912222), Willows (3912252)*, Woodward Island (3712185) | |
Threat List Data from the CNDDB
| Threat List Total: | 15 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 82 | 65 % | |
| Development | 36 | 28% |
| Grazing | 35 | 27% |
| Agriculture | 18 | 14% |
| Non-native plant impacts | 8 | 6% |
| Other | 6 | 4% |
| Road/trail construction/maint. | 6 | 4% |
| Foot traffic/trampling | 6 | 4% |
| Disking | 5 | 3% |
| Erosion/runoff | 2 | 1% |
| ORV activity | 2 | 1% |
| Landfill | 1 | 0% |
| Biocides | 1 | 0% |
| Surface water diversion | 1 | 0% |
| Waterway bank protection/maintenance | 1 | 0% |
| Recreational use (non-ORV) | 1 | 0% |
Notes
| Many occurrences extirpated. Need historical quads for TUL Co. Need quads for MNT Co. Report from SLO Co. (247D) needs verification. Threatened by grazing, agriculture, development, and non-native plants. See Proceedings of the American Academy of Arts and Sciences 9:108 (1874) for original description, Proceedings of the Biological Society of Washington 17:99 (1904) for alternative nomenclature, and Systematic Botany 35(4):839-857 (2010) for revised nomenclature. |
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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 January 2025].