Taxon Report
Acanthomintha duttonii (Abrams) JokerstSan Mateo thorn-mint |
 © 2011 Aaron Schusteff |
Taxon Summary
Acanthomintha duttonii, commonly known as San Mateo thorn-mint, is a annual herb in the Lamiaceae that is found only in California. It occurs within Chaparral, and Valley and foothill grassland, growing at elevations from 50 to 300 meters. Acanthomintha duttonii is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Acanthomintha duttonii (Abrams) Jokerst |
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Common Name: |
San Mateo thorn-mint |
| Family: | Lamiaceae |
| Element Code: | PDLAM01040 |
| USDA Plants Symbol: | ACDU2 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Apr-Jun | Apr-Jun |
| Elevation: | 50-300 (165-985) |
| General Habitats: | Chaparral, Valley and foothill grassland |
| Microhabitat: | Serpentine |
| 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: | FE |
| Other Status: | SB_UCBG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 5 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 1 |
| Fair (C) | 0 |
| Poor (D) | 1 |
| None (X) | 2 |
| Unknown (U) | 1 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| San Mateo (SMT) | |
| Quads: Name (Quad Code) | |
| Palo Alto (3712242)*, San Mateo (3712253)*, Woodside (3712243) | |
Threat List Data from the CNDDB
| Threat List Total: | 8 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 5 | 100 % | |
| Development | 3 | 60% |
| Non-native plant impacts | 3 | 60% |
| Altered flood/tidal/hydrologic regime | 2 | 40% |
| ORV activity | 1 | 20% |
| Other | 1 | 20% |
| Recreational use (non-ORV) | 1 | 20% |
| Road/trail construction/maint. | 1 | 20% |
| Vandalism/dumping/litter | 1 | 20% |
Notes
| One historical occurrence has been extirpated. Seriously threatened by development, non-native plants, vehicles, and vandalism. USFWS uses the name Acanthomintha obovata ssp. duttonii. See Illustrated Flora of the Pacific States 3:635 (1951) by L. Abrams for original description, and Madroño 38(4):278-286 (1991) for revised nomenclature. |
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Threats: |
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Taxonomy: |
Selected References
| Recovery Plan for Acanthomintha duttonii (San Mateo thorn-mint) (USFWS 1998) |
| Recovery Plan Amendment for Acanthomintha duttonii (San Mateo thorn-mint) (USFWS 2019) |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 20 November 2025].