Taxon Report
Trifolium trichocalyx HellerMonterey clover |
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Taxon Summary
Trifolium trichocalyx, commonly known as Monterey clover, is a annual herb in the Fabaceae that is found only in California. It occurs within Closed-cone coniferous forest (burned areas, openings, and sandy), growing at elevations from 30 to 305 meters. Trifolium trichocalyx is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Trifolium trichocalyx Heller |
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Common Name: |
Monterey clover |
| Family: | Fabaceae |
| Element Code: | PDFAB402J0 |
| USDA Plants Symbol: | TRTR |
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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: | 30-305 (100-1000) |
| General Habitats: | Closed-cone coniferous forest |
| Microhabitat: | |
| 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; SB_USDA |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 6 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 3 |
| Fair (C) | 1 |
| Poor (D) | 2 |
| None (X) | 0 |
| Unknown (U) | 0 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Mendocino (MEN), Monterey (MNT) | |
| Quads: Name (Quad Code) | |
| Eureka Hill (3812385), Mathison Peak (3912336), Monterey (3612158), Point Arena (3812386) | |
Threat List Data from the CNDDB
| Threat List Total: | 9 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 5 | 83 % | |
| Non-native plant impacts | 4 | 66% |
| Other | 4 | 66% |
| Road/trail construction/maint. | 3 | 50% |
| Recreational use (non-ORV) | 2 | 33% |
| Logging | 2 | 33% |
| Mining | 1 | 16% |
| Development | 1 | 16% |
| Improper burning regime | 1 | 16% |
| Wood cutting or brush clearing | 1 | 16% |
Notes
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Discovered in Big River Forest (TCF), MEN Co. by K. Heise and G. Hulse-Stephens in 2011. Previously known from only two occurrences from the central portion of the Monterey Peninsula; where fewer than 1000 plants seen in 1987, none in 1992, and only 22 in 1995. Seriously threatened by urbanization and altered fire regimes. Appears to be a fire follower. Possibly of hybrid origin. See Muhlenbergia |
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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 4 November 2025].