Taxon Report
Trifolium amoenum Greenetwo-fork clover |
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Taxon Summary
Trifolium amoenum, commonly known as two-fork clover, is a annual herb in the Fabaceae that is found only in California. It occurs within Coastal bluff scrub, and Valley and foothill grassland (sometimes serpentinite), growing at elevations from 5 to 415 meters. Trifolium amoenum 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 amoenum Greene |
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Common Name: |
two-fork clover |
| Family: | Fabaceae |
| Element Code: | PDFAB40040 |
| USDA Plants Symbol: | TRAM3 |
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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: | 5-415 (15-1360) |
| General Habitats: | Coastal bluff scrub, Valley and foothill grassland |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G1 |
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State Rank: |
S1 |
| State List: | None |
| Fed List: | FE |
| Other Status: | SB_CalBG/RSABG; SB_UCBG; SB_USDA |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 26 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 2 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 5 |
| Unknown (U) | 19 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Marin (MRN), Napa (NAP)*, San Mateo (SMT), Solano (SOL)*, Sonoma (SON)(?) | |
| Quads: Name (Quad Code) | |
| Bolinas (3712286)*, Camp Meeker (3812248)*, Cordelia (3812222), Cotati (3812236)*, Cuttings Wharf (3812223)*, Drakes Bay (3812218)*, Duncans Mills (3812341)(?), Elmira (3812138)*, Fairfield North (3812231), Inverness (3812217)*, Kenwood (3812245)*, Napa (3812233)*, Palo Alto (3712242), Petaluma (3812226)*, San Francisco South (3712264), San Quentin (3712284)*, San Rafael (3712285), Santa Rosa (3812246)*, Sebastopol (3812247)*, Two Rock (3812237), Valley Ford (3812238) | |
Threat List Data from the CNDDB
| Threat List Total: | 2 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 2 | 8 % | |
| Development | 2 | 7% |
| Erosion/runoff | 1 | 3% |
Notes
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Rediscovered in 1993 by P. Conners near Occidental; only one plant found, and subsequent surveys in 1994-1995 unsuccessful. Another occurrence (502C) discovered in 1996. Historical habitat lost to urbanization and agriculture. See Flora Franciscana |
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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 12 November 2025].