Taxon Report
Calochortus syntrophus CallahanCallahan's mariposa-lily |
 ©2018 Julie Kierstead Nelson |
Taxon Summary
Calochortus syntrophus, commonly known as Callahan's mariposa-lily, is a perennial bulbiferous herb in the Liliaceae that is found only in California. It occurs within Cismontane woodland, and Valley and foothill grassland (vernally mesic), growing at elevations from 525 to 1145 meters. Calochortus syntrophus is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Calochortus syntrophus Callahan |
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Common Name: |
Callahan's mariposa-lily |
| Family: | Liliaceae |
| Element Code: | PMLIL0D1S0 |
| USDA Plants Symbol: | CASY7 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial bulbiferous herb |
| Blooming Period: May-Jun | May-Jun |
| Elevation: | 525-1145 (1725-3755) |
| General Habitats: | Cismontane woodland, Valley and foothill grassland |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G2 |
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State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | SB_UCSC |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 14 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 6 |
| Fair (C) | 1 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 7 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Butte (BUT), Shasta (SHA), Tehama (TEH) | |
| Quads: Name (Quad Code) | |
| Barkley Mtn. (4012126), Cohasset (3912186), Devils Parade Ground (4012116), Dewitt Peak (4012128), Finley Butte (4012137), Lyonsville (4012136), Roaring Creek (4012188), Whitmore (4012168) | |
Threat List Data from the CNDDB
| Threat List Total: | 3 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 6 | 43 % | |
| Logging | 4 | 28% |
| Recreational use (non-ORV) | 1 | 7% |
| Road/trail construction/maint. | 1 | 7% |
Selected References
| Proposed List Change from 3.1 to 1B.1 |
| Herbertia 49:20 (1993) |
| Calochortus syntrophus profile for potential Species of Conservation Concern evaluation (2021) |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 October 2025].