Taxon Report
Calochortus tiburonensis HillTiburon mariposa-lily |
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Taxon Summary
Calochortus tiburonensis, commonly known as Tiburon mariposa-lily, is a perennial bulbiferous herb in the Liliaceae that is found only in California. It occurs within Valley and foothill grassland, growing at elevations from 50 to 150 meters. Calochortus tiburonensis 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 tiburonensis Hill |
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Common Name: |
Tiburon mariposa-lily |
| Family: | Liliaceae |
| Element Code: | PMLIL0D1C0 |
| USDA Plants Symbol: | CATI3 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial bulbiferous herb |
| Blooming Period: Mar-Jun | Mar-Jun |
| Elevation: | 50-150 (165-490) |
| General Habitats: | 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: | CT |
| Fed List: | FT |
| Other Status: | SB_UCBG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 1 |
| Element Occurrence Ranks: | |
| Excellent (A) | 1 |
| Good (B) | 0 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 0 |
| Unknown (U) | 0 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Marin (MRN) | |
| Quads: Name (Quad Code) | |
| San Quentin (3712284) | |
Threat List Data from the CNDDB
| Threat List Total: | 2 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 1 | 100 % | |
| Foot traffic/trampling | 1 | 100% |
| Non-native plant impacts | 1 | 100% |
Notes
| Known from only one occurrence at Ring Mtn. Preserve on the Tiburon Peninsula. Threatened by recreational activities and non-native plants. Potentially threatened by deer browsing. See Madroño 22(2):100-104 (1973) for original description, and Journal of Ecology 75:977-995 (1987) for population biology. |
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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 10 February 2025].