Taxon Report
Calochortus clavatus Wats. var. avius Jeps.Pleasant Valley mariposa-lily |
 © 2023 Sierra Pacific Industries |
Taxon Summary
Calochortus clavatus var. avius, commonly known as Pleasant Valley mariposa-lily, is a perennial bulbiferous herb in the Liliaceae that is found only in California. It occurs within Lower montane coniferous forest (Josephine silt loam, and volcanic), growing at elevations from 305 to 1800 meters. Calochortus clavatus var. avius is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.Classification
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Scientific Name: |
Calochortus clavatus Wats. var. avius Jeps. |
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Common Name: |
Pleasant Valley mariposa-lily |
| Family: | Liliaceae |
| Element Code: | PMLIL0D095 |
| USDA Plants Symbol: | CACLA |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial bulbiferous herb |
| Blooming Period: May-Jul | May-Jul |
| Elevation: | 305-1800 (1000-5905) |
| General Habitats: | Lower montane coniferous forest |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 1B.2 |
| Global Rank: | G4T2T3 |
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State Rank: |
S2S3 |
| State List: | None |
| Fed List: | None |
| Other Status: | BLM_S; SB_SBBG; USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 131 |
| Element Occurrence Ranks: | |
| Excellent (A) | 7 |
| Good (B) | 37 |
| Fair (C) | 19 |
| Poor (D) | 6 |
| None (X) | 1 |
| Unknown (U) | 61 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Amador (AMA), Calaveras (CAL), El Dorado (ELD), Mariposa (MPA)*, Placer (PLA) | |
| Quads: Name (Quad Code) | |
| Caldor (3812054), Camino (3812066), Devil Peak (3812085), Devils Nose (3812044), Dorrington (3812033), Garnet Hill (3812043), Illinois Hill (3712031)*, Kyburz (3812073), Omo Ranch (3812055), Peddler Hill (3812053), Pollock Pines (3812075), Riverton (3812074), Sly Park (3812065), Stump Spring, Calif. (3812064) | |
Threat List Data from the CNDDB
| Threat List Total: | 17 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 104 | 79 % | |
| Logging | 91 | 69% |
| Road/trail construction/maint. | 35 | 26% |
| Grazing | 30 | 22% |
| Erosion/runoff | 14 | 10% |
| ORV activity | 10 | 7% |
| Other | 10 | 7% |
| Biocides | 9 | 6% |
| Over-collecting/poaching | 6 | 4% |
| Wood cutting or brush clearing | 6 | 4% |
| Non-native plant impacts | 5 | 3% |
| Foot traffic/trampling | 5 | 3% |
| Improper burning regime | 5 | 3% |
| Development | 3 | 2% |
| Agriculture | 3 | 2% |
| Recreational use (non-ORV) | 2 | 1% |
| Mining | 2 | 1% |
| Vandalism/dumping/litter | 1 | 0% |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 25 October 2025].