Taxon Report
Calochortus clavatus Wats. var. gracilis Ownbeyslender mariposa-lily |
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Species Description:
Calochortus clavatus var. gracilis, commonly known as slender mariposa-lily, is a perennial bulbiferous herb in the Liliaceae that is found only in California. It occurs within Chaparral, Coastal scrub, and Valley and foothill grassland, growing at elevations from 320 to 1000 meters. Calochortus clavatus var. gracilis 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. gracilis Ownbey |
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Common Name: |
slender mariposa-lily |
| Family: | Liliaceae |
| Element Code: | PMLIL0D096 |
| USDA Plants Symbol: | CACLG |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | perennial bulbiferous herb |
| Blooming Period: Mar-Jun(Nov) | Mar-Jun(Nov) |
| Elevation: | 320-1000 (1050-3280) |
| General Habitats: | Chaparral, Coastal scrub, Valley and foothill grassland |
| 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_CalBG/RSABG; USFS_S |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 143 |
| Element Occurrence Ranks: | |
| Excellent (A) | 7 |
| Good (B) | 33 |
| Fair (C) | 28 |
| Poor (D) | 9 |
| None (X) | 3 |
| Unknown (U) | 63 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Los Angeles (LAX), Ventura (VEN) | |
| Quads: Name (Quad Code) | |
| Agua Dulce (3411843), Azusa (3411728), Black Mtn. (3411867), Burbank (3411823), Calabasas (3411826), Camarillo (3411921), Crystal Lake (3411737), Green Valley (3411854), Lake Hughes (3411864), Liebre Mtn. (3411866), Malibu Beach (3411816), Mint Canyon (3411844), Mount San Antonio (3411736), Mt. Baldy (3411726), Newhall (3411845), Oat Mountain (3411835), Piru (3411847), Point Dume (3411817), San Fernando (3411834), Santa Susana (3411836), Sleepy Valley (3411853), Thousand Oaks (3411827), Topanga (3411815), Val Verde (3411846), Warm Springs Mountain (3411855), Whitaker Peak (3411856) | |
Threat List Data from the CNDDB
| Threat List Total: | 14 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 73 | 51 % | |
| Development | 40 | 27% |
| Other | 16 | 11% |
| Recreational use (non-ORV) | 8 | 5% |
| Road/trail construction/maint. | 8 | 5% |
| ORV activity | 4 | 2% |
| Non-native plant impacts | 3 | 2% |
| Foot traffic/trampling | 2 | 1% |
| Grazing | 2 | 1% |
| Improper burning regime | 1 | 0% |
| Landfill | 1 | 0% |
| Mining | 1 | 0% |
| Altered flood/tidal/hydrologic regime | 1 | 0% |
| Over-collecting/poaching | 1 | 0% |
| Wood cutting or brush clearing | 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 15 January 2025].