Taxon Report
Calochortus plummerae GreenePlummer's mariposa-lily |
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Species Description:
Calochortus plummerae, commonly known as Plummer's mariposa-lily, is a perennial bulbiferous herb in the Liliaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, Coastal scrub, Lower montane coniferous forest, and Valley and foothill grassland, growing at elevations from 100 to 1700 meters. Calochortus plummerae is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.
Classification
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Scientific Name: |
Calochortus plummerae Greene |
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Common Name: |
Plummer's mariposa-lily |
| Family: | Liliaceae |
| Element Code: | PMLIL0D150 |
| USDA Plants Symbol: | CAPL2 |
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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: | 100-1700 (330-5580) |
| General Habitats: | Chaparral, Cismontane woodland, Coastal scrub, Lower montane coniferous forest, Valley and foothill grassland |
| Microhabitat: | Granitic, Rocky |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 4.2 |
| Global Rank: | G4 |
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State Rank: |
S4 |
| State List: | None |
| Fed List: | None |
| Other Status: | SB_CalBG/RSABG |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 230 |
| Element Occurrence Ranks: | |
| Excellent (A) | 4 |
| Good (B) | 37 |
| Fair (C) | 25 |
| Poor (D) | 12 |
| None (X) | 8 |
| Unknown (U) | 144 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Los Angeles (LAX), Orange (ORA), Riverside (RIV), San Bernardino (SBD), San Diego (SDG), Ventura (VEN) | |
| Quads: Name (Quad Code) | |
| Acton (3411842), Agua Dulce (3411843), Azusa (3411728), Bachelor Mtn. (3311751), Baldwin Park (3411718), Beaumont (3311688), Beverly Hills (3411814), Big Bear Lake (3411628), Black Star Canyon (3311776), Blackburn Canyon (3311667), Burbank (3411823), Cabazon (3311687)*, Cahuilla Mtn. (3311657), Cajon (3411734), Calabasas (3411826), Camarillo (3411921), Canoga Park (3411825), Chilao Flat (3411831), Condor Peak (3411832)*, Corona South (3311775), Crystal Lake (3411737), Cucamonga Peak (3411725), Devore (3411724), El Casco (3311781), El Monte (3411811), El Toro (3311766), Fontana (3411714), Forest Falls (3411618), Glendora (3411727), Guasti (3411715), Harrison Mtn. (3411722), Hollywood (3411813)*, Idyllwild (3311666), Keller Peak (3411721), La Habra (3311788), Lake Fulmor (3311677), Lakeview (3311771), Lebec (3411877), Los Angeles (3411812)*, Malibu Beach (3411816), Mint Canyon (3411844), Moonridge (3411627), Mount San Antonio (3411736), Mt. Baldy (3411726), Mt. Wilson (3411821), Newbury Park (3411828), Newhall (3411845), Oat Mountain (3411835), Ojai (3411942), Ontario (3411716)*, Pasadena (3411822)*, Point Dume (3411817), Rancho Santa Fe (3311712), Redlands (3411712), Riverside East (3311783), San Bernardino North (3411723), San Dimas (3411717), San Fernando (3411834), San Gorgonio Mtn. (3411617), San Jacinto (3311678), Santa Susana (3411836), Silverwood Lake (3411733), Simi (3411837), Sunland (3411833), Sunnymead (3311782), Telegraph Peak (3411735)*, Thousand Oaks (3411827), Topanga (3411815)*, Triunfo Pass (3411818), Van Nuys (3411824), Whittier (3311881), Winchester (3311761), Yucaipa (3411711) | |
Threat List Data from the CNDDB
| Threat List Total: | 14 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 122 | 53 % | |
| Development | 58 | 25% |
| Road/trail construction/maint. | 36 | 15% |
| Non-native plant impacts | 18 | 7% |
| Recreational use (non-ORV) | 13 | 5% |
| ORV activity | 10 | 4% |
| Foot traffic/trampling | 9 | 3% |
| Erosion/runoff | 8 | 3% |
| Other | 6 | 2% |
| Wood cutting or brush clearing | 6 | 2% |
| Mining | 5 | 2% |
| Improper burning regime | 4 | 1% |
| Over-collecting/poaching | 3 | 1% |
| Grazing | 1 | 0% |
| Landfill | 1 | 0% |
Notes
| Previously on List 1B.2; more common than originally known. Threatened by development, fire suppression, foot traffic, mining, powerline construction, and recreational activities. Possibly threatened by vegetation clearing, collecting, road maintenance, and non-native plants. Less common at higher elevations. Hybridizes with C. weedii var. intermedius. See Pittonia 2:70 (1890) for original description, and Annals of the Missouri Botanical Garden 27:515 (1940) for taxonomic treatment. |
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Threats: |
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Taxonomy: |
Selected References
| Proposed Rank Change from 1B.2, G3 / S3 to 4.2, G4 / S4 (2012) |
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 January 2025].