Taxon Report
Myosurus minimus L. ssp. apus (Greene) G.R. Campbelllittle mousetail |
|
Species Description:
Myosurus minimus ssp. apus, commonly known as little mousetail, is a annual herb in the Ranunculaceae that is found in California and elsewhere. It occurs within Valley and foothill grassland, and Vernal pools (alkaline), growing at elevations from 20 to 640 meters. Myosurus minimus ssp. apus is ranked 3.1, Plants About Which We Need More Information, A Review List; Seriously threatened in California.
Classification
|
Scientific Name: |
Myosurus minimus L. ssp. apus (Greene) G.R. Campbell |
|
Common Name: |
little mousetail |
| Family: | Ranunculaceae |
| Element Code: | PDRAN0H031 |
| USDA Plants Symbol: | |
|
Synonyms/Other Names: |
|
Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Mar-Jun | Mar-Jun |
| Elevation: | 20-640 (65-2100) |
| General Habitats: | Valley and foothill grassland, Vernal pools |
| Microhabitat: | |
| Microhabitat Details: |
Conservation Status
| CA Rare Plant Rank: | 3.1 |
| Global Rank: | G5T2Q |
|
State Rank: |
S2 |
| State List: | None |
| Fed List: | None |
| Other Status: | SB_CRES |
|
CRPR Changes: |
|
Occurrence Data from the CNDDB
| Total Occurrences: | 24 |
| Element Occurrence Ranks: | |
| Excellent (A) | 1 |
| Good (B) | 7 |
| Fair (C) | 1 |
| Poor (D) | 1 |
| None (X) | 0 |
| Unknown (U) | 14 |
| California Endemic: False | |
| California Counties and Islands: Name (Code) | |
| Colusa (COL), Contra Costa (CCA), Lake (LAK), Merced (MER), Riverside (RIV), San Bernardino (SBD), San Diego (SDG), Solano (SOL), Tulare (TUL), Yolo (YOL) | |
| Quads: Name (Quad Code) | |
| Arena (3712036), Birds Landing (3812127), Clearlake Highlands (3812286), Clifton Court Forebay (3712175), Del Mar (3211782), Denverton (3812128), Dozier (3812137), Dulzura (3211667), Elmira (3812138), Encinitas (3311713), Gustine (3712038), Imperial Beach (3211751), Jamul Mountains (3211668), La Jolla (3211772), La Mesa (3211771), Lake Elsinore (3311763), Lakeview (3311771), Las Pulgas Canyon (3311734), Lucerne Valley (3411648), Maxwell (3912232), Murrieta (3311752), Oceanside (3311724), Otay Mesa (3211658), Otay Mountain (3211657), Perris (3311772), Pixley (3511983), Poway (3211781), Romoland (3311762), San Clemente (3311745), San Luis Ranch (3712027), San Luis Rey (3311723), San Onofre Bluff (3311735), San Pasqual (3311618), Saxon (3812146), Steele Peak (3311773), Stevinson (3712037), Wildomar (3311753), Winchester (3311761) | |
Threat List Data from the CNDDB
| Threat List Total: | 9 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 9 | 38 % | |
| Agriculture | 3 | 12% |
| ORV activity | 3 | 12% |
| Development | 2 | 8% |
| Grazing | 2 | 8% |
| Non-native plant impacts | 1 | 4% |
| Disking | 1 | 4% |
| Other | 1 | 4% |
| Road/trail construction/maint. | 1 | 4% |
| Vandalism/dumping/litter | 1 | 4% |
Notes
| Move to List 1B? Reduced by vernal pool habitat loss; threatened by vehicles, grazing, development, and agriculture. Taxonomic problems; distinguishing between this taxon and M. sessilis (= M. minimus ssp. apus var. sessiliflorus in A California Flora (1959) by P. Munz) is difficult; are both rare? Plants in the Central Valley that resemble this taxon may be hybrids between M. minimus and M. sessilis; see Flora of North America 3:136 and Evolution 13:151-174 (1959) for details. See M. minimus in TJM (1993); not in TJM 2. See Bulletin of the California Academy of Sciences 1:277 (1885) for original description, and Aliso 2(4):396 (1952) for revised nomenclature. |
|
Threats: |
|
Taxonomy: |
Selected References
| CRPR List Deletion on 2013-02-01 |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 22 January 2025].