Species Details

Myosurus minimus ssp. apus

little mousetail

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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:
CA Rare Plant Rank: 3.1
Fed List: None
State List: None
Global Rank: G5T2Q
State Rank:
Other Status: SB_CRES
CRPR Changes:
removed from 3.1 on 2013-02-01
Add Date: 1980-01-01
Date Edited: 2021-05-26
Lifeform: annual herb
Blooming Period: Mar-Jun
20 - 640 meters
65 - 2100 feet
General Habitat:
  • Valley and foothill grassland
  • Vernal pools (alkaline)
General Micro Habitat:
Micro Habitat:
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.
Total Occurrences: 24
Element Occurrence Ranks:
1 7 1 1 0 14
Occurrence Status:
Historical >20 Years 24
Recent <=20 Years 0
Presumed Extant 24
Possibly Extirpated 0
Presumed Extirpated 0
California Endemic:
California Island:
States: Name (Code)
Baja California (BA), California (CA), Oregon (OR)
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)
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.


Presumed Extant
Counties   Quads