Horkelia tenuiloba
Common Name: thin-lobed horkelia
Family: Rosaceae
Element Code: PDROS0W0E0
Full Name: Horkelia tenuiloba (Torr.) Gray

2012 Aaron Arthur
Biology Glossary
Rarity Status Glossary
Occurrence Data from DFG
California Natural Diversity Database Glossary
  • Total # of Known Element Occurrences: 27
  • Element Occurrence Ranks:
    A B C D X U
    3 4 6 0 0 14
  • Population Status:
    >20 yrs
    <=20 yrs
    14 13
  • Presence:
    Present Extant Possibly Extirpated Extirpated
    27 0 0
Notes Glossary
  • Historical occurrences need field surveys. Threatened by development. Possibly threatened by foot traffic, trail maintenance, logging, and non-native plants. See Report of the Pacific Railroad Expedition 4(5):84 (1857) for original description, and Systematic Botany 18(1):137-144 (1993) for taxonomic treatment.
  • To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page.
  • Date Added: 1988-01-01
  • Last Update: 2013-01-18
Location Glossary
  • Elevation: 50 - 500 meters
  • California Endemic: yes
  • States: California
  • California Counties and Islands:   name (code)
    Mendocino (MEN),  Marin (MRN),  Sonoma (SON)
  • Quads:   name (DWR code) USGS code
    San Rafael (467A) 37122H5,  Bolinas (467B) 37122H6,  Sonoma (500C) 38122C4,  Sebastopol (502A) 38122D7,  Camp Meeker (502B) 38122D8,  Duncans Mills (503A) 38123D1,  Geyserville (518B) 38122F8,  Guerneville (518C) 38122E8,  Annapolis (520A) 38123F3,  Plantation (520D) 38123E3,  McGuire Ridge (536C) 38123G4,  Point Arena (537B) 38123H6,  Saunders Reef (537C) 38123G6,  Gualala (537D) 38123G5,  Willis Ridge (583D) 39123E3
  • Notes:
      Definitions of codes preceding a county and/or quad:
      * Presumed extirpated
      ? Uncertain about distribution or identity
      ?* Uncertain about distribution, but presumed extirpated if once present
      (?) Occurrence confirmed, but possibly extirpated
      Species may be present in other areas where conditions are favorable.
Presumed Extant Presumed Extirpated or Unknown 916
Links to Leading Resources of Taxon Information
Suggested Citation
CNPS, Rare Plant Program. . Inventory of Rare and Endangered Plants (online edition, v8-02). California Native Plant Society, Sacramento, CA. Website http://www.rareplants.cnps.org [accessed ].

37122H5=San Rafael (467A) 37122H5;37122H6=Bolinas (467B) 37122H6;38122C4=Sonoma (500C) 38122C4;38122D7=Sebastopol (502A) 38122D7;38122D8=Camp Meeker (502B) 38122D8;38123D1=Duncans Mills (503A) 38123D1;38122F8=Geyserville (518B) 38122F8;38122E8=Guerneville (518C) 38122E8;38123F3=Annapolis (520A) 38123F3;38123E3=Plantation (520D) 38123E3;38123G4=McGuire Ridge (536C) 38123G4;38123H6=Point Arena (537B) 38123H6;38123G6=Saunders Reef (537C) 38123G6;38123G5=Gualala (537D) 38123G5;39123E3=Willis Ridge (583D) 39123E3