Hemizonia congesta ssp. congesta
Common Name: white seaside tarplant
Family: Asteraceae
Synonyms: Hemizonia congesta, Hemizonia congesta ssp. leucocephala
Element Code: PDAST4R065
Full Name: Hemizonia congesta DC. ssp. congesta
USDA PLANTS Symbol: HECOC2

Biology Glossary
Rarity Status Glossary
Occurrence Data from DFG
California Natural Diversity Database Glossary
  • Total # of Known Element Occurrences: 33
  • Element Occurrence Ranks:
    A B C D X U
    0 3 2 1 4 23
  • Population Status:
    Historic
    >20 yrs
    Recent
    <=20 yrs
    27 6
  • Presence:
    Present Extant Possibly Extirpated Extirpated
    29 3 1
Notes Glossary
  • Threatened by agriculture, development, and road construction. Possibly threatened by grazing. Hybridizes with H. congesta ssp. lutescens. See H. congesta ssp. leucocephala in The Jepson Manual (1993). What was once considered H. congesta ssp. congesta in The Jepson Manual (1993) is now considered H. congesta ssp. lutescens; a common taxon.
  • 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: 2011-10-31
Location Glossary
  • Elevation: 20 - 560 meters
  • California Endemic: yes
  • States: California
  • California Counties and Islands:   name (code)
    Mendocino (MEN),  Marin (MRN),  San Francisco (SFO),  San Mateo (SMT),  Sonoma (SON)
  • Quads:   name (DWR code) USGS code
    San Francisco South (448B) 37122F4,  San Francisco North (466C) 37122G4,  San Rafael (467A) 37122H5,  Bolinas (467B) 37122H6,  Sears Point (483B) 38122B4,  Petaluma (484B) 38122B6,  San Geronimo (484C) 38122A6,  Novato (484D) 38122A5,  Point Reyes NE (485A) 38122B7,  Tomales (485B) 38122B8,  Inverness (485D) 38122A7,  Sonoma (500C) 38122C4,  Santa Rosa (501B) 38122D6,  Cotati (501C) 38122C6,  Sebastopol (502A) 38122D7,  Valley Ford (502C) 38122C8,  Two Rock (502D) 38122C7,  Duncans Mills (503A) 38123D1,  Arched Rock (503B) 38123D2,  Jimtown (518A) 38122F7,  Healdsburg (518D) 38122E7,  Warm Springs Dam (519A) 38123F1,  Willits (567A) 39123D3,  Laughlin Range (567D) 39123C3,  Noyo Hill (568B) 39123D6
  • 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 147
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 ].
-122.375,38.25

CA
37122F4=San Francisco South (448B) 37122F4;37122G4=San Francisco North (466C) 37122G4;37122H5=San Rafael (467A) 37122H5;37122H6=Bolinas (467B) 37122H6;38122B4=Sears Point (483B) 38122B4;38122B6=Petaluma (484B) 38122B6;38122A6=San Geronimo (484C) 38122A6;38122A5=Novato (484D) 38122A5;38122B7=Point Reyes NE (485A) 38122B7;38122B8=Tomales (485B) 38122B8;38122A7=Inverness (485D) 38122A7;38122C4=Sonoma (500C) 38122C4;38122D6=Santa Rosa (501B) 38122D6;38122C6=Cotati (501C) 38122C6;38122D7=Sebastopol (502A) 38122D7;38122C8=Valley Ford (502C) 38122C8;38122C7=Two Rock (502D) 38122C7;38123D1=Duncans Mills (503A) 38123D1;38123D2=Arched Rock (503B) 38123D2;38122F7=Jimtown (518A) 38122F7;38122E7=Healdsburg (518D) 38122E7;38123F1=Warm Springs Dam (519A) 38123F1;39123D3=Willits (567A) 39123D3;39123C3=Laughlin Range (567D) 39123C3;39123D6=Noyo Hill (568B) 39123D6