Species Details

Centromadia parryi ssp. congdonii

Congdon's tarplant

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Scientific Name:
Centromadia parryi (Greene) Greene ssp. congdonii (Rob. & Greenm.) B.G. Baldwin
Common Name:
Congdon's tarplant
Family: Asteraceae
Element Code: PDAST4R0P1
USDA Plants Symbol: CEPAC
Synonyms/Other Names:
CA Rare Plant Rank: 1B.1
Fed List: None
State List: None
Global Rank: G3T2
State Rank:
Other Status:
CRPR Changes:
changed from 1B.2 to 1B.1 on 2012-11-05
Add Date: 1994-01-01
Date Edited: 2024-04-10
Lifeform: annual herb
Blooming Period: (Apr)May-Oct(Nov)
0 - 230 meters
0 - 755 feet
General Habitats:
  • Valley and foothill grassland (alkaline)
Microhabitat Details:
Severely threatened by development. Possibly threatened by grazing and non-native plants. A synonym of Hemizonia parryi ssp. congdonii in TJM (1993). See Botanical Gazette 22:169 (1896) for original description, and Novon 9:462-471 (1999) for revised nomenclature.
Threat List Total: 18
Total EOs % of EOs
EOs with Threat Listed: 76 78 %
Development 38 38%
Other 21 21%
Grazing 20 20%
Road/trail construction/maint. 15 15%
Non-native plant impacts 12 12%
Total Occurrences: 98
Element Occurrence Ranks:
9 17 32 14 15 11
Occurrence Status:
Historical >20 Years 54
Recent <=20 Years 44
Presumed Extant 83
Possibly Extirpated 6
Presumed Extirpated 9
California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Alameda (ALA), Contra Costa (CCA), Monterey (MNT), San Luis Obispo (SLO), San Mateo (SMT), Santa Clara (SCL), Santa Cruz (SCR)*, Solano (SOL)*
Quads: Name (Quad Code)
Altamont (3712166), Arroyo Grande NE (3512025), Benicia (3812212)*, Byron Hot Springs (3712176), Calaveras Reservoir (3712147), Chualar (3612155), Diablo (3712178), Dublin (3712168), Gonzales (3612154), Hayward (3712261)*, Livermore (3712167), Los Gatos (3712128), Milpitas (3712148), Moss Landing (3612177), Mountain View (3712241), Natividad (3612165), Newark (3712251), Niles (3712158), Palo Alto (3712242), Palo Escrito Peak (3612144)*, Pismo Beach (3512026), Prunedale (3612176)(?), Salinas (3612166), San Jose East (3712137)*, San Jose West (3712138), San Leandro (3712262)*, San Luis Obispo (3512036), Santa Teresa Hills (3712127), Seaside (3612157), Soledad (3612143), Spreckels (3612156), Tassajara (3712177), Vine Hill (3812211), Walnut Creek (3712281)*, Watsonville East (3612186)*, Watsonville West (3612187)
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
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