Species Details

Centromadia parryi ssp. congdonii

Congdon's tarplant

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Classification

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: Hemizonia parryi Greene ssp. congdonii (Rob. & Greenm.) Keck

Conservation Status

CA Rare Plant Rank:	1B.1
Fed List:	None
State List:	None
Global Rank:	G3T2
State Rank:	S2
Other Status:	BLM_S; SB_CalBG/RSABG
CRPR Changes:
Add Date:	1994-01-01
Date Edited:	2024-05-09

Ecology and Life History

Lifeform: annual herb

Blooming Period: (Apr)May-Oct(Nov)

Elevation:
0 - 230 meters
0 - 755 feet

General Habitats:

Valley and foothill grassland (alkaline)

Microhabitat Details:

Microhabitat:

Notes

Notes: 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.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
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%
Foot traffic/trampling	10	10%
Disking	9	9%
Agriculture	9	9%
Recreational use (non-ORV)	6	6%
Biocides	4	4%
ORV activity	4	4%
Vandalism/dumping/litter	2	2%
Waterway bank protection/maintenance	1	1%
Altered flood/tidal/hydrologic regime	1	1%
Erosion/runoff	1	1%
Hybridization	1	1%
Improper burning regime	1	1%
Military operations	1	1%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					98
A	B	C	D	X	U
9	17	32	14	15	11

Occurrence Status:
Historical >20 Years	55
Recent <=20 Years	43

Presence:
Presumed Extant	83
Possibly Extirpated	6
Presumed Extirpated	9

Location

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)

Notes:

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.

Regional Map

Map

Presumed Extant

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CNPS Rare Plant Inventory