CNPS Inventory Plant Detail

*The database used to provide updates to the Online Inventory is under construction. View updates and changes made since May 2019 here.

Hemizonia congesta ssp. congesta

Common Name:	congested-headed hayfield tarplant
Family:	Asteraceae
Synonyms:	Hemizonia congesta, Hemizonia congesta ssp. leucocephala
Element Code:	PDAST4R065
Full Name:	Hemizonia congesta DC. ssp. congesta
USDA PLANTS Symbol:	HECOC2

2015 John Doyen

Biology
Lifeform: annual herb Blooming Period: Apr-Nov Habitat: sometimes roadsides. • Valley and foothill grassland

Rarity Status
California Rare Plant Rank: 1B.2 Rare or endangered in California and elsewhere .2: Fairly endangered in California Federal Listing Status: Not Listed State Listing Status: Not Listed State Rank: S2 S2: Imperiled. Global Rank: G5T2 T2: Imperiled. G5: (species) Secure, considering populations outside California.

Occurrence Data from CDFW
California Natural Diversity Database

Total # of Known Element Occurrences: 52
Element Occurrence Ranks:

A B C D X U

1 5 3 1 4 38

Population Status:

Historic >20 yrs	Recent <=20 yrs
40	12

Presence:

Present Extant	Possibly Extirpated	Presumed Extirpated
48	3	1

Notes
Threatened by agriculture, development, and road construction. Possibly threatened by grazing. Hybridizes with H. congesta ssp. lutescens. 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: 2018-06-28

Location

Elevation: 20 - 560 meters

California Endemic: yes

Other States:

California Counties and Islands: name (code)
Lake (LAK), Mendocino (MEN), Marin (MRN), San Francisco (SFO), San Mateo (SMT), Sonoma (SON)

Quads: name (DWR code) USGS code
San Francisco South (448B) 3712264, San Francisco North (466C) 3712274, San Rafael (467A) 3712285, Bolinas (467B) 3712286, Sears Point (483B) 3812224, Petaluma River (484A) 3812225, Petaluma (484B) 3812226, San Geronimo (484C) 3812216, Novato (484D) 3812215, Point Reyes NE (485A) 3812227, Tomales (485B) 3812228, Inverness (485D) 3812217, Sonoma (500C) 3812234, Santa Rosa (501B) 3812246, Cotati (501C) 3812236, Glen Ellen (501D) 3812235, Sebastopol (502A) 3812247, Camp Meeker (502B) 3812248, Valley Ford (502C) 3812238, Two Rock (502D) 3812237, Duncans Mills (503A) 3812341, Arched Rock (503B) 3812342, Bodega Head (503D) 3812331, Mark West Springs (517C) 3812256, Jimtown (518A) 3812267, Healdsburg (518D) 3812257, Warm Springs Dam (519A) 3812361, Middletown (533D) 3812275, Cloverdale (535D) 3812371, Willits (567A) 3912343, Laughlin Range (567D) 3912333, Noyo Hill (568B) 3912346

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. This data should NOT be substituted for pre-project review or for on-site surveys.

Presumed Extant

Presumed Extirpated or Unknown

147

Links to Leading Resources of Taxon Information
USDA PLANTS Calflora Consortium of California Herbaria CalPhotos California Department of Fish and Wildlife: CNDDB Quick Viewer

Suggested Citation
California Native Plant Society, Rare Plant Program. . Inventory of Rare and Endangered Plants of California (online edition, v8-03). Website http://www.rareplants.cnps.org [accessed ].

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