CNPS.ORG Inventory of Rare and Endangered Plants - 7th edition interface
v7-18mar 3-19-18
Status: record hemizonia_congesta_ssp._congesta - Sun, Dec. 5, 2021, 19:04 ET b
Hemizonia congesta ssp. congesta
common namecongested-headed hayfield tarplant
CalPhotos image
more photos
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life formannual herb
CA Rare Plant Rank
List 1B.2
LIST 1B: Rare, threatened, or endangered in California and elsewhere.
     0.2: Fairly endangered in California
state rank
S1S2   S1S2: Intermediate between S1 and S2
global rank
G5T1T2      ranking system key
CA state listingNone  
federal listingNone  
where found
MAPS - Use v8 link below.

Topographic quads (32):
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
quad data info

Counties, states, regions:
Lake (LAK), Mendocino (MEN), Marin (MRN), San Francisco (SFO), San Mateo (SMT), Sonoma (SON)
A reminder: Species not recorded for a given area may nonetheless be present, especially where favorable conditions occur.
CNPS habitats•Valley and foothill grassland (VFGrs)/sometimes roadsides
blooming period Apr-Nov  
elevation range20 - 560 meters
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.
full nameHemizonia congesta DC. ssp. congesta
Version 8    INVENTORY VERSION 8 interface for this taxon, including GIS and more links

Additional information:
standard acronym  HECOC2 Element Code  PDAST4R065
CalFlora species this taxon    CalFlora genus related taxa
Jepson Online Jepson Interchange  Jepson Manual and other resources
Google search
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Suggested citation: California Native Plant Society (CNPS). 2018. Inventory of Rare and Endangered Plants (online edition, v7-18mar). California Native Plant Society. Sacramento, CA. Accessed on Sun, Dec. 5, 2021 from

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