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Taxon  Report  
Hemizonia congesta  DC.  ssp. congesta 
Hayfield tarweed
Hemizonia congesta ssp. congesta is an annual herb that is native to California, and endemic (limited) to California.
also called Hemizonia congesta ssp. lutescens
California Rare Plant Rank: 1B.2 (rare, threatened, or endangered in CA and elsewhere).
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial
Observation Search
(1980 records)
yellowone or more occurrences
within a 7.5-minute quadrangle
bloom graphic
Bloom Period
Parent: Hemizonia congesta
Genus: Hemizonia
Family: Asteraceae  
Category: angiosperm  
PLANTS group:Dicot
Jepson eFlora section: eudicot

Ultramafic affinity: 1.3 - weak indicator / indifferent

Communities: Northern Coastal Scrub, Valley Grassland

Name Status:
Accepted by JEF + CNPS + PLANTS
Alternate Names:
JEF + CNPSHemizonia congesta ssp. leucocephala
JEFHemizonia congesta ssp. vernalis
CNPSHemizonia congesta
PLANTSHemizonia lutescens
PLANTSHemizonia luzulifolia var. lutescens
...
Information about  Hemizonia congesta ssp. congesta from other sources
Nursery availability from CNPLX
This plant is available commercially.
Jepson eFlora

USDA PLANTS Profile (HECOC2)

Photos on Calflora

Photos on CalPhotos

Google Images

Photos on iNaturalist

ID Tips on PlantID.net


Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals. [web application]. 2023. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 05/31/2023).