Calflora
Taxon  Report   4066    
Hemizonia congesta  DC.  ssp. calyculata  Babc. & H. M. Hall
Hayfield tarweed,  Mendocino tarplant
Hemizonia congesta ssp. calyculata
© 2015 John Doyen
Photos from
CalPhotos / Calflora
Hemizonia congesta ssp. calyculata
© 2015 John Doyen
Hemizonia congesta ssp. calyculata
© 2015 John Doyen
Hemizonia congesta ssp. calyculata, a dicot, is an annual herb that is native to California, is endemic (limited) to California.
also called Hemizonia calyculata
CNPS Rare Plant Rank: 4.3 (limited distribution).   8th Edition

Interactive Distribution Map


Observation Hotline
(observation details)



point, line, or polygon

one or more occurrences
within a 7.5-minute quadrangle

Plant Characteristics
and Associations



Bloom Period
Hemizonia congesta ssp. calyculata
© © 2015 John Doyen
Family: ASTERACEAE  
Genus: Hemizonia
Parent: Hemizonia congesta
Communities: Valley Grassland, Foothill Woodland

Serpentine affinity: 1.5; (weak indicator)

Name Status:
Accepted by JEF + CNPS + PLANTS

Alternate Names:
CNPS + PLANTS: Hemizonia calyculata
More information about  Hemizonia congesta ssp. calyculata
Nursery / seed vendor availability from CNPLX
Commercial availability unknown.
Landscaping information from Calscape
Photos on Google Images
Jepson eFlora

Records from the Consortium of California Herbaria

ITIS Original Publication citation

USDA PLANTS Profile (HECOC5)

Search the International Plants Names Index

Search efloras.org (Flora of North America)

website references from Google


Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. [web application]. 2018. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: Dec 16, 2018).