Taxon  Report   4066    
Hemizonia congesta  DC.  ssp. calyculata  Babc. & H. M. Hall
Hayfield tarweed,  Mendocino tarplant
Hemizonia congesta ssp. calyculata, a dicot, is an annual herb that is native to California, and is endemic (limited) to California.
also called Hemizonia calyculata
California Rare Plant Rank: 4.3 (limited distribution).   CNPS Inventory
Observation Search
(observation details)
one or more occurrences
within a 7.5-minute quadrangle

Bloom Period
Genus: Hemizonia
Parent: Hemizonia congesta
Serpentine affinity: 1.5; (weak indicator)

Communities: Valley Grassland, Foothill Woodland

Name Status:
Accepted by JEF + CNPS + PLANTS

Alternate Names:
JEF + CNPS + PLANTS: Hemizonia calyculata
More information about  Hemizonia congesta ssp. calyculata
Nursery availability from CNPLX
Commercial availability unknown.
Jepson eFlora


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]. 2019. Berkeley, California: The Calflora Database [a non-profit organization]. Available:   (Accessed: Nov 20, 2019).