Taxon  Report   4205    
Holocarpha macradenia  (DC.) Greene
Santa cruz tarplant
Holocarpha macradenia
© 2001 John Game
Photos from
CalPhotos / Calflora
Holocarpha macradenia
© 2018 Zachariah Jordan
Holocarpha macradenia
© 2018 Zachariah Jordan
Holocarpha macradenia, a dicot, is an annual herb that is native to California, is endemic (limited) to California.
CNPS Rare Plant Rank: 1B.1 (rare, threatened, or endangered in CA and elsewhere).   8th Edition

It is listed by the State of California as Endangered and by the Federal Government as 'Threatened '.

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
Holocarpha macradenia
© 2017 Adam Chasey
Genus: Holocarpha
Communities: Coastal Prairie, Valley Grassland
Name Status:
Accepted by JEF + CNPS + PLANTS

Alternate Names:
ICPN: Hemizonia macradenia
More information about  Holocarpha macradenia
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


Search the International Plants Names Index

Search (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]. 2019. Berkeley, California: The Calflora Database [a non-profit organization]. Available:   (Accessed: Jan 21, 2019).