CNPS.ORG Inventory of Rare and Endangered Plants - 7th edition interface
v7-18mar 3-19-18
Status: record holocarpha_macradenia - Sat, Nov. 27, 2021 12:12 ET c
Holocarpha macradenia
common nameSanta Cruz tarplant
CalPhotos image
more photos
Charles Webber © 1998 California Academy of Sciences  Follow image link for photo data.
life formannual herb
CA Rare Plant Rank
List 1B.1
LIST 1B: Rare, threatened, or endangered in California and elsewhere.
     0.1: Seriously endangered in California
state rank
S1      ranking system key
global rank
G1     G1: Less than 6 occurrences OR less than 1,000 individuals OR less than 2,000 acres.
Where did the "RED" code go?
CA state listingEndangered  09/79
federal listingThreatened  03/20/00
where found
MAPS - Use v8 link below.

Topographic quads (13):
Watsonville East (386B) 3612186, Prunedale (386C) 3612176, Watsonville West (387A) 3612187, Soquel (387B) 3612188, Santa Cruz (387E) 3612281, Laurel (407C) 3712118, Felton (408D) 3712211, Hayward (447A)* 3712261, Briones Valley (465B) 3712282, Richmond (466A)* 3712283, Oakland West (466D)* 3712273, San Rafael (467A)* 3712285, Mare Island (483D)* 3812213
quad data info

Counties, states, regions:
Alameda (ALA)*, Contra Costa (CCA)*, Monterey (MNT), Marin (MRN)*, Santa Cruz (SCR), Solano (SOL)
A reminder: Species not recorded for a given area may nonetheless be present, especially where favorable conditions occur.
CNPS habitats•Coastal prairie (CoPrr)
•Coastal scrub (CoScr)
•Valley and foothill grassland (VFGrs)/often clay, sandy
blooming period Jun-Oct  
elevation range10 - 220 meters
All extant CCA Co. occurrences (465B, 466A) are introduced; nearly half have failed. Last remaining natural population in the S.F. Bay Area extirpated by development in 1993. Seriously threatened by urbanization, agriculture, non-native plants, and lack of appropriate ecological disturbance. See Fremontia 5(4):15-16 (1978) for species account.
full nameHolocarpha macradenia (DC.) Greene
Version 8    INVENTORY VERSION 8 interface for this taxon, including GIS and more links

Additional information:
standard acronym  HOMA Element Code  PDAST4X020
CalFlora species this taxon    CalFlora genus related taxa
Jepson Online Jepson Interchange  Jepson Manual and other resources
Google search
search Google CNPS website    search Google entire web

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 Sat, Nov. 27, 2021 from

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