CNPS.ORG Inventory of Rare and Endangered Plants - 7th edition interface
v7-18mar 3-19-18
Status: record ceanothus_masonii - Sat, Dec. 4, 2021, 03:16 ET b
Ceanothus masonii
common nameMason's ceanothus
CalPhotos image
more photos
© 1995 Doreen L. Smith  Follow image link for photo data.
life form evergreen shrub
CA Rare Plant Rank
List 1B.2
LIST 1B: Rare, threatened, or endangered in California and elsewhere.
     0.2: Fairly 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 listingRare  11/78
federal listingNone  
where found
MAPS - Use v8 link below.

Topographic quads (3):
Bolinas (467B) 3712286, Petaluma (484B) 3812226, Point Reyes NE (485A) 3812227
quad data info

Counties, states, regions:
Marin (MRN)
A reminder: Species not recorded for a given area may nonetheless be present, especially where favorable conditions occur.
CNPS habitats•Chaparral (Chprl)(openings, rocky, serpentinite)
blooming period Mar-Apr  
elevation range230 - 500 meters
Known from approximately five occurrences. Threatened by fire suppression. May be a variety of C. gloriosus; needs further study. See Madroņo 6(5):171-173 (1942) for original description.
full nameCeanothus masonii McMinn
Version 8    INVENTORY VERSION 8 interface for this taxon, including GIS and more links

Additional information:
standard acronym  CEMA3 Element Code  PDRHA04200
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, Dec. 4, 2021 from

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