Species Details

Ceanothus masonii

Mason's ceanothus

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Scientific Name:
Ceanothus masonii McMinn
Common Name:
Mason's ceanothus
Family: Rhamnaceae
Element Code: PDRHA04200
USDA Plants Symbol: CEMA3
Synonyms/Other Names:
CA Rare Plant Rank: 1B.2
Fed List: None
State List: CR (1978-11-01)
Global Rank: G1
State Rank:
S1
Other Status: SB_CalBG/RSABG; SB_USDA
CRPR Changes:
Add Date: 1974-01-01
Date Edited: 2021-05-26
Lifeform: perennial evergreen shrub
Blooming Period: Mar-Apr
Elevation:
230 - 500 meters
755 - 1640 feet
General Habitat:
  • Chaparral (openings, rocky, serpentinite)
General Micro Habitat:
Micro Habitat:
Notes:
Known from approximately five occurrences. Threatened by fire suppression. May be a variety of C. gloriosus; needs further study. See MadroƱo 6(5):171-173 (1942) for original description.
Threats:
Taxonomy:
Other:
Total Occurrences: 8
Element Occurrence Ranks:
A B C D X U
1 2 1 0 0 4
Occurrence Status:
Historical >20 Years 5
Recent <=20 Years 3
Presence:
Presumed Extant 8
Possibly Extirpated 0
Presumed Extirpated 0
California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Marin (MRN)
Quads: Name (Quad Code)
Bolinas (3712286), Petaluma (3812226), Point Reyes NE (3812227)
Notes:
Definitions of codes following a county and/or quad:
* Presumed extirpated
(?) Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Map

Presumed Extant
Counties   Quads