CNPS

CNPS Rare Plant Inventory

Species Details

Ceanothus decornutus

Nicasio ceanothus

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Photo of Ceanothus decornutus
© 2014 Vernon Smith 		Photo of Ceanothus decornutus
© 2022 Roger Stephens 		Photo of Ceanothus decornutus
© 2015 Robert Steers

  Classification

Scientific Name:
Ceanothus decornutus V.T. Parker
Common Name:
Nicasio ceanothus
Family: Rhamnaceae
Element Code: PDRHA04440
USDA Plants Symbol:
Synonyms/Other Names:

  Conservation Status

CA Rare Plant Rank: 1B.2
Fed List: None
State List: None
Global Rank: G1
State Rank:
 S1
Other Status: SB_CalBG/RSABG
CRPR Changes:
added to 1B.2 on 2016-06-16
Add Date: 2016-06-16
Date Edited: 2023-08-01

  Ecology and Life History

Lifeform: perennial shrub
Blooming Period: Mar-May
JFMAMJJASOND
Elevation:
235 - 290 meters
770 - 950 feet
General Habitats:
  • Chaparral (maritime)
Microhabitat Details:
Microhabitat:
  • Clay (sometimes)
  • Rocky
  • Serpentinite

  Notes

Notes:
Discovered in the 1980’s by Wilma Follette. Similar to C. jepsonii; primarily differs from it in having 5-merous flowers that are white, light blue, or pink. See Madroño 61(4):399-406 (2014) for original description.
Threats:
Potentially threatened by non-native plants. Possibly threatened by insect herbivory.
Taxonomy:

  Threat List Data from the CNDDB

Threat List Total: 2
Total EOs % of EOs
EOs with Threat Listed: 1 50 %
THREAT LIST:
Non-native plant impacts 1 50%
Other 1 50%

  Occurrence Data from the CNDDB

Total Occurrences: 2
Element Occurrence Ranks:
A B C D X U
0 0 0 0 0 2
Occurrence Status:
Historical >20 Years 0
Recent <=20 Years 2
Presence:
Presumed Extant 2
Possibly Extirpated 0
Presumed Extirpated 0

  Location

California Endemic:
California Island:
States: Name (Code)
California (CA)
California Counties and Islands: Name (Code)
Marin (MRN)
Quads: Name (Quad Code)
San Geronimo (3812216)
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.
Regional Map

  Map

Presumed Extant
Click on quad for name. Hold Shift Key to use mouse scroll wheel

  Selected References

CNPS Status Review: Proposed Addition to CRPR 1B.2, G1 / S1 (2016)
Suggested Citation:
California Native Plant Society, Rare Plant Program. 2023. Rare Plant Inventory (online edition, v9.5). Website https://www.rareplants.cnps.org [accessed 27 September 2023].