Taxon Report

Ceanothus gloriosus J.T. Howell var. porrectus J.T. Howell

Mt. Vision ceanothus

Print Report

Classification


Scientific Name:	Ceanothus gloriosus J.T. Howell var. porrectus J.T. Howell
Common Name:	Mt. Vision ceanothus
Family:	Rhamnaceae
Element Code:	PDRHA040F7
USDA Plants Symbol:	CEGLP
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial evergreen shrub
Blooming Period: Feb-May	Feb-May
Elevation:	25-305 (80-1000)
General Habitats:	Closed-cone coniferous forest, Coastal prairie, Coastal scrub, Valley and foothill grassland
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.3
Global Rank:	G4T2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	SB_CalBG/RSABG
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	18
Element Occurrence Ranks:
Excellent (A)	1
Good (B)	10
Fair (C)	2
Poor (D)	0
None (X)	0
Unknown (U)	5

Location


California Endemic: True
California Counties and Islands: Name (Code)
Marin (MRN)
Quads: Name (Quad Code)
Drakes Bay (3812218), Inverness (3812217), Tomales (3812228)

Threat List Data from the CNDDB


Threat List Total:	8
EOs with Threat Listed:	Total EOs	% of EOs
	13	72 %
Other	8	44%
Grazing	7	38%
Foot traffic/trampling	3	16%
Road/trail construction/maint.	2	11%
Vandalism/dumping/litter	1	5%
Erosion/runoff	1	5%
Mining	1	5%
Non-native plant impacts	1	5%

Notes



Known from fewer than 20 occurrences in the Mt. Vision area near Pt. Reyes. Some plants destroyed by quarrying; occurs in areas grazed by cattle. Possibly threatened by competition. Can intergrade with Ceanothus gloriosus var. gloriosus.
Threats:

Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2024. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 25 December 2024].