Taxon Report

Calystegia purpurata (Greene) Brummitt ssp. saxicola (Eastw.) Brummitt

coastal bluff morning-glory

Print Report


Taxon Summary

Calystegia purpurata ssp. saxicola, commonly known as coastal bluff morning-glory, is a perennial herb in the Convolvulaceae that is found only in California. It occurs within Coastal bluff scrub, Coastal dunes, Coastal scrub, and North Coast coniferous forest, growing at elevations from 0 to 105 meters. Calystegia purpurata ssp. saxicola is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

  Classification
Scientific Name:
 Calystegia purpurata (Greene) Brummitt ssp. saxicola (Eastw.) Brummitt
Common Name:
 coastal bluff morning-glory
Family: Convolvulaceae
Element Code: PDCON040D2
USDA Plants Symbol: CAPUS
Synonyms/Other Names:

Ecology and Life History
Lifeform: perennial herb
Blooming Period: (Mar)Apr-Sep (Mar)Apr-Sep
Elevation: 0-105 (0-345)
General Habitats: Coastal bluff scrub, Coastal dunes, Coastal scrub, North Coast coniferous forest
Microhabitat:
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 1B.2
Global Rank: G4T2T3
State Rank:
 S2S3
State List: None
Fed List: None
Other Status: BLM_S; SB_UCSC
CRPR Changes:

Occurrence Data from the CNDDB
Total Occurrences: 42
Element Occurrence Ranks:
   Excellent (A) 3
   Good (B) 11
   Fair (C) 7
   Poor (D) 1
   None (X) 0
   Unknown (U) 20

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Contra Costa (CCA), Marin (MRN), Mendocino (MEN), Sonoma (SON)
Quads: Name (Quad Code)
Albion (3912327), Arched Rock (3812342), Bodega Head (3812331), Drakes Bay (3812218), Duncans Mills (3812341), Fort Bragg (3912347), Gualala (3812375), Mendocino (3912337), Plantation (3812353), Point Arena (3812386), Point Bonita (3712275), Richmond (3712283)?, Saunders Reef (3812376), Stewarts Point (3812364), Tomales (3812228), Valley Ford (3812238)

Threat List Data from the CNDDB

Threat List Total: 8
EOs with Threat Listed: Total EOs % of EOs
20 48 %
Non-native plant impacts 10 23%
Road/trail construction/maint. 6 14%
Foot traffic/trampling 5 11%
Grazing 5 11%
Development 4 9%
Other 3 7%
Recreational use (non-ORV) 1 2%
Erosion/runoff 1 2%

Notes
See Bulletin of the Torrey Botanical Club 30(9):495 (1903) for original description, and Annals of the Missouri Botanical Garden 52(2):214 (1965) for revised nomenclature.
Threats:
Threatened by development, foot traffic, and non-native plants. 
Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 10 May 2025].