Taxon Report

Calystegia macrostegia (Greene) Brummitt ssp. amplissima Brummitt

island morning-glory

Print Report

Taxon Summary

Calystegia macrostegia ssp. amplissima, commonly known as island morning-glory, is a perennial herb in the Convolvulaceae that is found only in California. It occurs within Coastal bluff scrub, Coastal dunes, and Valley and foothill grassland, growing at elevations from 10 to 275 meters. Calystegia macrostegia ssp. amplissima is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Classification


Scientific Name:	Calystegia macrostegia (Greene) Brummitt ssp. amplissima Brummitt
Common Name:	island morning-glory
Family:	Convolvulaceae
Element Code:	PDCON04081
USDA Plants Symbol:	CAMAA
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Feb-Jul	Feb-Jul
Elevation:	10-275 (35-900)
General Habitats:	Coastal bluff scrub, Coastal dunes, Valley and foothill grassland
Microhabitat:	Rocky
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.3
Global Rank:	G4G5T4
State Rank:	S4
State List:	None
Fed List:	None
Other Status:	SB_CalBG/RSABG
CRPR Changes:

Occurrence Data from the CNDDB


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

Location


California Endemic: True
California Counties and Islands: Name (Code)
Los Angeles (LAX), Santa Barbara (SBA), Ventura (VEN)
Quads: Name (Quad Code)
San Clemente Island Central (3211874), San Clemente Island North (3211885), San Clemente Island South (3211873), San Nicolas Island (3311924), Santa Barbara Island (3311848), Santa Catalina East (3311833), Santa Catalina South (3311834), Santa Cruz Island C (3311985)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	0 %

Notes



Relatively common and widespread where it occurs. See Kew Bulletin 35(2):327 (1980) for original description.
Threats:

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 9 May 2025].