Taxon Report

Calystegia stebbinsii Brummitt

Stebbins' morning-glory

Print Report

Taxon Summary

Calystegia stebbinsii, commonly known as Stebbins' morning-glory, is a perennial rhizomatous herb in the Convolvulaceae that is found only in California. It occurs within Chaparral (openings), and Cismontane woodland, growing at elevations from 185 to 1090 meters. Calystegia stebbinsii is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Calystegia stebbinsii Brummitt
Common Name:	Stebbins' morning-glory
Family:	Convolvulaceae
Element Code:	PDCON040H0
USDA Plants Symbol:	CAST21
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial rhizomatous herb
Blooming Period: Apr-Jul	Apr-Jul
Elevation:	185-1090 (605-3575)
General Habitats:	Chaparral, Cismontane woodland
Microhabitat:	Gabbroic (sometimes), Seeps (sometimes)
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G1
State Rank:	S1
State List:	CE
Fed List:	FE
Other Status:	SB_CalBG/RSABG
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	15
Element Occurrence Ranks:
Excellent (A)	1
Good (B)	2
Fair (C)	7
Poor (D)	1
None (X)	4
Unknown (U)	0

Location


California Endemic: True
California Counties and Islands: Name (Code)
El Dorado (ELD), Nevada (NEV)
Quads: Name (Quad Code)
Coloma (3812078), Grass Valley (3912121), Pilot Hill (3812171), Rough And Ready (3912122), Shingle Springs (3812068)

Threat List Data from the CNDDB


Threat List Total:	11
EOs with Threat Listed:	Total EOs	% of EOs
	14	93 %
Development	14	93%
Road/trail construction/maint.	7	46%
Non-native plant impacts	5	33%
Vandalism/dumping/litter	4	26%
ORV activity	3	20%
Improper burning regime	2	13%
Biocides	2	13%
Landfill	1	6%
Erosion/runoff	1	6%
Foot traffic/trampling	1	6%
Recreational use (non-ORV)	1	6%

Notes



Threatened by development, vehicles, road maintenance, clearing, and alteration of fire regimes; possibly threatened by non-native plants. See Kew Bulletin 29:499 (1975) 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 2 February 2025].