Taxon Report

Calystegia atriplicifolia Hallier f. ssp. buttensis Brummitt

Butte County morning-glory

Print Report

Taxon Summary

Calystegia atriplicifolia ssp. buttensis, commonly known as Butte County morning-glory, is a perennial rhizomatous herb in the Convolvulaceae that is found only in California. It occurs within Chaparral, Lower montane coniferous forest, and Valley and foothill grassland, growing at elevations from 565 to 1524 meters. Calystegia atriplicifolia ssp. buttensis is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

Classification


Scientific Name:	Calystegia atriplicifolia Hallier f. ssp. buttensis Brummitt
Common Name:	Butte County morning-glory
Family:	Convolvulaceae
Element Code:	PDCON04012
USDA Plants Symbol:	CAATB
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial rhizomatous herb
Blooming Period: May-Jul	May-Jul
Elevation:	565-1524 (1855-5000)
General Habitats:	Chaparral, Lower montane coniferous forest, Valley and foothill grassland
Microhabitat:	Roadsides (sometimes), Rocky
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.2
Global Rank:	G5T3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	changed from 1B.2 to 4.2 on 2009-04-30

Occurrence Data from the CNDDB


Total Occurrences:	121
Element Occurrence Ranks:
Excellent (A)	3
Good (B)	34
Fair (C)	16
Poor (D)	4
None (X)	0
Unknown (U)	64

Location


California Endemic: True
California Counties and Islands: Name (Code)
Butte (BUT), Del Norte (DNT), Mendocino (MEN)?, Shasta (SHA), Tehama (TEH)
Quads: Name (Quad Code)
Barkley Mtn. (4012126), Bell Springs (3912385), Big Bend (4112118), Butte Meadows (4012115), Chalk Mtn. (4012187), Cohasset (3912186), Devils Parade Ground (4012116), Devils Rock (4012271), Goose Gap (4012281), Hatchet Mtn. Pass (4012177), Hiouchi (4112471), Ishi Caves (4012117), Jonesville (4012114), Kimshew Point (3912184), Montgomery Creek (4012178), Onion Butte (4012125), Paradise East (3912175), Paradise West (3912176), Roaring Creek (4012188), Shoeinhorse Mtn. (4112211), Stirling City (3912185)

Threat List Data from the CNDDB


Threat List Total:	10
EOs with Threat Listed:	Total EOs	% of EOs
	75	62 %
Road/trail construction/maint.	48	39%
Logging	45	37%
Biocides	16	13%
Other	9	7%
ORV activity	2	1%
Development	1	0%
Erosion/runoff	1	0%
Foot traffic/trampling	1	0%
Grazing	1	0%
Improper burning regime	1	0%

Notes



Possibly threatened by logging and road maintenance. Can be variable. Plants from DNT Co. intermediate to ssp. atriplicifolia, and plants from MEN Co. (600A) need confirmation. See Kew Bulletin 35(2):327 (1980) for original description.
Threats:

Taxonomy:

Selected References

Proposed Rank Change from CRPR 1B.2 to 4.2 (2009)

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 January 2025].