Taxon Report

Sidalcea stipularis J.T. Howell & G. True

Scadden Flat checkerbloom

Print Report

Classification


Scientific Name:	Sidalcea stipularis J.T. Howell & G. True
Common Name:	Scadden Flat checkerbloom
Family:	Malvaceae
Element Code:	PDMAL110R0
USDA Plants Symbol:	SIST3
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial rhizomatous herb
Blooming Period: Jul-Aug	Jul-Aug
Elevation:	700-730 (2295-2395)
General Habitats:	Marshes and swamps
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G1
State Rank:	S1
State List:	CE
Fed List:	None
Other Status:	SB_CalBG/RSABG
CRPR Changes:

Occurrence Data from the CNDDB


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

Location


California Endemic: True
California Counties and Islands: Name (Code)
Nevada (NEV)
Quads: Name (Quad Code)
Chicago Park (3912028), Grass Valley (3912121)

Threat List Data from the CNDDB


Threat List Total:	6
EOs with Threat Listed:	Total EOs	% of EOs
	2	100 %
Altered flood/tidal/hydrologic regime	2	100%
Non-native plant impacts	2	100%
Other	2	100%
Road/trail construction/maint.	2	100%
Biocides	1	50%
Grazing	1	50%

Notes



Known from only two occurrences near Grass Valley. One occurrence voluntarily protected by landowner. Threatened by altered hydrology, grazing, mowing, and non-native plants. See Four Seasons 4(4):20-22 (1974) 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 8 January 2025].