Taxon Report

Sidalcea keckii Wiggins

Keck's checkerbloom

Print Report

Taxon Summary

Sidalcea keckii, commonly known as Keck's checkerbloom, is a annual herb in the Malvaceae that is found only in California. It occurs within Cismontane woodland, and Valley and foothill grassland, growing at elevations from 75 to 650 meters. Sidalcea keckii is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Sidalcea keckii Wiggins
Common Name:	Keck's checkerbloom
Family:	Malvaceae
Element Code:	PDMAL110D0
USDA Plants Symbol:	SIKE
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Apr-May(Jun)	Apr-May(Jun)
Elevation:	75-650 (245-2135)
General Habitats:	Cismontane woodland, Valley and foothill grassland
Microhabitat:	Clay, Serpentine
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G2
State Rank:	S2
State List:	None
Fed List:	FE
Other Status:	SB_CalBG/RSABG
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	50
Element Occurrence Ranks:
Excellent (A)	2
Good (B)	0
Fair (C)	0
Poor (D)	1
None (X)	1
Unknown (U)	46

Location


California Endemic: True
California Counties and Islands: Name (Code)
Colusa (COL)?, Fresno (FRE), Glenn (GLE), Lake (LAK), Merced (MER), Napa (NAP)?, Solano (SOL)?, Tulare (TUL), Yolo (YOL)?
Quads: Name (Quad Code)
Allendale (3812148), Antioch North (3812117), Bird Valley (3812271), Birds Landing (3812127)?, Capell Valley (3812242), Denverton (3812128), Elk Creek (3912255), Gilmore Peak (3912235)?, Globe (3611817), Guinda (3812272), Humphreys Station (3611984), Jericho Valley (3812274)?, Knoxville (3812273)?, Lake Berryessa (3812252), Lodoga (3912234)?, Merced (3712034), Merritt (3812157), Monticello Dam (3812251)?, Mt. Vaca (3812241), Piedra (3611974), Pine Flat Dam (3611973), Salt Canyon (3912213), Saxon (3812146), Stonyford (3912245), Success Dam (3611818)*, Walter Springs (3812263), White River (3511877), Winters (3812158), Yosemite Lake (3712044)

Threat List Data from the CNDDB


Threat List Total:	6
EOs with Threat Listed:	Total EOs	% of EOs
	6	12 %
Grazing	2	4%
Non-native plant impacts	2	4%
Other	1	2%
Road/trail construction/maint.	1	2%
Agriculture	1	2%
Development	1	2%

Notes



Rediscovered in 1992 by J. Stebbins and K. Kirkpatrick. Plants from inner north coast ranges may actually be S. diploscypha; needs study. See Contributions from the Dudley Herbarium 3:55-56 (1940) 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 5 February 2025].