Taxon Report

Sidalcea hickmanii Greene ssp. pillsburiensis S.R. Hill

Lake Pillsbury checkerbloom

Print Report

Taxon Summary

Sidalcea hickmanii ssp. pillsburiensis, commonly known as Lake Pillsbury checkerbloom, is a perennial herb in the Malvaceae that is found only in California. It occurs within Chaparral, growing at elevations from 700 to 700 meters. Sidalcea hickmanii ssp. pillsburiensis is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Sidalcea hickmanii Greene ssp. pillsburiensis S.R. Hill
Common Name:	Lake Pillsbury checkerbloom
Family:	Malvaceae
Element Code:	PDMAL110A5
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Jul-Aug	Jul-Aug
Elevation:	700-700 (2295-2295)
General Habitats:	Chaparral
Microhabitat:	Openings
Microhabitat Details:	Franciscan soils

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G2T1
State Rank:	S1
State List:	None
Fed List:	None
Other Status:	USFS_S
CRPR Changes:	added to 1B.2 on 2009-02-04

Occurrence Data from the CNDDB


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

Location


California Endemic: True
California Counties and Islands: Name (Code)
Lake (LAK)
Quads: Name (Quad Code)
Lake Pillsbury (3912248)

Threat List Data from the CNDDB


Threat List Total:	1
EOs with Threat Listed:	Total EOs	% of EOs
	1	100 %
Other	1	100%

Notes



Known only from vicinity of Lake Pillsbury. See J. Bot. Res. Inst. Texas 2(2): 783-791 (2008) for original description.
Threats:
Potentially threatened by fire line maintenance.
Taxonomy:

Selected References

USFS Potential Species of Conservation Concern Profile

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].