Taxon Report

Sidalcea hickmanii Greene ssp. hickmanii

Hickman's checkerbloom

Print Report

Taxon Summary

Sidalcea hickmanii ssp. hickmanii, commonly known as Hickman's checkerbloom, is a perennial herb in the Malvaceae that is found only in California. It occurs within Chaparral (openings), Cismontane woodland, and Coastal bluff scrub, growing at elevations from 335 to 1220 meters. Sidalcea hickmanii ssp. hickmanii is ranked 1B.3, Plants Rare, Threatened or Endangered in California and Elsewhere; Not very threatened in California.

Classification


Scientific Name:	Sidalcea hickmanii Greene ssp. hickmanii
Common Name:	Hickman's checkerbloom
Family:	Malvaceae
Element Code:	PDMAL110A2
USDA Plants Symbol:	SIHIH
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: May-Jul	May-Jul
Elevation:	335-1220 (1100-4005)
General Habitats:	Chaparral, Cismontane woodland, Coastal bluff scrub
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.3
Global Rank:	G2T2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	SB_SBBG; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	17
Element Occurrence Ranks:
Excellent (A)	1
Good (B)	6
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	10

Location


California Endemic: True
California Counties and Islands: Name (Code)
Monterey (MNT)
Quads: Name (Quad Code)
Alder Peak (3512183), Bear Canyon (3612113), Burnett Peak (3512172), Cosio Knob (3612112), Jolon (3512182), Junipero Serra Peak (3612124), Lopez Point (3612115), Reliz Canyon (3612123), Tassajara Hot Springs (3612125), Thompson Canyon (3612122)

Threat List Data from the CNDDB


Threat List Total:	8
EOs with Threat Listed:	Total EOs	% of EOs
	9	53 %
Road/trail construction/maint.	5	29%
Other	3	17%
Military operations	3	17%
Non-native plant impacts	2	11%
Feral pigs	1	5%
Foot traffic/trampling	1	5%
Grazing	1	5%
Wood cutting or brush clearing	1	5%

Notes



Threatened by road maintenance. Possibly threatened by fire suppression and grazing. See Fremontia 6(2):8-14 (1978) for discussion of Marble-Cone fire and effects.
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 24 June 2025].