Taxon Details

Sidalcea hickmanii ssp. napensis

Napa checkerbloom

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Photo of Sidalcea hickmanii ssp. napensis

Taxon Summary:

Sidalcea hickmanii ssp. napensis, commonly known as Napa checkerbloom, is a perennial herb in the Malvaceae that is found only in California. It occurs within Chaparral, growing at elevations from 415 to 610 meters. Sidalcea hickmanii ssp. napensis is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification

Scientific Name: Sidalcea hickmanii Greene ssp. napensis S.R. Hill
Common Name: Napa checkerbloom
Family:	Malvaceae
Element Code:	PDMAL110A6
USDA Plants Symbol:
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.1
Fed List:	None
State List:	None
Global Rank:	G2T1
State Rank:	S1
Other Status:	SB_CalBG/RSABG
CRPR Changes: added to 1B.1 on 2009-04-02
Add Date:	2009-04-02
Date Edited:	2025-06-03

Ecology and Life History

Lifeform: perennial herb

Blooming Period: Apr-Jun

Elevation:
415 - 610 meters
1360 - 2000 feet

General Habitats:

Chaparral

Microhabitat Details: rhyolitic

Microhabitat:

Notes

Notes: Known from only 2 occurrences. Threatened by agriculture. See J. Bot. Res. Inst. Texas 2(2): 783-791 (2008) for original description.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	1
	Total EOs	% of EOs
EOs with Threat Listed:	1	50 %
Agriculture	1	50%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					2
A	B	C	D	X	U
0	0	0	0	0	2

Occurrence Status:
Historical >20 Years	2
Recent <=20 Years	0

Presence:
Presumed Extant	2
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Napa (NAP), Sonoma (SON)

Quads: Name (Quad Code)
Calistoga (3812255), Mt. George (3812232)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Presumed Extant

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CNPS Rare Plant Inventory