Taxon Report

Sidalcea gigantea G.L. Clifton, R.E. Buck & S.R. Hill

giant checkerbloom

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©2018 Sierra Pacific Industries

Taxon Summary

Sidalcea gigantea, commonly known as giant checkerbloom, is a perennial rhizomatous herb in the Malvaceae that is found only in California. It occurs within Lower montane coniferous forest, and Upper montane coniferous forest, growing at elevations from 670 to 1950 meters. Sidalcea gigantea is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

  Classification
Scientific Name:
 Sidalcea gigantea G.L. Clifton, R.E. Buck & S.R. Hill
Common Name:
 giant checkerbloom
Family: Malvaceae
Element Code: PDMAL110T0
USDA Plants Symbol: SIGI
Synonyms/Other Names:

Ecology and Life History
Lifeform: perennial rhizomatous herb
Blooming Period: (Jan-Jun)Jul-Oct (Jan-Jun)Jul-Oct
Elevation: 670-1950 (2200-6400)
General Habitats: Lower montane coniferous forest, Upper montane coniferous forest
Microhabitat: Seeps
Microhabitat Details: Meadows

Conservation Status
CA Rare Plant Rank: 4.3
Global Rank: G3
State Rank:
 S3
State List: None
Fed List: None
Other Status:
CRPR Changes:
  • added to 4.3 on 2012-07-10

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

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Butte (BUT), Nevada (NEV), Plumas (PLU), Shasta (SHA), Sierra (SIE), Tehama (TEH), Yuba (YUB)
Quads: Name (Quad Code)
American House (3912161), Berry Creek (3912164), Blue Canyon (3912036), Burney (4012186), Burney Mtn. West (4012176), Butte Meadows (4012115), Cascade (3912162), Chalk Mtn. (4012187), Challenge (3912142), Clipper Mills (3912152), Colfax (3912018), Goodyears Bar (3912058), Grays Peak (4012146), Hagaman Gulch (4012157), Haskins Valley (3912172), Hatchet Mtn. Pass (4012177), Inwood (4012158), Kimshew Point (3912184), Manton (4012147), Miller Mtn. (4012167), Pike (3912048), Pulga (3912174), Rackerby (3912143), Soapstone Hill (3912173), Stirling City (3912185), Storrie (3912183), Strawberry Valley (3912151), Viola (4012156)

Threat List Data from the CNDDB

Threat List Total: 0
EOs with Threat Listed: Total EOs % of EOs
0 0 %

Notes
Potentially threatened by fire suppression. Possibly threatened by logging, road construction, and road maintenance. Similar to S. asprella and S. celata. See American Journal of Botany 90(3):436-444 (2003) and Molecular Phylogenetics and Evolution 29:563-581 (2003) for taxonomic treatments, and Madroño 56(4):285-292 (2009) for original description.
Threats:
Potentially threatened by fire suppression. Possibly threatened by logging, road construction, and road maintenance.
Taxonomy:
Similar to S. asprella and S. celata.

Selected References

CRPR List Addition on 2012-07-10
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].