Taxon Report

Sidalcea oregana (T. & G.) Gray ssp. eximia (Greene) Hitchc.

coast checkerbloom

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Taxon Summary

Sidalcea oregana ssp. eximia, commonly known as coast checkerbloom, is a perennial herb in the Malvaceae that is found only in California. It occurs within Lower montane coniferous forest, Meadows and seeps, and North Coast coniferous forest, growing at elevations from 5 to 1340 meters. Sidalcea oregana ssp. eximia is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.


  Classification

Scientific Name:
Sidalcea oregana (T. & G.) Gray ssp. eximia (Greene) Hitchc.
Common Name:
coast checkerbloom
Family: Malvaceae
Element Code: PDMAL110K9
USDA Plants Symbol: SIORE
Synonyms/Other Names:

Ecology and Life History

Lifeform: perennial herb
Blooming Period: Jun-Aug Jun-Aug
Elevation: 5-1340 (15-4395)
General Habitats: Lower montane coniferous forest, Meadows and seeps, North Coast coniferous forest
Microhabitat:
Microhabitat Details:

Occurrence Data from the CNDDB

Total Occurrences: 19
Element Occurrence Ranks:
   Excellent (A) 0
   Good (B) 1
   Fair (C) 5
   Poor (D) 1
   None (X) 0
   Unknown (U) 12
California Endemic:  True
California Counties and Islands: Name (Code)
Del Norte (DNT), Humboldt (HUM), Siskiyou (SIS), Trinity (TRI)
Quads: Name (Quad Code)
Arcata North (4012481), Board Camp Mtn. (4012366), Cannibal Island (4012463), Crescent City (4112472), Eureka (4012472), Fields Landing (4012462), Grouse Mtn. (4012376), Hopkins Butte (4112325), Iaqua Buttes (4012368), Mad River Buttes (4012367), Maple Creek (4012377), McConaughy Gulch (4112247), Salmon Mtn. (4112324), Smith River (4112482), Tish Tang Point (4112315), Trinity Mtn. (4112314), Weitchpec (4112326)

Threat List Data from the CNDDB

Threat List Total: 8
EOs with Threat Listed: Total EOs % of EOs
8 42 %
Logging 5 26%
Road/trail construction/maint. 3 15%
Grazing 2 10%
Non-native plant impacts 1 5%
Other 1 5%
Biocides 1 5%
Development 1 5%
Foot traffic/trampling 1 5%

Notes

Known from approximately ten occurrences. Possibly threatened by trampling. Intergrades with sspp. oregana and spicata. See University of Washington Publications in Biology 18:1-96 (1957) for taxonomic treatment.
Threats:
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].