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Taxon  Report  
Sidalcea oregana  (Torr. & A. Gray) A. Gray
Oregon checker mallow,   Oregon checkerbloom
Sidalcea oregana is a perennial herb that is native to California, and also found elsewhere in western North America.
Siskiyou Del Norte Modoc Humboldt Shasta Lassen Trinity Plumas Tehama Butte Mendocino Glenn Sierra Yuba Lake Nevada Colusa Placer Sutter El Dorado Yolo Alpine Napa Sonoma Sacramento Mono Amador Solano Calaveras Tuolumne San Joaquin Marin Contra Costa Alameda Santa Cruz Mariposa Madera San Francisco San Mateo Merced Fresno Stanislaus Santa Clara Inyo San Benito Tulare Kings Monterey San Bernardino San Luis Obispo Kern Santa Barbara Ventura Los Angeles Riverside Orange San Diego Imperial
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Bloom Period
Subspecies and Varieties:
Genus: Sidalcea
Family: Malvaceae  
Category: angiosperm  
PLANTS group:Dicot
Jepson eFlora section: eudicot

Wetlands: Occurs usually in wetlands, occasionally in non wetlands

Habitat: freshwater-marsh

Communities: Freshwater Wetlands, Sagebrush Scrub, Redwood Forest, Yellow Pine Forest, Red Fir Forest, Lodgepole Forest, Mixed Evergreen Forest, wetland-riparian

Name Status:
Accepted by JEF + PLANTS

Information about  Sidalcea oregana from other sources
Nursery availability from CNPLX
This plant is available commercially.
Jepson eFlora

USDA PLANTS Profile (SIOR)

Photos on Calflora

Photos on CalPhotos

Google Images

Photos on iNaturalist

ID Tips on PlantID.net

[Wikipedia] Distribution, Description, Subspecies, Ecology: Sidalcea oregana is a species of flowering plant in the mallow family known by the common name Oregon checkerbloom.[1] Distribution It is native to western North America from British Columbia to California to Utah, where it grows in a number of moist habitat types, such as marshes and meadows. The plant is somewhat variable in appearance, and the species is divided into a few subspecies; some authors also recognize varieties within subspecies. In general, this is a perennial herb growing to maximum heights well over one meter from a woody taproot. Description Sidalcea oregana is usually hairy in texture, the hairs thick and bristly toward the base of the stem. Most of the leaves are located low on the stem, basal or on long petioles.[2] Their blades are usually deeply divided into lobes; upper leaves may be divided further into leaflets. The inflorescence is a dense or open spikelike raceme of many flowers. Each flower has five pink petals up to 2 centimeters long, usually notched at the end, and a central tube of reproductive parts. Subspecies include: Sidalcea oregana var. calva. Wenatchee Mountains checkermallow, endemic to the Wenatchee Mountains of Washington and a federally listed Endangered species. Sidalcea oregana ssp. eximia. Coast checkerbloom, endemic to about 10 populations in northwestern California, a Critically endangered species on the California Native Plant Society Inventory of Rare and Endangered Plants.[4][5][6] Sidalcea oregana ssp. hydrophila Sidalcea oregana ssp. oregana Sidalcea oregana ssp. spicata. Spicate checkerbloom or bog mallow,[7] widespread in meadows or streamsides of the Sierra and Cascades in California, below 10,000 ft (3,000 m).[2][3][8] Sidalcea oregana ssp. valida. Kenwood Marsh checkerbloom, known only from two marshes in Sonoma County, California, a federal, state, and CNPS listed endangered species.[9][10][11] Ecology It is a larval host to the West Coast lady.[12] (contributed by Mary Ann Machi)


Suggested Citation
Calflora: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals. [web application]. 2024. Berkeley, California: The Calflora Database [a non-profit organization]. Available: https://www.calflora.org/   (Accessed: 05/29/2024).