Nelson’s Checkermallow

Photo Credit: Oregon Department of Agriculture


  • Species Common Name Nelson's Checkermallow
  • Species Scientific Name Sidalcea nelsoniana
  • Federal Listing Status Threatened
  • State Listing Status Threatened


Special needs

Nelson's checkermallow occurs in wet and dry prairies, wetlands, edges of woodlands, and riparian areas. Remnant populations occur in roadsides and ditches.

Limiting factors

The primary threats to Nelson's checkermallow include habitat loss, habitat degradation due to fire suppression, and competition from invasive plants. Overspray of herbicides and severe seed predation by weevils are among additional risk factors.

Conservation actions

Maintain or restore grass-dominated habitat. Maintain or restore hydrology. Control key invasive plants. Use mowing or prescribed fire to control brush and trees. Maintain populations in roadsides and ditches.

Key reference or plan

Oregon Department of Agriculture Plant Conservation