Oregon Semaphore Grass

Photo Credit: Oregon Department of Agriculture


  • Species Common Name Oregon Semaphore Grass
  • Species Scientific Name Pleuropogon oregonus
  • Federal Listing Status Species of Concern
  • State Listing Status Threatened


Special needs

Oregon semaphore grass occurs in moist meadows and marshland, at around 3300-5600 feet in elevation. This species is found on gravelly silt loam or clay soil inundated by slow-moving water.

Limiting factors

Oregon semaphore grass is naturally rare, has low reproductive capacity, and persists in disjunct populations. This species is palatable to cows and vulnerable to grazing due to its shallow roots. Loss of habitat due to drainage for agricultural use is a key threat to this species.

Conservation actions

Manage grazing at occupied sites. Collect and store seed. Monitor current introductions into suitable habitat on public land.

Key reference or plan

Oregon Department of Agriculture Plant Conservation