Arrow-leaf thelypody occurs with western junipers along streambanks, seasonally-moist areas, seeps, and under isolated juniper trees away from obvious moisture.
Limiting factors
Arrow-leaf thelypody is endemic to the tributaries of the John Day River. This species is palatable to cattle and sensitive to grazing pressure.
Data gaps
Conduct additional inventories to determine population size and distribution. Study soil moisture relationships. Determine germination and propagation requirements.
Conservation actions
Minimize grazing at priority sites. Collect and store seeds.
