Grimy ivesia is found on ash deposits or on widely-scattered outcrops of welded ash tuff. This species roots in shallow, weathered surface soil and cracks in the underlying bedrock.
Limiting factors
Grimy ivesia grows on potential gold-bearing deposits, so mining presents a serious threat to this species. Off-road vehicles and grazing also impact grimy ivesia.
Data gaps
Estimate the size of the four Oregon populations. Evaluate the effects of low precipitation on reproduction and survival. Develop a transplanting protocol.
Conservation actions
Survey suitable habitat to inform establishment of new populations. Limit insecticide spraying while plants are in bloom. Monitor populations to assess trends. Fence populations on public land to prevent cattle trampling.
