Several plant taxa are endemic to Steens Mountain, including Castilleja pilosa var. steenensis, Cirsium peckii, Draba cusickii var. cusickii, Penstemon davidsonii var. praeteritus, and Poa chambersii.
Castilleja | ''Castilleja pilosa'' var. ''steenensis'' | Castilleja pilosa | Bidens pilosa |