- This 333-acre preserve contains one of the best remaining examples of the antelope bitterbrush/Idaho fescue communities that once flourished in eastern Washington. Spring wildflowers on Davis Canyon’s sloping hillsides include blanket-flower, desert yellow-daisy, lupines, mariposa lilies, death camas, yellow bells, shooting star, prairie-smoke and larkspur. This site was designated a National Natural Landmark by the National Park Service in 1986 in recognition of its nationwide significance to natural area protection. The Carlton Complex wildfire burned through virtually all of the preserve in 2014, removing most of the shrub cover but leaving an intact native grassland.