The western paintbrush is often associated with tufted hairgrass (Deschampsia caespitosa), golden avens (Geum rossii), and Bellard kobresia (Kobresia myosuroides)
Castilleja | Senna occidentalis | Platanus occidentalis | ''Castilleja pilosa'' var. ''steenensis'' | Castilleja pilosa | Thuja occidentalis | Sarcoscypha occidentalis | Osmorhiza occidentalis | Linderiella occidentalis | Juniperus occidentalis | Euthamia occidentalis | Emblemariopsis occidentalis | Anemone occidentalis |