Saxifraga | Senna occidentalis | Platanus occidentalis | Pimpinella saxifraga | Thuja occidentalis | Saxifraga mertensiana | Sarcoscypha occidentalis | Osmorhiza occidentalis | Linderiella occidentalis | Juniperus occidentalis | Euthamia occidentalis | Emblemariopsis occidentalis | Anemone occidentalis | A larval web in an inflorescence of ''Pimpinella saxifraga |
Associated plants include Alnus rubra, Filipendula occidentalis, Rubus parviflorus, Rubus spectabilis, Saxifraga occidentalis, Saxifraga nuttallii, Saxifraga mertensiana, and Mimulus guttatus, though it often grows on slopes with few other plants around.