Meadow Checker Mallow (Sidalcea campestris)
There are four varieties of the Sidalicea genus common to the Pacific Northwest, according to Turner & Gustafson’s Wildflowers of the Pacific Northwest. Other sources list more; some, apparently, are quite rare. This one was found in the nearby Portland suburb of Wilsonville, at the fairly new Graham Oaks Nature Park. These plants are in the mallow family (which includes Marsh Mallow, which was once used to flavor the treats of the same name), and are sometimes called “Checker Bloom” and “Hollyhock”.