Squashberry is a deciduous shrub very similar to V. trilobum. Both are native and share the common name "Highbush Cranberry", but Squashberry is more common in wet areas of the Pacific Northwest. It's also very similar to the introduced European Highbush Cranberry. See V. trilobum for an explanation.
Squashberry grows in riparian areas such as wet forests, swamps, and waters edge. White flowers (cymes) bloom May to July and are fertile (unlike both of its cousins). The fruit starts green, turning yellow then red. Ripe berries are tasty either fresh or cooked for a sauce or jelly.