Cyclophora pendulinaria, the sweetfern geometer moth or pearly-grey wave, is a moth in the family Geometridae. It is found in North America, where it is found from Newfoundland and Labrador west to the Yukon and coastal British Columbia, south to Georgia in the east. The habitat consists of moist or mesic forests. The wingspan is 17–26 mm. The wings vary from white to gray or even blackish-brown. Adults have been recorded on wing from April to October.