Eupithecia undata is a moth in the family Geometridae first described by Christian Friedrich Freyer in 1840. The North American Moth Photographers Group lists it as a synonym of Eupithecia lafontaineata. It is found in the Pyrenees, Alps, the Massif Central, the Tatra mountains, on the Balkan Peninsula and in Romania.[1] It is also found in North America, where it has been recorded from Wyoming, Montana, Idaho, Colorado, Nevada and Oregon.[2]
The wingspan is 17–18 mm.[3] Adults have been recorded on wing from mid-May to July in Europe.
The larvae feed on Silene and Minuartia species and Gypsophila repens. Larvae can be found from the end of June to mid-August. The species overwinters in the pupal stage.[4]