individually on the underside of the leaves of the host plants: Potentilla erecta, Potentilla crantzii and Potentilla aurea. The wintering was observed in Switzerland as a caterpillar in the penultimate stage. Other observations show that after an egg rest of eleven days, the caterpillars hatch, only eat plants for a few days and then prepare for wintering. Observations from the Rätikon and Silvretta areas in Austria show a two-year development cycle with the first wintering in the first larval stage and a second wintering in the last larval or pupal stage. Imagos can be found every year due to a partial third hibernation. Conservation According to the current state of knowledge, the species is not endangered in the Alps, as the occurrence of Pyrgus cacaliae is mostly outside of agricultural areas or on extensively grazed mountain pastures. Etymology "Cacalia, in German Roßlattich". "Roßlattich" is now mostly regarded as one of many German names for Tussilago farfara. Originally, Adenostyles alpina [= Cacalia alpina, Tussilago cacalia] was very probably meant here. As with most Pyrgus species, it has nothing to do with the food of the caterpillar. References External links Barcodes of life European Butterflies Lepiforum.de Pyrgus Butterflies described in 1839 Butterflies of Europe