The scarce large blue is a species of butterfly in the family Lycaenidae. It is found in Austria, Slovenia, Croatia, the Czech Republic, France, Georgia, Germany, Hungary, Italy, Japan, Kazakhstan, Mongolia, the Netherlands, Poland, Romania, Russia, northern Serbia, Spain, Switzerland, and Ukraine and East across the Palearctic to Japan. The species was first described by Johann Andreas Benignus Bergsträsser in 1779.

Sanguisorba officinalis, commonly known as great burnet, is a plant in the family Rosaceae, subfamily Rosoideae. It is native throughout the cooler regions of the Northern Hemisphere in Europe, northern Asia, and northern North America.