Botrychium lunaria has a circumpolar distribution in the northern hemisphere. Coming from New England, I think of it as a rare and hard to find species. To my delight, it was extremely abundant around Schynige Platte in the Swiss Alps. Once we spotted one plant we began to notice them everywhere.
For further details on the habitat and distribution of B. lunaria see Art Gilman’s extensive conservation and research plan prepared for The New England Wildflower Society http://www.newfs.org/docs/pdf/Botrychiumlunaria.PDF