There are about 150 species of perennials and shrubs in the genus Lysimachia.
Never plant it where it borders a lawn; it will escape into the grass and be impossible to get rid of!
These so-called thugs are plants that cover the ground so fast that if left to their own devices they eventually crowd out every other plant in a bed.
As well as wonderful quotations, C. L. Fornari's handy book contains a lot of useful advice.
If you wish to attract many butterflies to your garden, plant a butterfly Bush, “Buddleia Davidii,” in your garden.