Here are three perennials that are very similar looking (and they are all in the Liliaceae family), especially when they are emerging in the spring.  Perfoliate Bellwort (Uvularia perfoliata) is the first to bloom.  The delicate, pale yellow bloom is deceiving – this is one of the toughest plants I know!  It’s a fun plant to show kids how stems can pierce though the leaves.  I also like Uvularia sessilifolia which blooms later in the season.  Solomon’s seal (Polygonatum biflorum) is better known and is a tough perennial as well.  The arching blue-green stems with dangling bells are very attractive.  The flowers develop into dark blue balls (the fruit) later in the year.  The root structure is very distinctive – small annual growth scars create a rhizome that can look like a string of pearls over time. If you look closely, you can see the tiny pollinator at work on the first bloom of the Solomon's seal.

False solomon’s seal, which is now classified as Maianthemum racemosum, produces flowers on the end of the stem so it is distinctly different from “true” Solomon’s seal in bloom. The pink-reddish berries produced after the flowers are very attractive and persist long into the season.

A perennial that I have recently acquired is the blue flowered “wild” Comfrey (Cynoglossum virginianum).  Note that this is not the same as “common Comfrey” (Symphytum officinale) which is non-native and has pink/purple flowers.  Both are in the Boraginaceae family.  Cynoglossum officinale, another non-native, is a European relative that has reddish/purple flowers that has become a bit weedy in certain areas.  As always, ask for the botanical name when purchasing flowers to ensure you are getting the native version.