True lover's knot

''Paris quadrifolia'', the herb-paris or true lover's knot, is a Eurasian species of flowering plant in the family Melanthiaceae, although authorities formerly regarded it as part of the Liliaceae family. It is related to ''Trillium'', with which it can be confused. ''Trillium'', however, is generally 3-merous, whereas ''Paris quadrifolia'' is 4-merous.