Paris quadrifolia

Paris quadrifolia, the herb Paris or true lover's knot, is a species of flowering plant in the family Melanthiaceae. It occurs in temperate and cool areas throughout Eurasia, from Spain to Yakutia, and from Iceland to Mongolia. It prefers calcareous soils and lives in damp and shady places, especially old established woods and stream banks.

P. quadrifolia is in decline in Europe due to loss of habitat. In Iceland, for example, it is on the red list.