Why are lilies called both Calla and Arum?

Lilies are often referred to as Calla and Arum due to their classification within the family Araceae. The term "Calla" typically refers to the genus Calla, which includes the well-known Calla lily, while "Arum" is a broader term that encompasses various genera within the same family, including Arum itself. Both names reflect the plant's distinctive flower shape and characteristics, contributing to its popularity in gardens and floral arrangements.