I find the Calla Lily to be a most beautiful flower. The name calla lily comes from a Greek word for beauty, quite fitting I would say! But I learned that the Calla Lily isn't truly a lily, nor a calla:

"Calla lilies are not true lilies! Despite what their name suggests, calla lilies are not true lilies. In fact, they are not a calla, either. The calla lily belongs to the genus Zantedeschia and is a member of the Araceae family, along with the caladium and philodendron. It is also known as the pig lily, trumpet lily and arum lily, and begins to blossom in late spring. This flower was first cataloged in the mid 1700s. Why is the name so misleading? Because the Swedish botanist Carolus Linnaeus made a mistake when he was naming the species. Later, the German botanist Karl Koch corrected the error and established the genus Zantedeschia, but the name stuck. The calla lily is native to Southern Africa, and has a remarkable strength – it can continue to grow in water and even survive frost." - http://www.teleflora.com/blog/what-do-calla-lilies-represent/