Founded in 1783, Curtis's Botanical Magazine is the longest-running botanical periodical with color illustrations of plants (Muggles can subscribe, as it's still in print). William Curtis describes the White Lily, lilium candidum, as "among the very oldest inhabitants of the flower-garden" and praises the flower for its stateliness, beauty, and exceptional powers. These qualities wouldn't have been lost on J.K. Rowling, who gave Harry's mother the same name. Elsewhere in her books, lilies are beloved by slugs, ghosts, and by the heads of Gryffindor and Slytherin: Minerva McGonegall and Severus Snape.