Passionflowers are particularly striking because, like daffodils, they have a special floral structure called the corona. The corona in the daffodil is the trumpet-like structure and the corona in this passionflower is the circle of purple filaments. As to the origin of the genus name of Passiflora, it is named for the Passion of Jesus Christ, not for the passion of romantic love.
Katherine Wagner-Reiss has her botany Certificate from the New York Botanical Garden, where she is a volunteer tour guide. She has a special interest in native plants and in the scientific and the common names of plants.