Eight Easter cactus (Rhipsalidopsis Britt. & Rose) cultivars and five Holiday cactus (Schlumbergera Lem.) cultivars were used to study postanthesis floral development and individual flower longevity. Floral aging was characterized by desiccation of the perianth and ovary, and was generally followed by abscission of the entire flower from the phylloclade. Petal turgor was maximal during early development when petal color was most intense. Petal color became less intense in the later stages of development. Flower longevity ranged from 7 to 12 days and from 4 to 6 days for the Rhipsalidopsis and Schlumbergera, respectively. This study demonstrates that significant genetic variation occurs within Rhipsalidopsis and Schlumbergera for flower longevity.