Flower senescence was observed in representatives of 102 genera from 33 monocotyledon families. This is the first comparative study to cover such a wide range of monocotyledons. All of the species studied are of horticultural importance as ornamentals or cut flowers. Observations were made on attached flowers (i.e., still on the plant) on plants growing under cultured conditions, and on detached flowers held in water. Emasculation and style removal was also performed on some of the flowers to prevent pollination occurring. Abscission of unpollinated flowers, and flowers that are persistent regardless of pollination, were both widespread. In contrast, abscission of floral parts (perianth, style, stamens) was much less common, occurring predominantly in the Liliales. This database will form the starting point for more detailed studies of senescence and variation between cultivars.