Original sentence: Ironically, doing this is actually reversing the evolutionary process in which hellebores' true petals had been modified into nectaries; it is usually these nectaries which become the extra petals in double or anemone-centred flowers.Recent breeding programmes have also created double-flowered and anemone-centred plants
Edited sentence: Ironically, doing this is actually reversing the evolutionary process in which hellebores' true petals had been modified into nectaries; it is usually these nectaries which become the extra petals in double or semi-double flowers.Recent breeding & selection programmes have also created double-flowered & semi-double flowered plants.The flowers of the latter have unfortunately been appointed the awful description of being anemone-centred