This allows mutations that would be lethal in diploid populations to accumulate in polyploids. However silencing of redundant genes occurs rapidly in new polyploids through genetic and epigenetic means. It is believed that at least half plants are or have been polyploids. Aquatic plants, especially the Monocotyledons, include a large number of polyploids. It is not clear whether polyploids of "B. holboellii" (as narrowly defined) exist. Autopolyploids are polyploids with multiple chromosome sets derived from a single taxon. Plants are generally more capable of surviving, and indeed flourishing, as polyploids.