TRANSPOSONS. “In angiosperms the repeat types (i.e. (retro)transposable elements, (micro)satellite DNA, and truncated derivatives) can be fast evolving in absolute copy numbers and sequence, such that in species from many plant families there are reports of repeat element half-lives of 3–4 million years near complete repeat turnover in the genome over timeframes of 5–10 million years, and repeat copy numbers changing GS two or three fold over just a few million years.” (GS = genome size).
http://www.sciencedirect.com/science/article/pii/S0959437X15001057