Two examples of a small tree/shrub have appeared in my garden. I've tried to identify it, with no success, I wonder if you known what it is? The plants are now two to three feet tall and woody. Its ...

Non-random distribution of genotypes in plant populations gives rise to the development of spatial-genetic structure (SGS) at a variety of scales (Silvertown, 2001; Vekemans and Hardy, 2004).