Chase Crowell

1 Introduction Shrub willows (Salix) are woody perennials with ornamental, riparian, and bioenergy applications. Consisting of over 350 species, the genus Salix can be found throughout temperate to arctic northern latitudes and grown on marginal land (Dickmann and Kuzovkina 2014; Smart et al. 2005; Stoof et al. 2014).