shrubs which grow in arid and semi-arid regions are also xeromorphic. for example, "caragana korshinskii, artemisia sphaerocephala," and "hedysarum scoparium" are shrubs potent in the semi-arid regions of the northwest china desert. these psammophile shrubs are not only edible to grazing animals in the area, they also play a vital role in the stabilisation of desert sand dunes.