Although tropical invaders have been recorded in the northernmost sectors of the Mediterranean [e.g., [385], [386]-RSB-, tropicalization is especially obvious in the southern sectors, where species of tropical origin now form a significant portion of the biota. (journals.plos.org)
As plant species spread from their nutrient - rich tropical origins, however, the root tips of plants such as the desert shrub species Tamarix ramosissima (left of largest cross section) evolved to be thinner so they could more efficiently explore soil for nutrients, and they have less dependence on symbiotic fungi. (sciencedaily.com)
Like the other species of the family, it is of tropical origin; and being a perennial, and of a shrubby character, will not succeed in open culture at the North. (fieryfoodscentral.com)