“…It grows on rocky and clayey slopes, rocks, walls, and other dry places of plains and mountains up to 2000 m (Quezel & Santa, 1962;Tutin et al, 1993;Fennane et al, 1999;Rhizopoulou & Psaras, 2003;Ozenda, 2004;Mishra et al, 2009). In addition, the caper plant has a large ecological amplitude and withstands the extreme environmental conditions (drought, poor and degraded soil, and steep slopes), because of its structural and physiological adaptations to drought, such as developing a very powerful root system, and increasing the density of photosynthetic cells and the production of primary metabolites (Rhizopoulou & Psaras, 2003;Benseghir-Boukhari & Seridi, 2007;Sakcali et al, 2008;Mishra et al 2009;D.F.P., 2011;Libiad et al, 2011;Liu et al, 2011;Gull et al, 2015;Chedraoui et al, 2017).…”