Regarding Frequency, the two most frequent species are Parastrephia lucida (Tola) and Distichlis humilis (Brama), each of them being recorded in 61% of the plots, followed by Frankenia triandra (Yaretilla) with 56% and Festuca argentinensis (Chillagua) with 28%.The remaining species, including Adesmia horrida and Senecio viridis, are very rare (Table 6-39).Table 6-39 Frequency (absolute and relative) and density on the salar borde