The Nature Sanctuary "Palmar El Salto", is home to the third largest Jubaea chilensis (Molina) Baillon (Chilean palm) population in the country. The ojective of this study is to contribute ti the knowledge of the flora found in the sanctuary and, to achieve this, thirty vegetation census were carried out with the phylosociologic method of the Zurich-Montpellier school. The flora consists of 234 speces. Conformed by 92 species, the endemic element is dominant in the flora. The most important species in the plam grove are: Nassella chilensis (Trin.) E. Desv., Chusquea cumingii Nees, Retanil'a trinervia (Gi;;ies et Hook.) Hook. et Arn. and Jubaea chilensis, all native. Stands out the presence of nine species with conservation problems, most of them vulnerable to extinction.