The structure of 110 samples of herbaceous grasslands is classified as belonging to 7 types (defined in a previous article; see table I). A comparison of various statistical analyses is made to validate this typology using 20 parameters for vegetational structure (table II). A comparison between 3 principal component analyses shows that the grouping of 110 samples into 7 types permits at least 50% of the basic information to be retained. Two cluster analyses, the first based on 110 samples, and the other on the average data for the 7 types, gave rather similar results (fig 1a and 1b). A classificatory discriminant analysis shows that by using the 20 vegetational structure parameters, 72.5% of the samples can be correctly assigned to the 7 types (table III). Analysis of variance for the 20 parameters tested shows that in 80% the hypothesis of equality of the 7 types is not valid (P= 95%). The pastoral value and composition of the biological spectrum (importance of the perennial species versus the annual species) are highly differentiated from one another. All these elements can provide an argument in favour of the validity of our typology. The main significant variables in the structure of the vegetation of the 7 types are described (table V, fig 2a and 2b). Hypotheses regarding the evolution of the grasslands as a result of different modes of management are discussed in order to determine a more optimal use of these areas.