Four new species are described and discussed: from Bolivia M. (sect. H
abbasia ser. Setosae) huanchacae; from SE Brazil M. (sect. Nabbasia se
r. Pachycarpae) chiliomera and M. (sect. Mimosa) murex; and from Ecuad
or M. (sect. Miimosa subser. Polycarpae) loxensis. The two Brazilian s
pecies are illustrated.