Analysis of the petrol-diethyl ether extracts of Pterocaulon balansae and P. lanatum aerial parts afforded, besides puberulin, scopoletin- [2',3'-dihydroxy-3'-methylbutyl-( 1 ')]ether, scopoletin- [2',3'-epoxy-3'-methylbutyl-(1 ')I ether and 7-(3-methyl-2,3-epoxybutyloxy)-5,6-methylenedioxycoumarin, four new related coumarins. The isolation of these coumarins may constitute a valid index for the chemotaxonomic characterization of genus.