Two new diterpenes, closely related to scopadulcic acids and scoparic acids, have been isolated from Scoparia dulcis. The structure and stereochemistry of the compounds were determined by spectroscopic techniques. Four new diterpene compounds have been isolated from the aerial parts of Calceolaria latifolia, and their structures elucidated by spectroscopic methods. Two of them present a pimaradiene type skeleton and the other two, a stemarane skeleton.