A reinvestigation of the root extract of Achillea ageratifolia led to the identification of nine new alkamides. Their structures and stereochemistries were elucidated by spectroscopic methods. Apart from the pyrrolidides and dehydropyrrolidides previously published for that species four further pyrrolidides together with five pyrrolides were isolated. The latter derivatives fall into a new series of alkamides. The different patterns of unsaturation of the acid residues suggest close biogenetic connections with oleic and crepenynic acid.