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From aerial parts of five plants lots of Parthenium hysterophorus-P. glomeratum collected along 72 km in Salta Province, Argentina, seven known and four new pseudoguaianolides have been found. p-Methoxybenzoic acid was also isolated from plants growing 2500 m above sea level. The taxonomic situation of both species is discussed.
A population of Parthenium hysterophorus collected in Salta Argentina afforded two ambrosanolides, 2β-hydroxycoronopilin and 1α,2β,4β-trihydroxypseudoguaian-6β,12-olide, as well as five known others. Plants of the fructification from those transplanted from the Puna Argentina at 1200 m over the sea level produced hymenin.
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