Shannon M. Murphy and Paul Feeny. 2006. Chemical facilitation of a naturally occurring host shift by Papilio machaon butterflies (Papilionidae). Ecological Monographs 76:399–414.

Appendix F. A figure showing HPLC chromatograms (monitored at 254 nm) for the polar fractions (F1, F2, F3) of the Papilio machaon aliaska ancestral host plant (Cnidium cnidiifolium), the P. m. aliaska novel host plants (Artemisia arctica and Petasites frigidus), the P. oregonius host (A. dracunculus) and a non-host plant (A. frigida).

FIG. F1. HPLC chromatograms (monitored at 254 nm) for the polar fractions (F1, F2, F3) of the Papilio machaon aliaska ancestral host plant (Cnidium cnidiifolium), the P. m. aliaska novel host plants (Artemisia arctica and Petasites frigidus), the P. oregonius host (A. dracunculus) and a non-host plant (A. frigida). Equivalent amounts of each host plant were injected for each analysis; peak height represents the amount of compound(s) present in 0.2 gle of host plant extract.