Plantago lanceolata
"Plantago lanceolata" contains phenylethanoids such as acteoside (verbascoside), cistanoside F, lavandulifolioside, plantamajoside and isoacteoside. It also contains the iridoid glycosides aucubin and catalpol. These iridoid glycosides make the plant inedible to some herbivores, but others are unperturbed by them--for example, the buckeye butterfly "Junonia coenia", whose larvae eat the leaves of "P. lanceolata" and ingest the iridoid glycosides to make themselves unpalatable to predators.