The fifth cardenolide, having [α]D -43 ± 5 ° (c 0.4; methanol) was, apparently, a new cardiac glycoside. Its structure is being established. Erycordin was also detected chromatographically. A feature of rockery erysimum is that neither erysimoside nor erysimin is the main glycoside, as in the majority of Erysimum species. In rockery erysimum, bipindogulomethyloside predominates, and in this respect it is closer to the genus Cheiranthus than to Erysimum. The synonym of rockery erysimum, Cheiranthus pulchellus Willd, is apparently not fortuitous.