Die Verbreitung der Blausäure bei den Cormophyten. 14. Mitteilung1. Neue Beobachtungen zur Cyanogenese bei den Compositen2

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Abstract
Prunasin was isolated from leaves of several taxa belonging to the Achillea millefolium aggregate (Anthemideae), and from leaves of Centaurea aspera L., Centaurea pullata L., Centaurea son-chifolia L. (Cardueae), Gerbera jamesonii and Leibnitzia anandria (Mutisieae). Akenes of Xeranthemum cylindraceum (Cardueae) contain mainly xylose and glucose containing oligosides of m-Hydfoxymandelonitrile and akenes of Anthemis altissima, Anthemis cairica (Anthemideae) and of Chardinia orientalis (Cardueae) contain oligosides of mandelonitrile. Leaves of Aster ptarmicoides (Astereae) yielded zierin. Dimorphotheca pluvialis (Calenduleae) contains linamarin and lotaustralin in equal amounts. The cyanogenetic glycosides of Compositae (= Asteraceae) are discussed briefly from a taxonomic point of view. Storage of cyanogenic compounds in akenes mainly or in leaves mainly may represent two different responses of composites to ecological stresses.

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