Dahlia spp

Widespread Artemisia, Baccharis, Centaurea, Dahlia spp., (Asteraceae), Citrus sinensis (orange) (Rutaceae)... 

Azfldirachta indica, Soymida febrifuga (Meliaceae) [wood], Haplopappm canescens (Asteraceae) [aerial] glycosides in Vaccinium macrocarpon (Ericaceae), Myrica rubra (Myricaceae) [bark], Primula sinensis (Primulaceae) [petal], Camellia sinensis (Theaceae) [leaf] Widespread Artemisia, Baccharis, Centaurea, Dahlia spp. (Asteraceae), Citrus paradisi, C. sinensis (Rutaceae) [grapefruit juice]... 

Methvlprotocatechuic (Annonaceae), Dahlia spp. dry milk aroma-active... 

Constit. of Dahlia spp. Cryst. (Et20/pet. ether). Mp 110-111°. Gives maleic anhydride adduct, Mp 153-4°. 

Methanolic extracts of Coreopsis spp.. Dahlia spp., and Helichrysum bracteatum containing chalcones and aurones have been tested on silica gel plates with ethyl acetate-formic acid-water (60 12 16) as the mobile phase. The plates are developed to 8.S cm (ca. 40 min), dried, and sprayed with NP/PEG 4000. The clear yellow zones turn to violet and red, and the red-to-orange fluorescent colors seen under longwave UV light confirm the presence of chalcone and aurone pigments. Ammonia vapor intensifies the colors after spraying. 

Chalcones, dihydrochalcones and aurones are not particularly important components of plant food materials, but they occur as notable pigments of flowers of many ornamental plants, such as the common snapdragon Antirrhinum spp., Scrophulariaceae) (Asteraceae), cosmos Cosmos spp.) and dahlia Dahlia spp.) from the Asteraceae family. Chalcones are also pigments of legume seeds (9-99) and woods. Prenylated chalcones are found in hop cones (10-98). 

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