Flavonoid and phenolic acid patterns in seven Hieracium species

The methanolic extracts of Hieracium gymnocephalum, H. suborienii, H. bleci cii, H. coloriscapum, H. guentheri-beckii, H. naegelianum and H. rotundatum were analysed by HPLC and TLC in order to examine their flavonoids and phe nolic acids. With the exception of H. rotundatum, which grows in shaded pla ces, all species exhibit a similar pattern of phenolic substances with chlo rogenic acid, 3,5-dicaffeoylquinic acid and luteolin 7-O-glucoside as the m ain compounds. The chemotaxonomic significance is discussed. (C) 1999 Elsev ier Science Ltd. All rights reserved.