Mature leaves of 20 Hieracium L. and 11 Pilosella Hill. species collected from the alpine and subalpine regions of northeast Anatolia (Turkey) were examined for total phenolic content. The highest level was found in leaves of H. conicum (22.5 mg phenol equiv/g dry wt) and the lowest H. cardiophyllum (3.7 mg phenol equiv/g dry wt). Total phenolics content varied significantly (p = 0.05) among species of Hieracium and in decreasing order as follows: H. conicum (22.5) > H. hypoglaucum (21.5) > H. amblylepis (18.1) > H. subsilvularum (17 .2) > H. jurassicum (15.1) >H. tamderense (14.8) > H. mannagettae (14.7) > H. cardiophyllum (3 .7). In Pilosella the level ranged between 5.6 and 25.5 mg phenol equiv/g dry wt, with the lowest in P. grossheimii and the highest in P. hypeuryum. Total phenolics content varied significantly (p = 0.05) among species of Pilosella, in decreasing order: P. hypeuryum (22.5) > P. tephrocephala (17.9) > P. officinarum (15.7) > P. macranthum (13.7) > P. fennica (10.5) > P. macrotricha (7.7) > P. grosheimii (5.6). Within genera, 40% of the Hieracium species and ~64% of the Pilosella species significantly differed in total phenolics content, while ~19.4% of the species significantly differed between genera. The range of differences in total phenolics content in the genera was not wide, clearly due to their taxonomically close relationships between species.
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