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Gentiana lutea L. subsp. aurantiaca M. Lainz is an endangered plant endemic of the northwest of the Iberian Peninsula. This subspecies is characterized by the colour of its flowers, ranging from orange to almost red. Like G. lutea, its roots have been collected for its high content in bitter compounds in order to be used mainly in the elaboration of bitter spirits and in medicine. HPLC chromatography...
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