gentians

noun
  1. 1

    Any of various herbs of the family Gentianaceae found in temperate and mountainous regions with violet or blue flowers.

  2. 2

    The dried roots and rhizome of a European gentian (Gentiana lutea), used as a tonic.

Source: https://en.wiktionary.org/wiki/gentian, https://en.wiktionary.org/wiki/gentians