Britannica Sources used in this answer

Which flower colours can occur in species of Gentiana?

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Species within the genus Gentiana exhibit a diverse range of flower colours. While they are most characteristically known for their blue or purplish-blue hues—often referred to as "gentian blue"—they can also appear in the following colours:

  • Purple
  • Violet
  • Mauve
  • Yellow
  • White
  • Red

These flowers typically feature petals united into trumpet, funnel, or bell shapes. While many species are prized for their intense blue tones, others, such as Gentiana lutea, are specifically noted for their yellow flowers.12