The herbaceous perennial plant Gentiana calycosa is a species of gentian known by the common names Rainier pleated gentian and mountain bog gentian. It is native to the mid-elevation mountains of the western United States and Canada.
Gentiana calycosa plants are creepers, mostly rising just a few inches above the ground but they can grow up to one foot. The flower of Gentiana calycosa is a funnel-shaped cup opening into a five-petaled face 3 to 5 centimeters (1.2 to 2.0 in) wide, in shades of deep blue to purple. The plant has hardy, thick green leaves on the thin red stems from which the flowers are borne. Like other gentians, G. calycosa is an attractive mountain wildflower good for use in alpine gardens. The genus honors King Gentius of Illyria, ruler of an ancient country on the east side of the Adriatic Sea, who is reputed to have discovered medicinal virtues in gentian plants.
