The Centaurys: The Genus Centaurium - Flowers rose to pink in color.
Dane's Dwarf Gentian, Little Gentian, Slender Gentian: Comastoma tenellum (Synonyms: Gentiana tenella, Gentianella tenella, Gentianella tenella ssp. tenella)
The Gentians: The Genus Gentiana - Corolla funnel-shaped and typically over 2 cm long, the petals united and the lobes shorter than the tube. Plants are typically large perennials.
The Gentians: The Genus Gentianella - Corolla funnel-shaped and typically less than 2 cm long, the petals united and the lobes shorter than the tube.Plants are typically smaller annuals.
Oneflower Fringed Gentian, One-flowered Gentian, Fringed Gentian: Gentianopsis simplex (Synonyms: Gentiana simplex, Gentianella simplex) -
The Swertia: The Genus Swertia - Corolla not funnel-shaped and the petals barely if at all united into a tube. Plants are small to large perennials.
The Centaurys: The Genus Zeltnera -