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Genus Centaurium
- genus of low-growing herbs mostly of northern hemisphere having flowers with protruding spirally twisted anthers
Genus Eustoma
- small genus of herbs of warm regions of southern North America to northern South America
Genus Exacum
- genus of tropical Asiatic and African plants: especially Persian violets
Genus Frasera
- genus of North American herbs: columbo; includes some species sometimes placed in genus Swertia
Genus Gentiana
- type genus of the Gentianaceae; cosmopolitan genus of herbs nearly cosmopolitan in cool temperate regions; in some classifications includes genera Gentianopsis and Gentianella
Genus Gentianella
- genus of herbs with flowers that resemble gentian; in some classifications included in genus Gentiana
Genus Gentianopsis
- genus of fringed gentians; in some classifications included in genus Gentiana
Genus Halenia
- genus of herbs of Eurasia and the Americas: spurred gentians
Genus Sabbatia
- genus of smooth slender North American herbs with showy flowers
Genus Swertia
- genus of herbs of mountains of North America and Eurasia and Africa