Common Centaury, European Centaury: Centaurium erythraea (Synonyms: Centaurium minus, Centaurium umbellatum, Erythraea centaurium) - Flowers commonly with 5 corolla lobes, the corollas often pink in color.
Desert Centaury, Great Basin Centaury, Tall Centaury, Western Centaury: Zeltnera exaltata (Synonyms: Centaurium exaltatum, Centaurium namophilum var. nevadense, Centaurium nuttallii, Cicendia exaltata) - Flowers commonly with 4 corolla lobes, the corollas often creamy in color.
Monterey Centaury, Muhlenberg's Centaury: Zeltnera muehlenbergii (Synonyms: Centaurium curvistamineum, Centaurium floribundum, Centaurium muhlenbergii) - Flowers 5 merous.