Zeltnera

Zeltnera is a genus of flowering plants in the gentian family. It was erected in 2004 when the genus Centaurium (the centauries) was split. Genetic analysis revealed that Centaurium was polyphyletic, made up of plants that could be grouped into four clades. Each became a genus. Centaurium remained, but it is now limited to the Eurasian species. The Mexican species now belong to genus Gyrandra, and the Mediterranean and Australian plants are in genus Schenkia. The new name Zeltnera was given to this genus, which contains most of the North American centauries. There are about 25 species.

Plants of this genus are annual, biennial, or short-lived perennial herbs. They are taprooted or have fibrous root systems. They produce one or more branching stems which are often ridged and sometimes winged. The leaves are gathered around the lower stem or arranged along the length of the stem. They vary in shape, from linear to lance-shaped to oval, and are green or yellowish. The inflorescence is variable in arrangement. The flower has a tubular throat that opens into a flat corolla with four or five lobes. It may be any shade of pink or white, and the throat is usually paler, to white or yellowish, or occasionally patterned with green. The fruit is a small capsule containing up to 700 minute seeds. Zeltnera and Centaurium species differ mostly in the morphology of the style and stigma, as well as the shape of the fruit capsule.