Noun
Any of several plants of the Americas similar to centaury, and formerly used like it for medicinal purposes, among them:
Centaurium cachanlahuen, the original canchalagua
Centaurium chironioides, a Mexican species
Zeltnera venusta, a California species in the gentian family
Schkuhria pinnata, a plant in the sunflower family native to South America and used medicinally
Source: en.wiktionary.org