The corollas of the ray are distinctly bilabiate, but anthers and style differ so much from all the labiatiflorous genera grouped together in the Tribe Mutisieae that the authors of the Genera Plantarum have judged best to join our genus with the Tribe Asteroideae, in which, if the shape of the corolla be disregarded, it finds a proper place next to Grindelia among the Homochromeae.
Source: wiktionary