Fourteen perennials from western U.S.A. mainly in the mountains. They are tufted to clump-forming with mainly basal leaves and comparatively large, generally yellow daisy flowerheads.
Potentially showy plants for the rock garden, seemingly requiring an ordinary well drained soil and a sunny site, but difficult to get beyond the seedling stage. It has been suggested that the genus is semi-parasitic on roots of associated plants though there appears to be no evidence for this. Here is a challenge for would-be growers. Seed sown in spring germinates freely, the problems start soon afterwards.