A genus of about 25 or more species, herbs, of North America.
ID notes: This treatment needs considerable additional work in the herbarium, and will likely be substantially modified. Pales are receptacular bracts which subtend all or some of the disc florets of capitulum. They differ from phyllaries in that they subtend individual florets atop the receptacle vs. phyllaries which subtend the entire head of flowers. They are present within some, but not all, Asteraceae genera, and are most common in the Heliantheae tribe.