Erigeron L. is a genus of more than 200 annual, biennial and perennial species native to North and Central America and some 390 species world wide (Nesom, 2006 FNA). Erigeron is the largest genus or only genus in substribe Conyzinae depending upon how many segregate generate are recognized. The genus is variable in leaf, habit and involucre appearance. Fleabanes of often confused with asters, especially in alpine habitats. Nesom (1989, 1990, 1994) and Nesom and Noyes (1999) recognized 21 sections in the New World portion of the genus. A few examples are shown below.