Pohl, et al. (2016) list 35 species, all included here.(1)
An additional species, A. purata
in the Hodges checklist (#3612.1) was deemed not to occur in North America and excluded. This guide should be used only as a first step in identification; some species can't be confidently separated from photos. The first several species listed here are especially difficult to separate and require additional taxonomic work to refine species limits.
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