Wikipedia
Avenula
Avenula is a genus of Eurasian plants in the grass family. Over 100 names have been proposed for species, subspecies, varieties, and other infraspecific taxa within Avenula, but only one species is accepted. The others names are all regarded as synonyms of other accepted names. The only recognized species in the genus is Avenula pubescens, native to Europe and Asia from Iceland and Portugal to Xinjiang, Mongolia, and Siberia. It is also naturalized in scattered locations in North America.
Other genera containing species once included in Avenula: Helictochloa, Helictotrichon and Tricholemma.