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Keywords from Image Description:
Elymus trachycaulus ssp trachycaulus as Agropyron trachycaulum HC. en Elymus trachycaulus Link Gould ex Shinners ssp trachycaulus slender wheatgrass labeled Agropyron trachycaulum Link Malte not specified HitchcockChase Collection of Grass Drawings courtesy of the Hunt Institute for Botanical Documentation Carnegie Mellon