Publication: Linnaea 10: 302. 1836.
Notes: Known from single locality in Okanogan County.
H&C: "Reports of its occurrence in Wash. appear to have been based upon material which I believe to be referable to A. idahoensis. There is a strong possibility that this is the same as A. mertensii Trin. (Linnaea 10:302. 1836)".
FNA24: "Agrostis mertensii grows on banks and gravel bars in river and lake valleys, and on open grasslands and rocky slopes of mountains and cliffs. It has a circumboreal distribution. In the Flora region, it extends from Alaska across Canada to Newfoundland and Greenland, south in the mountains to Wyoming and Colorado in the west, and West Virginia, Tennessee, and North Carolina in the east. It also grows in arctic Europe, Scandinavia, the mountainous regions of Mexico, and n