Agrostis rossiae is a rare species, originally known only from alkaline soils near hot springs in Yellowstone National Park, Wyoming. Tercek et al. (2003) showed that somewhat morphologically similar plants of A. scabra found around hot springs in Yellowstone and Lassen Volcanic national parks, and of A. pauzhetica Prob. found around hot springs on the Kamchatka Peninsula, Russia, are closely related to A. rossiae. They recommended, however, that the three be treated as separate species until more information has been obtained.