Dogtail Grasses of Mt. Adams Country
The Genus Cynosurus
Bristly Dog's-tail Grass: Cynosurus echinatus - This hasn't been collected in Mount Adams country, but I'd hazard a guess that it is present since it's such an abundant and widely distributed weedy grass.
Crested Dogtail, Crested Dogtail Grass: Cynosurus cristatus -