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Agrostis
http://www.funet.fi/pub/sci/bio/life/plants/magnoliophyta/magnoliophytina/liliopsida/poaceae/agrosti
List of species, synonymy, and common names.
Agrostis hyemalis
http://www.noble.org/imagegallery/grasshtml/WinterBentgrass.html
Images of Winter Bentgrass.
Agrostis hyemalis
http://www.npwrc.usgs.gov/resource/1999/vascplnt/species/ahye.htm
Description, illustration, and range in the Northern Great Plains, USA.
Agrostis hyemalis
http://www.npwrc.usgs.gov/resource/1999/neflor/species/2/agrohyem.htm
Image, description, and range in USA.