Grasses

Poales 
Grasses
Sedges

Plants
Ontario Field Naturalist's Toolchest
Poales: Grasses, Sedges and Rushes
Grasses: An Identification Guide
Grasses: An Identification Guide GB
The recommended guide to break into identifying grasses and allies.  Good coverage of grasses, less so of sedges and rushes and non-polales lookalikes.  This is an updated version.

Links for grasses, sedges, rushes and other poales
Ontario Grasses On grasses, sedges and rushes.
Introduction to Grasses, Sedges and Rushes PDF

Grasses

Field Guide to Wisconsin Grasses Grasses of Ontario How to Identify Grasses and Grass-like Plants Grasses of the NortheastGrasses and Rushes of Maine

Field Guide to Wisconsin Grasses GB
Grasses of Ontario GB PDF
Out of print but useful for its range maps.
How to Identify Grasses and Grass-like Plants Review Am
Also recommended.  Mostly an illustrated glossary.
Grasses of the Northeast: A Manual of the Grasses of New England and Adjacent New York Am
Sedges and Rushes of Maine Am
Quite good I hear, but hard to get into Canada (high shipping costs)
Manual of Grasses for North America GB
Field Guide to Grasses of the Mid-Atlantic






Field Guide to Grasses of the Mid-Atlantic Pub

Links for grasses...
Grasses in North America A detailed guide to the grasses of North America north of Mexico.  Includes range maps, illustrations, images and other information.  Incomplete and illustrations are small.
Tallgrass Ontario Resources on a rare habitat in Ontario.
Poaceae A key to grasses
Grasses from Flora of North America Volume 24
Grasses from Flora of North America Volume 25

Sedges
Sedges of the Northern Forest Sedges and Rushes of Minnesota Sedges of Maine Field Guide to Wisconsin SedgesSedges of Indiana
Sedges of the Northern Forest Pub Cornell Am
Fantastic photographic guide.  Also available as a foldout chart and as a digital atlas.  Note that the digtial atlas is free.
Sedges and Rushes of Minnesota Pub Am
Outstanding comprehensive guide.
Sedges of Maine Am
Likely as good as Sedges and Rushes of Minnesota but expensive shipping..
Field Guide to Wisconsin Sedges GB
Has some useful info on habitat.  Limited to common carex species.
Sedges of Indiana Am
Limited to non-carex speecies.

Consortium of Midwest Herbaria
 
Consortium of Northeastern Herbaria
Sedges from eFloras (Flora of North America), Volume 23
Sedges from Flora of North America, Volume 23