Phalaris species - Canary-grasses
These are distinctive grass. They are commonly spread from bird food.
Phalaris canariensis - Canary-grass
Phalaris minor - Lesser Canary-grass
This is an uncommon grass, the panicle is longer and more slender, but the clearest difference is that the edges of the glumes are erose, that is finely irregular.
Phalaris arundinacea - Reed Canary-grass
This is a common grass of river-sides and wet meadows. There is a comparison of the common large reed-like grasses here.