Ornamental garden grasses are wide ranging with many cultivars. It is always best to try and obtain with the proper botanical cultivar name.
However, even with the proper name, it is not always possible to get what you are really after because of the wide variations resulting from growing grasses from see (The easy way). A good supplier will have stock that is true from selected plants.
Life and gardening is not always simple, so to help, we give a list of the most-used common names. Again, common names vary from area to area, so always best to try and actually see the stock that you want, growing as mature plants.
This preamble about common names is not meant to be pessimistic, or denigrate growers. there are many good grass growers who specialise. Unfortunately - as with many things gardening - there are also others!
Bent - Agrostis
Black Grass - Ophiopogon planiscapus
Blue Fescue - Festuca glauca
Blue Oat Grass - Helictotrichon
Blue Sedge - Carex
Bush Grass - Calamagrostis
Chinese Plume Grass - Miscanthus
Corkscrew Rush - Juncus effusus 'Spiralis'
Dwarf Fountain Grass - Pennisetum
Elijah's Blue Fescue - Festuca glauca Elijah Blue
Fountain Grass - Pennisetum
Golden Dew Grass - Deschampsia cespitoa Goldtau
Korean Feather Reed Grass - Stipa brachytricha
Maiden Grass - Miscanthus
Pampas Grass - Cortaderia
Panic Grass - Panicum
Tufted Hair Grass - Deschampsia cespitosa
Japanese Silver Grass - Miscanthus
Whispering Grass -
Red Baron - Imperata cylindrica
Sedge - Carex
Squirrel Tail Grass - Hordeum
Golden Oats - Giant Oat - Stipa gigantea
Blue Grass - Elymus hispidus