In popular language grass means a short, green, ground covering or lawn, usually, but not necessarily comprised of a "true grass" or grasses, called turf. See also pasture, grass (material).
In botany, grass refers to plants of the family Poaceae. These are the true grasses.
Plants that are not true grasses include:
China grass or remie or rhea (Boehmeria nivea), a nettle grown for bast fibres, in the family Urticaceae
Ditch grass or Wigeon grass (Ruppia maritima) in the family Ruppiaceae
Fish grass (Cabomba caroliniana)
Mondo grass or lily turf (Ophiopogon japonicus), an Asian ornamental ground cover
Nutgrass, a common lawn pest (Cyperus rotundus) in the family Cyperaceae
Pepper grasses (Lipidium spp.) in the family Brassicaceae
Sawgrass, abundant in sub-tropical marshlands (Cladium spp.) in the family Cyperaceae
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