“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.
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 )
Goosegrass ( Galium aparine )
Mondo grass or lily turf ( Ophiopogon japonicus ), an Asian ornamentalground 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
Scurvy-grass ( Cochlearia species) in the family Brassicaceae
Scurvy-grass Sorrel ( Oxalis enneaphylla ) in thefamily Oxalidaceae
Seagrasses, including Eel grass ( Zostera spp.)
Sleeping grass ( Mimosa pudica ) a legume (family Fabaceae) and lawn pest
Xyridaceae, known as the yellow-eyed grass family”
And to this list I add monkeygrass (Liriope) and blue-eyed grass (Sisyrinchium albidum).
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