We say of the oak, ‘How grand of girth!’
Of the willow we say, ‘How slender!’
And yet to the soft grass clothing the earth
How slight is the praise we render.
Edgar Fawcett (1847-1904), The Grass
At its most basic level, Grasses belong to the GRAMINAEA or Grass family and Sedges belong to the Cyperus family CYPERACEAE.
