1) Grass 2) Wheat-grass 
Wheatgrass is a food prepared from the cotyledons of the common wheat plant, Triticum aestivum (subspecies of the family Poaceae). It is sold either as a juice or powder concentrate. Wheatgrass differs from wheat malt in that it is served freeze-dried or fresh, while wheat malt is convectively dried. Wheatgrass is allowed to grow longer than malt....
(genus Agropyron), any of a number of species of wheatlike grasses in the family Poaceae, found throughout the North Temperate Zone. The plants are ... [1 related articles]
[n] - a grass of the genus Agropyron
wheat-grass noun a grass of the genus Agropyron