1) Genus arrhenatherum 2) Oat grass 3) Plant genus 
Oatgrasses are very common perennials with yellowish roots. The shining stems grow to a height of 1.5 meters, but die off in winter. The leaves are hairless with blunt ligules. The inflorescence is a panicle with two-flowered bisexual spikelets. ...
(from the article `oat grass`) any of the perennial plants of two genera of grasses, Arrhenatherum and Danthonia (family Poaceae). Approximately six species of tall grasses, ...
Arrhenatherum is a genus of oat-like grasses, of which Arrhenatherum elatius, sometimes called French rye-grass, is a valuable fodder plant.
[n] - oat grass
genus Arrhenatherum noun oat grass