Arrhenatherum elatius Arrhenatherum elatius , with the common names false oat-grass , tall oat-grass , tall meadow oat , onion couch and tuber oat-grass , is a perennial species of grass , native to Europe , western Asia, and northern Africa. This bunchgrass is often used as an ornamental grass . It is native to Europe but can be found elsewhere as an introduced species . It is found especially in prairies, at the side of roads and in uncultivated fields. The bulbous subspecies can be a weed of arable land . It is palatable grass for livestock and is used both as forage and fodder .Description This coarse grass can grow to tall. The leaves are bright green , broad, slightly hairy, and rough. The ligule is long and smooth edged. The panicle is up to , and the bunched spikelets have projecting and angled awns up to long, green or purplish. The panicles often remain into winter . The spikelets are oblong or gaping. It flowers from June to September. The roots are yellow . Two subspecies have been described: Arrhenatherum elatius subsp. elatius , the more common variety. Arrhenatherum elatius subsp. bulbosum , onion couch or tuber oat-grass, distinguished by the presence of corms at the base of the stem, by which it propagates. It occurs in vegetated shingle and arable land.Habitat Arrhenatherum elatius is a principal species in two UK National Vegetation Classification habitat communities: the very widespread MG1 and the much rarer MG2 . This means that it can be found with species such as Dactylis glomerata , and Filipendula ulmaria . It is found on road verges , along hedges and riverbanks. It can colonise and stabilise limestone scree , bare calcareous cliffs, maritime shingle and coastal dunes .
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