Avena fatua

Avena fatua L., Sp. Pl. 80 1753. (Syn: Anelytrum avenaceum Hack.; Avena ambigua Schoenb. [Invalid]; Avena cultiformis (Malzev) Malzev; Avena fatua var. acidophila Kiec …………………………………..; Avena hybrida Peterm.; Avena intermedia Lindgr. [Illegitimate]; Avena intermedia T. Lestib.; Avena japonica Steud.; Avena lanuginosa Gilib.; Avena meridionalis (Malzev) Roshev.; Avena nigra Wallr.; Avena occidentalis Durieu; Avena patens St.-Lag. [Illegitimate]; Avena pilosa Scop. [Illegitimate]; Avena sativa subsp. fatua (L.) Fiori …; Avena septentrionalis Malzev; Avena sterilis Delile ex Boiss. [Invalid]; Avena vilis Wallr.);

Avena fatua is a species of grass in the oat genus. It is known as the common wild oat.

This oat is native to Eurasia but it has been introduced to most of the other temperate regions of the world. It is naturalized in some areas and considered a noxious weed in others.

It is a typical oat in appearance, a green grass with hollow, erect stems 1 to 4 feet tall bearing nodding panicles of spikelets. The long dark green leaves are up to a centimeter wide and rough due to small hairs. The seedlings are also hairy.

This and other wild oats can become troublesome in prairie agriculture when it invades and lowers the quality of a field crop, or competes for resources with the crop plants. It takes very few wild oat plants to cause a significant reduction in the yield of a wheat or cultivated oat field, even though the seeds are a type of oat. (taken from Wikipedia on 10.4.13)