Avena L.
Lemmas with red or brown or white hairs near the base
Terminal teeth of the lemmas acute, c. 1 mm long. Spikelets mostly 3-flowered. Hairs on the lemmas brown or white
Rhachilla continuous and tough between the florets which do not separate at maturity
Abscission scar at the base of the lemmas elongated. Glumes mostly 3–5 cm long. Lowest lemma 2.5–4 mm long. Otherwise similar to A. fatua. Introd. from Europe Avena sterilis
Abscission scar at the base of the lemmas circular. Glumes mostly 2–3 cm long. Otherwise similar to A. fatua. Introd. from Europe. Avena ludoviciana