Avena sativa L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Much like no. 1 [Avena fatua L.], and hybridizing with it; herbage glabrous to scabrous; spikelets 2(3)-fld, the rachilla glabrous or only sparsely hirsute, not readily disarticulating; lemmas glabrous to sometimes scabrous, 3–7-veined, the callus naked or only sparsely bearded; awns, when present, (15–)22–35 mm, then only on the first lemma, not geniculate; 2n=42. European cultigen derived from no. 1, cult. throughout our range and often adventive in disturbed sites, but probably not persistent.