Key to Avena
View taxon page for Avena
(For a list of species in Avena, use the above link.)
Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.
1. Callus glabrous;
florets 
In Poaceae, a single flower and its immediately subtending bracts (lemma and generally palea, the lemma subtending the palea when the latter is present); in a sterile floret, the flower and sometimes palea are rudimentary or absent.
remaining attached at maturity;
lemma 
In Poaceae, the lower, generally larger of two sheathing bracts subtending a flower, generally ensheathing the palea (in a sterile lemma, the associated flower and sometimes palea are rudimentary or absent); with the palea and flower, comprising the floret.
glabrous or nearly so,
awn 
1. Bristle-like appendage or elongation, generally terminal. 2. Stiff, needle-like pappus element in Asteraceae.
of lower
floret generally 0(15) mm
..... A. sativa 1' Callus bearded; florets falling singly or as a unit at maturity; lemma densely
strigose 
With stiff, straight, sharp, appressed hairs.
or soft hairy, especially below, awned
2' Lemma tip ragged or 2-forked, teeth <= 1.5 mm
3. Florets falling separately from
glumes; awn of lowest floret 25–40 mm;
leaf 
Organ arising from a stem, generally composed of a stalk (petiole) and a flat, expanded, green, photosynthetic area (blade); distinguished from a leaflet by the presence in its axil of a bud, branch, thorn, or flower; sometimes with lateral, basal appendages (stipules); either simple (toothed, lobed, or dissected but not divided into leaflets) or compound (divided into leaflets).
margin glabrous
..... A. fatua 3' Florets falling from glumes as a unit; awn of lowest floret 35–90 mm; leaf margin sparsely hairy
..... A. sterilis
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