Avena sterilis

L.
Common names: Animated oats Avoine sterile
Treatment appears in FNA Volume 24. Treatment on page 739.
Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché

Copyright: Utah State University

Plants annual. Culms 30-120 cm, initially prostrate, becoming erect at maturity. Sheaths glabrous or hairy; ligules 3-8 mm, acute to truncate-mucronate; blades 8-60 cm long, 4-18 mm wide, scabridulous, often ciliolate on the margins. Panicles 10-45 cm long, 5-25 cm wide. Spikelets 24-50 mm, with 2-5 florets; disarticulation beneath the basal floret the florets falling as a unit; disarticulation scar oval to round-elliptic. Glumes subequal, 20-50 mm, 9-11-veined; calluses bearded, hairs to 1/5 the length of the lemmas; lemmas 17-40 mm, usually densely strigose below midlength, sometimes sparsely strigose, glabrous or scabridulous, apices bidentate to bisubulate teeth 1-1.5 mm, awns 30-90 mm, arising in the middle 1/3; lodicules without a lobe on the wing; anthers 2.5-4 mm. 2n = 42.

Distribution

Ont., Que., Calif., N.J., Pa., Oreg.

Discussion

Avena sterilis is native from the Mediterranean region to Afghanistan; it now grows on all continents. It has become naturalized in California, where it can be found in fields, vineyards, orchards, and on hillsides. It has been reported from Oregon, but no specimens could be found to substantiate the report. Dore & McNeill (1980) also report it from Ottawa and Guelph, Ontario. It is listed as a noxious weed by the U. S. Department of Agriculture.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Avena sterilis"
membranous +  and scarious +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
awned +, biaristate +, dentate +  and bifid +
Bernard R. Baum +
1 (?) +  and 3 (?) +
straight +
once-geniculate +
3 cm30 mm <br />0.03 m <br /> (9 cm90 mm <br />0.09 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
8 cm80 mm <br />0.08 m <br /> (60 cm600 mm <br />0.6 m <br />) +
not evident +
scabridulous +
cross +, linear +  and narrowly lanceolate +
4mm;18mm +
spikelike +
rounded +  and pointed +
Animated oats +  and Avoine sterile +
not branching +
30 cm300 mm <br />0.3 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +
not woody +
Ont. +, Que. +, Calif. +, N.J. +, Pa. +  and Oreg. +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
2 +  and 5 +
sterile +  and bisexual +
compressed +
reduced +
shorter or longer +
subtending +
subequal +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
membranous +
0 +  and 1/5 +
uncinate +
glabrous +  and strigose +
scabridulous +
lanceolate +  and ovate +
1.7 cm17 mm <br />0.017 m <br /> (4 cm40 mm <br />0.04 m <br />) +
acute +  and truncate-mucronate +
0.3 cm3 mm <br />0.003 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
membranous +
inconspicuous +
not toothed +  and toothed +
concealed +  and prominent +
2 +  and 1 +
entire +  and bifid +
well-developed +
2-keeled +
10cm +  and 45cm +
spikelike +
5 cm50 mm <br />0.05 m <br /> (25 cm250 mm <br />0.25 m <br />) +
dry +  and fleshy +
not disarticulating +
not prolonged +
oval +  and round-elliptic +
hairy +  and glabrous +
15 +  and 50 +
compressed +
2.4 cm24 mm <br />0.024 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Avena sterilis +
species +
membranous +
0.1 cm1 mm <br />0.001 m <br /> (0.15 cm1.5 mm <br />0.0015 m <br />) +
parallel +  and converging +
stoloniferous +  and rhizomatous +
aquatic +  and terrestrial +