Avena sativa

L.
Common names: Oats Cultivated oats Naked oats Avoine Avoine cultivée
Synonyms: Avena fatua var. sativa
Treatment appears in FNA Volume 24. Treatment on page 737.
Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché

Copyright: Utah State University

Plants annual. Culms 35-180 cm, prostrate to erect when young, becoming erect at maturity. Sheaths smooth or scabridulous; ligules 2-8 mm, truncate to acute; blades 8-45 cm long, 3-14 (25) mm wide, scabridulous. Panicles (6) 15-40 cm long, 5-15 cm wide, nodding. Spikelets (18) 25-32 mm, to 50 mm in naked oats, with 1-2 florets (to 7 in naked oats); disarticulation not occurring, the florets remaining attached even when mature. Glumes subequal, (18) 20-32 mm, 9-11-veined; calluses glabrous; lemmas 14-18 mm, usually indurate, membranous in naked oats, usually glabrous, sometimes sparsely strigose, apices erose to dentate, longest teeth 0.2-0.5 mm, usually unawned, sometimes awned, awns 15-30 mm, arising in the middle 1/3, weakly twisted, not or only weakly geniculate; lodicules with a lobe or tooth on the wings, this sometimes very small; anthers (1.7) 3-4.3 mm. 2n = 42.

Distribution

Conn., N.J., N.Y., Wash., Va., W.Va., Mich., D.C., Wis., Ariz., N.Mex., Pacific Islands (Hawaii), Mass., Maine, N.H., R.I., Vt., Fla., Wyo., Tex., La., N.Dak., Nebr., Tenn., N.C., S.C., Pa., Alta., B.C., Greenland, Man., N.B., Nfld. and Labr. (Labr.), N.S., N.W.T., Ont., P.E.I., Que., Sask., Yukon, Calif., Nev., Puerto Rico, Colo., Md., Alaska, Ala., Ark., Ill., Ga., Ind., Iowa, Okla., Idaho, Mont., Oreg., Ohio, Utah, Mo., Minn., Kans., Miss., Ky., S.Dak.

Discussion

Avena sativa, a native of Eurasia, is widely cultivated in cool, temperate regions of the world, including North America. Fall-sown oats are planted in the Pacific and southern states in the United States; spring-sown oats are more important elsewhere in North America. It is sometimes planted as a fast-growing soil stabilizer along roadsides. Several forms are grown, of which the most distinctive are 'naked oats'. These differ from typical forms as indicated in the description, and in having caryopses that fall from the florets. Escapes from cultivation are common but rarely persist.

Avena sativa hybridizes readily with A. fatua, forming hybrids with the fatua-type. lodicule. The hybrids are easily confused with fatuoid forms of A. sativa, which differ in having the sativa-type lodicule.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Avena sativa"
membranous +  and scarious +
1.7 cm17 mm <br />0.017 m <br /> (?) +
0.3 cm3 mm <br />0.003 m <br /> (0.43 cm4.3 mm <br />0.0043 m <br />) +
erose +  and dentate +
awned +, biaristate +, dentate +  and bifid +
Bernard R. Baum +
1 (?) +  and 3 (?) +
straight +
geniculate +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
8 cm80 mm <br />0.08 m <br /> (45 cm450 mm <br />0.45 m <br />) +
not evident +
scabridulous +
cross +, linear +  and narrowly lanceolate +
3mm;14mm +
spikelike +
rounded +  and pointed +
Oats +, Cultivated oats +, Naked oats +, Avoine +  and Avoine cultivée +
not branching +
erect +  and prostrate +
35 cm350 mm <br />0.35 m <br /> (180 cm1,800 mm <br />1.8 m <br />) +
not woody +
Conn. +, N.J. +, N.Y. +, Wash. +, Va. +, W.Va. +, Mich. +, D.C. +, Wis. +, Ariz. +, N.Mex. +, Pacific Islands (Hawaii) +, Mass. +, Maine +, N.H. +, R.I. +, Vt. +, Fla. +, Wyo. +, Tex. +, La. +, N.Dak. +, Nebr. +, Tenn. +, N.C. +, S.C. +, Pa. +, Alta. +, B.C. +, Greenland +, Man. +, N.B. +, Nfld. and Labr. (Labr.) +, N.S. +, N.W.T. +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Calif. +, Nev. +, Puerto Rico +, Colo. +, Md. +, Alaska +, Ala. +, Ark. +, Ill. +, Ga. +, Ind. +, Iowa +, Okla. +, Idaho +, Mont. +, Oreg. +, Ohio +, Utah +, Mo. +, Minn. +, Kans. +, Miss. +, Ky. +  and S.Dak. +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
1 +  and 2 +
sterile +  and bisexual +
compressed +
reduced +
shorter or longer +
subtending +
subequal +
2 cm20 mm <br />0.02 m <br /> (3.2 cm32 mm <br />0.032 m <br />) +
membranous +
uncinate +
strigose +  and glabrous +
lanceolate +  and ovate +
1.4 cm14 mm <br />0.014 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
membranous +  and indurate +
truncate +  and acute +
0.2 cm2 mm <br />0.002 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 +
15cm +  and 40cm +
spikelike +
5 cm50 mm <br />0.05 m <br /> (15 cm150 mm <br />0.15 m <br />) +
dry +  and fleshy +
not disarticulating +
not prolonged +
scabridulous +  and smooth +
15 +  and 50 +
compressed +
0 cm0 mm <br />0 m <br /> (5 cm50 mm <br />0.05 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Avena fatua var. sativa +
Avena sativa +
species +
membranous +
parallel +  and converging +
stoloniferous +  and rhizomatous +
aquatic +  and terrestrial +