Avena barbata

Pott ex Link
Common names: Slender oats Slender wild oats
Treatment appears in FNA Volume 24. Treatment on page 735.
Please click on the illustration for a higher resolution version.
Illustrator: Cindy Roché

Copyright: Utah State University

Plants annual. Culms 60-80 (150) cm, initially prostrate, usually becoming erect. Sheaths of the basal leaves pilose, upper sheaths usually glabrous; ligules 1-6 mm, obtuse; blades 6-30 cm long, 2-20 mm wide, glabrous or pilose. Panicles 15-35.5 (50) cm long, 6-12 cm wide, erect or nodding. Spikelets 21-30 mm, with 2-3 florets; disarticulation beneath each floret; disarticulation scars elliptic to triangular. Glumes subequal, 15-30 mm, 7-9-veined; calluses bearded, hairs 2-3 mm; lemmas 15-26 mm, densely strigose below midlength, apices acute, biaristate, 2 veins extending 2-4 mm beyond the apices, awns 30-45 mm, arising about midlength, geniculate; lodicules narrowly triangular, without lobes on the wings; anthers 2.5-4 mm. 2n = 28.

Distribution

Mass., N.Mex., Wash., Calif., Mont., Pacific Islands (Hawaii), Ariz., Oreg., Nev.

Discussion

Avena barbata is native to the Mediterranean region and central Asia. It has become naturalized in western North America, particularly California, displacing native grasses. It was collected once in Vancouver, British Columbia, but should be considered a waif there.

Selected References

None.

Lower Taxa

None.

"decumbent" is not a number.

... more about "Avena barbata"
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 +
Pott ex Link +
1 (?) +  and 3 (?) +
straight +
midlength +
geniculate +
3 cm30 mm <br />0.03 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
keeled +  and rounded +
pseudopetiolate +  and branching +
intravaginal +, extravaginal +, branching +  and basal +
swelling +
6 cm60 mm <br />0.06 m <br /> (30 cm300 mm <br />0.3 m <br />) +
not evident +
pilose +  and glabrous +
cross +, linear +  and narrowly lanceolate +
2mm;20mm +
spikelike +
rounded +  and pointed +
Slender oats +  and Slender wild oats +
not branching +
60 cm600 mm <br />0.6 m <br /> (80 cm800 mm <br />0.8 m <br />) +
not woody +
Mass. +, N.Mex. +, Wash. +, Calif. +, Mont. +, Pacific Islands (Hawaii) +, Ariz. +, Oreg. +  and Nev. +
1/4 +  and 1/3 +
liquid +, soft +  and hard +
capillary +
pistillate +  and staminate +
sometimes longer +
2 +  and 3 +
sterile +  and bisexual +
compressed +
reduced +
shorter or longer +
subtending +
subequal +
1.5 cm15 mm <br />0.015 m <br /> (3 cm30 mm <br />0.03 m <br />) +
membranous +
uncinate +
0.2 cm2 mm <br />0.002 m <br /> (0.3 cm3 mm <br />0.003 m <br />) +
lanceolate +  and ovate +
1.5 cm15 mm <br />0.015 m <br /> (2.6 cm26 mm <br />0.026 m <br />) +
0.1 cm1 mm <br />0.001 m <br /> (0.6 cm6 mm <br />0.006 m <br />) +
membranous +
inconspicuous +
triangular +
concealed +  and prominent +
2 +  and 1 +
entire +  and bifid +
well-developed +
2-keeled +
15cm +  and 35.5cm +
nodding +  and erect +
spikelike +
6 cm60 mm <br />0.06 m <br /> (12 cm120 mm <br />0.12 m <br />) +
dry +  and fleshy +
not disarticulating +
not prolonged +
elliptic +  and triangular +
15 +  and 50 +
compressed +
2.1 cm21 mm <br />0.021 m <br /> (3 cm30 mm <br />0.03 m <br />) +
1 (?) +  and 3 (?) +
simple +  and compound +
2 (?) +  and 3 (?) +
Gramineae +
Avena barbata +
species +
membranous +
parallel +  and converging +
stoloniferous +  and rhizomatous +
aquatic +  and terrestrial +