Difference between revisions of "Avena barbata"

Pott ex Link
Common names: Slender oats Slender wild oats
Treatment appears in FNA Volume 24. Treatment on page 735.
FNA>Volume Importer
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Revision as of 02:15, 27 July 2019

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.