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barbed oat, slender oat, slender wild oat, slim oat

animated oat, avoine sterile, sterile oats

Habit Plants annual. Plants annual.

60-80 (150) cm, initially prostrate, usually becoming erect.

30-120 cm, initially prostrate, becoming erect at maturity.


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.

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.


15-35.5 (50) cm long, 6-12 cm wide, erect or nodding.

10-45 cm long, 5-25 cm wide.


21-30 mm, with 2-3 florets;

disarticulation beneath each floret;

disarticulation scars elliptic to triangular.

24-50 mm, with 2-5 florets;

disarticulation beneath the basal floret the florets falling as a unit;

disarticulation scar oval to round-elliptic.


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.

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.


= 28.

= 42.

Avena barbata

Avena sterilis

from FNA
[WildflowerSearch map]
[BONAP county map]
from FNA
[BONAP county map]

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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 24, p. 735. FNA vol. 24, p. 739.
Parent taxa Poaceae > subfam. Pooideae > tribe Poeae > Avena Poaceae > subfam. Pooideae > tribe Poeae > Avena
Sibling taxa
A. fatua, A. hybrida, A. occidentalis, A. sativa, A. sterilis
A. barbata, A. fatua, A. hybrida, A. occidentalis, A. sativa
Name authority Pott ex Link L.
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