6. A. hirtula Lag. = A. strigosa Schreb. ssp. hirtula 
(Lag.) Malz. A wild oat which is restricted to the west- 
ern portion of the Iberian Peninsula (Mordvinkina, 
1986). According to Thellung(1911)and Mal’tsev(1929), 
A. hirtula is intermediate in its characters between A. 
Wiestu and A. barbata. Mal’tsev derives the remaining 
diploid and tetraploid oats from this species. 
7. A. strigosa Schreb.=A. strigosa Schreb. ssp. 
strigosa (Schreb.) Thell. The hairy or sand oat occurs as 
a weed throughout northwestern Kurope from Portugal 
to southern Finland (Vavilov, 1926; Werth, 1944). Thel- 
lung reports it as sometimes cultivated on sandy soils in 
Portugal and Spain, western and central France, Belgium, 
northwestern Germany and Great Britain. Vavilov says 
it is only met with as a crop in France and Great Britain. 
In England it is rare and local, being found only as a 
weed in grain fields (Clapham et al., 1952), while Stan- 
ton (1986) reports that an improved strain has been de- 
veloped in Wales. A. strigosa has two variants which 
are sometimes called species and sometimes proles (races). 
These are A. brevis and A. nudibrevis. 
A. brevis Roth=ssp. strigosa prol. brevis (Roth) Haus- 
skn. The short oat, like the typical stvigosa, is adapted 
to unfavorable soil conditions and is sometimes cultivated 
in Portugal, Spain, France and northwestern Germany 
(Thellung, 1911). It is distinguished by its blunt lemmas 
which end in two teeth rather than in two awns. 
A .nudibrevis Vav. =ssp. strigosa prol. nuda (L.) Haus- 
skn. = A. nuda L. var. biaristata Asch. & Gr. The small- 
grained naked oat is occasionally cultivated in northwest- 
ern Germany (Vavilov, 1926). 4. nudibrevis differs from 
the typical strigosa in having lemmas which do not be- 
come indurated at maturity, but remain membranous 
allowing the loosely enclosed grains to be readily threshed 
[ 272 ] 
