158 CLASSIFICATION OF [ CH. 
tt Caryopsis not more than 3mm. long. A tuft 
of hairs on rachilla and base. 
Avena flavescens. 
Aira flexuosa, distinguished by its nearly basal awn, harder 
texture and darker colour of palez, and Dactylis—awnless and with 
curved long drawn-out apex—are found as impurities in foreign 
“seed.” 
Fig. 69. Avena flavescens. c, ‘‘ seed,’ nat. size; a and b, ditto, x about 
7. The dorsal twisted and kneed awn is very characteristic. Note 
also the hairy rachilla. The palea is bifid above—not visible in the 
lateral view. Nobbe. 
Avena flavescens, L. (Fig. 69). 
Yellow. Palea about 5 mm. long, five-ribbed, bifid 
at the apex into two long slender teeth, closely investing 
the brownish caryopsis, and with a sub-dorsal awn 10 mm. 
long with little or no twist, and hairy at the base. 
Rachilla flattened and with white hairs. Caryopsis not 
