158 



CLASSIFICATION OF 



[CH. 



t+ Caryopds not more than 3 mm. long. A tuft 

 of hairs on rachilla and hose. 



Avena flavescens. 



Aira jleocuosa, distinguished by its nearly basal awn, harder 

 texture and darker colour of palese, and Bactylis — awnless and with 

 curved long drawn-out apex — are found as impurities in foreign 



Fig. 69. Avena flavescens. c, "seed," nat. size; a and 6, 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 



