ix] 



" SEEDS " 



161 



Rachilla hairy. Whole " seed " browner than Avena 

 flavescens (see p. 158). 



Fig. 70. Aira fiexuosa. u, "seed," nat. size; c and d, the same, 

 X about 7; 6, portion of fruiting panicle, showing the flexuous 

 raohis ; e, the caryopsis, nat. size ; /, ditto, x about 7. Note the 

 basal hairs and twisted awn. Nobbe. Cf. Pig. 44. 



An almost worthless grass, on sandy soils, but important as a,n 

 impurity in Avena flavescens (see note, p. 158). 



Aira ccespitosd, L. (Fig. 44). 



The palea, about 2o itim. long, toothed above, has a 

 fine straight hair-like basal awn not longer than itself. 

 Caryopsis 1'3 mm., grooved. Rachilla distinctly hairy. 



Easily distinguished when mixed with Poa nemoralis, &c. — e.g. 

 by the awn, hairs on rachilla, &o. It requires scrutiny in regard to 

 Agrostis, which also has no awn or basal hairs. 



** No basal tuft, or merely a few short microscopic 

 hairs below. Palese not bifid above. 

 Agrostis canina. 

 A. Spica-venti. 

 A. setacea. 



W. 11 



