IXj 



SEEDS 



161 



Kachilla hairy. Whole "«eed" browner than Avena 

 flavescena (see p. 158). 



Fig. 70. Aira flexnosa. a, "seed," nat. size; c aud d, the same, 

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

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

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



An almost worthless grass, en sandy soils, but important as an 

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



Aira ccespitosa, L. (Fig. 44). 



The palea, about 2*5 mm. 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 Foa nemoralis, &c. — e.g. 

 by the awn, hairs on rachilla, &c. 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. Palea; not bifid above. 

 Agi'ostis canina. 

 A. Spica-venti. 

 A. setacea. 



w. 11 



