Ix | “ SEEDS ” 161 
Rachilla hairy. Whole “seed” browner than Avena 
_ flavescens (see p. 158). 
( 
e 
Fig. 70. Aira flexuosa. a, ‘seed,’ nat. size; c and d, the same, 
xabout 7; b, portion of fruiting panicle, showing the flexuous 
rachis; e, the caryopsis, nat. size; f, ditto, xabout 7. Note the 
basal hairs and twisted awn. Nobbe. Cf. Fig. 44. 
An almost worthless grass, on sandy soils, but important as an 
impurity in Avena flavescens (see note, p. 158). 
Aira cespitosa, L. (Fig. 44). 
The -palea, about 2°5mm. long, toothed above, has a 
fine straight hair-like basal awn not longer than itself. 
Caryopsis 13 mm., grooved. Rachilla distimetly hairy. 
Easily distinguished when mixed with Poa 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. Palez not bifid above. 
Agrostis canina. 
A. Spica-venti. 
A. setacea. 
