44 Botanical Section [PT i 



Rachilla bears fine white silky hairs. 

 (Fig. 61.) 



A. flavescens (p. 68), O.P. 5-6 mm. long, 

 yellowish-brown, bifid at apex, with 

 basal hair- tuft. Awn attached to upper 

 part of the back of the O.P. Rachilla 

 long, outstanding, and bearing long silky 

 hairs. " Seeds " very light. (Fig. 58.) 



Arrhenatherum avenaceum (p. 63), "seeds" 

 6-10 mm. long, consisting of two pairs 

 of palese, only the upper pair enclosing 

 a grain. (Fig. 55.) 



Air a caryophyllea (p. 59), O.P. about 1-7 mm. long, 

 dark-brown, bifid at apex, with basal 

 hair- tuft. Awn arising from lower part of 

 0. P. andabouttwice its length. (Fig. 43.) 



A. prcecox. "Seed" very much like A. caryo- 

 phyllea, but the basal hair-tuft is 

 much less developed, and the awn 

 . arises nearer the base of the O.P. 

 (b) Awn straight, and not twisted. 



Agrostis canina, no basal hair- tuft to "seed." 

 (Fig. 36.) 



Calamagrostis Epigeios, basal hair-tuft present 

 exceeding the length of the O.P. (p. 89). 

 D. Awn basal or nearly so. 



1. Awn almost straight. 



Aira ccespitosa (p. 56), "seed" about 2-5 mm. long; 

 awn hairless ; rachilla with long white 

 spreading hairs. (Fig. 40.) 



Aira canescens, awn with tuft of hairs in its 

 middle (p. 58). 



2. Awn bent or distinctly wavy. 



Aira flexuosa (p. 57), O.P. about 5 mm. long, with a 

 conspicuous basal tuft of white silky 

 hairs. (Fig. 41.) 



Agrostis setacea, O.P. about 2 mm. long, with a few 

 basal hairs only (p. 56). 



