ch. vi] Key to Grass "Seeds" 49 



B. "Seeds" 4 mm. or more in average length. 



1. Grain tightly held between the palece. 



Lolium perenne (p. 113), O.P. 5-8 mm. long, usually 

 with rounded apex. Rachilla com- 

 pressed. (Fig. 123.) 



Festuca pratensis (p. 100), O.P. 5-6 mm. long, rachilla 

 cylindrical. (Fig. 97.) 



Bromus inermis, O.P. 9-12 mm. long, rachilla cylin- 

 drical and hairy. (Fig. 82, p. 87.) 



Glyceria fluitans, O.P. 4-5 mm. long, 7-nerved, the 

 nerves rough; rachilla much enlarged 

 at top. (Fig. 112.) 

 [In the following species the O.P. is usually either taper- 

 pointed or bears an awn-like point, 

 but occasionally their seeds may appear 

 to come here (see Group II). 



Festuca rubra (Fig. 107), the O.P. is 4-5 mm. long, 

 including the awn-point. 



F. elatior sub-sp. arundinacea (Fig. 95), O.P. 6-9 mm. 

 long, usually tapering to an acute point. 



Bromus Schmderi, O.P. 14-22 mm. long, taper- 

 pointed. (Fig. 83.) 



Arundo Phragmites, O.P. 10-12 mm. long, taper- 

 pointed (p. 66). 



Psamma arenaria, O.P. 9-11 mm. long, bearing a 

 very short sub-terminal spur. 



Elymus arenarius, O.P. 12-17 mm. long, hairy, and 

 with a terminal spur. (Fig. 93.)] 



2. O.P. very broad and loose, allowing the grain to separate 



Melica nutans, O.P. 4-6 mm. long ; grain about 

 2-5 mm. long, shining, of a dark- 

 brown colour. (Fig. 126.) 



M. uniflora, "seed" very similar to M. nutans. 

 (N.B. "Seeds" of the last two species are not often met 

 with.) 



