ch. vi] Key to Grass "Seeds" 45 



Group II. "Seeds" with the 0. P. either taper-pointed, or 



bearing an awn-point or spur, but not 

 distinctly awned. (See p. 38.) 



A. O.P. without a distinct keel; "seed" round-backed, narrowing 



below and tapering above. 

 Cynosurus cristatus (p. 90), O.P. 3-4 mm. long, with a 



coarsely scabrid curved point. Colour 



varies from light yellow to brown. 



(Fig. 86.) 

 G. echinatus, O.P. 5-6 mm. long without including 



the awn-point, of a pale straw colour ; 



usually has a distinct awn. 

 Festuca ovina var. vulgaris, O.P. 3-4 mm. long, or up 



to 4-5 mm. with the terminal awn-point. 



Rachilla round and outstanding. 



(Fig. 102. See p. 101.) 

 F. ovina tenuifolia, O.P. 2-4 mm. long, acutely 



pointed, but without an awn-point. 



(Fig. 103.) 

 F. rubra var. genuina, O.P. 4-5 mm. long, usually with 



a very short awn-point; often with a 



pinkish tinge. (Fig. 107. See p. 102.) 

 F. elatior sub-sp. arundinacea (p. 99), O.P. 6-9 mm. long, 



tapering to an acute point, or even 



with an awn-point. (Fig. 95.) 

 Agropyrum repens, O.P. 7-12 mm. long including the 



taper-point, or terminal awn-point. 



(Fig. 29.) 

 Elymus arenarius, may have the keel of its O.P. 



very slight and come here (see 



p. 46). 



B. O.P. with a distinct keel; "seed" either compressed, or at 



least triangular in central transverse 

 section. 

 1. Keel of O.P. very marked. 



Bromus Schraderi, 0. P. 14-22 mm. long, taper- 

 pointed ; grain about 7 mm. long. 

 (Fig. 83, p. 88.) 



