46 Botanical Section [pti 



Dactylis glomerata (p. 93), 0. P. usually 5-6 mm. long, 

 with curved taper-point ; keel serrated 

 or with bristly hairsabove. (Figs. 88, 89.) 



Kceleria cristata, 0. P. about 4 mm. long, taper- 

 pointed. Inner palea thin and silvery. 

 " Seed" much compressed. (Fig. 120.) 

 2. Keel of O.P. slight. 



Nardus stricta, 0. P. 8-12 mm. long including the 

 tapering awn-point which is rough. 

 No rachilla. (Fig. 131.) 



Molinia cwrulea, O.P. 3-4 mm. long, acutely pointed, 

 often purplish ; the palese usually gape 

 open above ; rachilla frequently kinked, 

 and "knobbed" at top. (Fig. 130.) 



Psamma arenaria, O.P. about 10 mm. long, 5-nerved, 

 the slight keel (central nerve) ending 

 in a short sub-terminal spur. A basal 

 tuft of silky hairs present. (Fig. 147.) 



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

 with a terminal spur-point. (Fig. 93.) 



Arundo Phragmites, O.P. about 11 mm. long, taper- 

 pointed; rachilla covered with long 

 silky hairs (generally goes into Group I). 



Sesleria ccerulea, O.P. about 4 mm. long, 5-nerved, 



the central nerve ending in a short 



awn-point, the other Derves forming 



teeth at the top (p. 131). 



Group III. " Seeds " without awns or awn-like points. The apex 



of the O.P. is either rounded off or 

 simply acute. 

 A. "Seeds" less than imm. in average length. 



1. "Seed" three-sided or triangular in transverse section 

 (owing to prominent keel and marginal 

 ribs of O.P.). Rachilla cylindrical. 



Poa nemoralis (p. 125), O.P. average 2-5 mm. long, 

 with rather acute apex; keel and 

 marginal nerves hairy below. Rachilla 

 microscopically rough. (Fig. 139.) 



