160 THE SEEDS OF THE GRASSES. 



Seeds angular. 



Grain rounded at both ends. Poa trivialis. 

 Grain pointed. Poa alpina. 



Seed awned. 



Grain without a groove. 



Seed, the chestnut brown spikelet less the glumes. 



Anthoxanthum odoratum. 

 Awn bent; grain with traces of stigma; spikelet silvery 



grey. Alopecurus pratensis. 

 Awn long, smooth, and stiff ; grain purple, with traces of 



stigma. Bromus erectus. 

 Awn smooth ; grain reddish. Bromus asper. 

 Awn rising between two teeth ; rachilla bent. Bromus 



mollis. 

 Awn twisted closely with pale spiral band. Arrhcnatherum 



avenacenm. 



Grain with a groove. 



Grain broader at apex than at base. 

 Rachilla smooth. 



Grain light grey. Festuca duriuscula. 

 Grain greyish brown. Festuca rubra. 

 Rachilla downy. 



Grain dark grey. Festuca heterophylla. 



Grain not broader at apex than at base. 



Awn kneed; rachilla flat, with white hairs. Avena 



flavescens. 

 Awn curved ; grain hairy at apex. Holcus lanatus. 

 Awn straight; grain white; rachilla hairy. Air a 



ccespiiosa. 

 Awn twisted loosely ; grain dark ; rachilla hairy. Air a 



flexuosa. 

 Awn hairy and long ; rachilla smooth and stout. Brachy- 



podium sylvaticum. 

 Awn serrulate ; rachilla serrulate. Hordeum murinum. 



