﻿OF THE SPECIES. 



Genera. Species. 



( Twice the width of the outer palea considerably 



J more than the length of the palea Bromus secalinus. 



| Twice the width of the outer palea equal to the 



I length of the palea Bromus arvensis. 



J Awns of the florets much longer than the calyx. 5. 

 Awns of the florets much shorter than the calyx. 6. 



ISpikelets drooping. Awns longer than the flo- 

 rets Bromus sterilis. 

 Spikelets erect. Awns equal in length to the 

 florets Bromus diandrus. 



f Lower floret about one-third longer than the 

 small glume Bromus erectus. 

 I Lower floret twice the length of the small 

 I glume Bromus asper. 



\ Radical leaves hairy 1. 



Trisetum. L ,. ,. L . . _ . 



( Radical leaves not hairy Trisetum pratcnse. 



, \ Ligule long and acute Trisetum pubescens. 



( Ligule very short and obtuse Trisetum flavescens. 



Festuca. \ Awns much longer than the florets. Festuca bromoides. 



( Awns much shorter than the florets. 1. 



1 { Root fibrous. Stem under the panicle rough....Festuca ovina. 



( Root creeping. Stem under the panicle smooth.Festuca duriuscula. 



j Spikelets long, on short footstalks Triticum sylvaticum. 



Triticum. J Spikelets short without footstalks 1. 



, ( Stem rough Triticum cristatum. 



\ Stem smooth 2. 



I Awns [rather longer than the florets Triticum caninum. 



( Awns very short or wanting 3. 



( Rachis rough Triticum repens. 



( Rachis smooth Triticum junceum. 



Elymus. Elymus arenarius. 



c Florets awned. Glume longer than the spikelet. Lolium temulentum. 

 Lolium. j Florets not awned. Glume shorter than the 



' spikelet Lolium perenne. 



XXI 



Plate. 

 49 

 49 



50 

 50 



51 



51 



52 



53 

 54 



54 



61 



61 



62 

 6."> 



64 

 64 



