6 7 



NOTES ON GROUP XL 



1. Annual species. Harden, in murinum, and Lolium 



temulentum. These are recognised as annuals, 

 by pulling plants, and teasing asunder the 

 leaves of the component shoots. All the shoots 

 are fertile, therefore the plants are annuals. See 

 page 48. 



2. Hordeum maritimum, With. This is practically a 



sea-side variety of Hordeum murinum, with nar- 

 rower, thicker, and firmer blades. 



3. Sea-side allies of Triticum repens. Triticum 



junceum, L. (Sand couch). The blades are 

 thicker and firmer. With the thickening of the 

 blade, the ribs become more prominent. 



4. Distinction between Hordeum sylvaticum and 



Bromus asper. These wood species are most 

 readily distinguished by examining the inter- 

 spaces between the veins of the apex of the 

 sheath. This is done by holding the sheath up 

 to the light, and observing the veins under a 

 lens. 



I i 



Hordeum sylvaticum. \ Brotmis asper. 



Width of inter- 

 space . * 



As broad as the vein. | Two or threee times 

 ! as broad as the vein. 



