THE GRASS TRIBE 347 



2. A. Donianum closely resembles the last and A. rcpcns, but 

 differs from both in the flowering glumes, which are bluntly pointed, 

 are densely covered with little asperities, and have a well-marked 

 midrib towards the apex, the 2 lateral ribs ending in teeth. Rocks 

 on Ben Lawers. Fl. August. Perennial. 



3. A. re pens (Quitch, Couch-Grass). Rootstock far-creeping; 

 spikelels 2-3 inches up to 6 inches long, with 8-10 or more spikelets 

 at regular distances on alternate sides ; glumes all similar, narrow, 

 stiff, 5-nerved or more, pointed or ending in an awn which is short 

 or as long as the glume. Fields and waste places ; abundant ; a 

 very troublesome weed. Fl. June. Perennial. (PI. xcvi.) 



4. A. pungens (Stiff leaved Couch-Grass). Differs from A. repens 

 by the leaves, which are more or less rolled inwards along the 

 margins, awl-like and rigid in the upper part, with many thick, 

 slightly rough ribs. Sea-shores. Fl. July. Perennial. 



5. A. junceum (Rush-like or Sand Couch-Grass). Rootstock 

 creeping as in A. repens, which it closely resembles; it is much 

 stiffer and more glaucous ; the leaves are rolled inwards along the 

 margins and are rather sharp at the tips ; spike rather loose ; 

 glumes often obtuse, with 9-1 1 slender, raised ribs. Sandy sea- 

 shores ; common. Fl. July, August. Perennial. 



6. A. acutum (Acute or Decumbent Sea Couch-Grass). Inter- 

 mediate between .1. junceum and A. repens ; stems rather loosely 

 tufted, more or less prostrate at the base ; leaves with the margins 

 rolled inwards, but not so regularly as in A. junceum, the ribs 

 covered all over with minute asperities. Sandy sea-shores ; fre- 

 quent. Fl. July, August. Perennial. 



43. Elymus (Lymc-Grass) 



1. E. arenarius (Sand Lyme-Grass). Stiff, glaucous, 2-4 feet 

 high ; rootstock far-creeping ; leaves stiff, rolled inwards along the 

 margins, sharp-pointed ; spikes 3-4 or sometimes 8-9 inches long ; 

 spikelets in rather distant pairs ; glumes stiff, the outer ones about 

 I inch long, very sharp-pointed. Sandy seashores, especially in the 

 north. Fl. July. Perennial. 



44. Hordeum (Barley) 



1. H. sylvaticum (Wood-Barley). Erect, about 2 feet high 

 leaves flat, usually hairy on the sheaths ; spike cylindrical, not very 

 dense, about 3 inches long ; flozcers of the 2 lateral spikelets perfect, 

 of the central one male or rudimentary or none. Woods on chalky 

 soil ; rare. Fl. July, August. Perennial. 



2 A 



