588 



GRAMINE.E 



2. T. rep ens (Couch-grass). — Root-stock extensively creeping, 

 long, jointed ; stems solitary, ascending, glabrous, i — 2 feet high, 

 hollow; leaves at first involute, afterwards flat, flaccid, with 

 numerous slender ribs each with i row of rough hairs above; 



TRITICUM REPENS {CoUcJl-graSS). 



spikelets ?— 7 -flowered; rachis slender, not brittle; empty glumes 

 acuminate, 5 ribbed ; awns usually short. A very variable, 

 common, and troublesome weed. — Fl. June — August. Perennial. 



3. T. biflorum (Alpine Couch-grass). — A closely allied form, 

 occurring on Ben Lawers, differs in having its pale 3-toothed. 



4. T. pungens (Stiff-leaved Couch). — Densely tufted ; stems 



