44 TRIAND. DIGYN. 



spikelets of about 5 flowers which are longer than the cat., 

 leaves glabrous finely eerrrated, lower ones involute. Lightf. 

 p. 105. E. B. M204. 



HAB. Diy mountain pastures about Blair, Dr. Parsons. Fl. July. 11 . 



Remarkable for its short leaves, finely serrated at the margin, the 

 lower ones being complicate and involute ; and for the racemed spike- 

 lets. Receptacle of the flowers very slightly hairy. 



5. A.Jlavescens (yellow Oat -grass), panicle much branched lax, 

 spikelets of about 3 flowers which are longer than the very 

 unequal valves of the cal., root creeping. Lightf. p. 106. 

 E. B. t. 952. 



HAB. Dry meadows and pastures, Dr. Parsons. Common about 

 Edinb., Mr. Arnott. Fl. July. 2/ . 



The smallest of our Averse, about 1 foot high. Spikelets numerous, 

 small, pale yellow green. Valves of the cal. unequal, ribbed ; one 

 almost subulate. Receptacle of the florets hairy. Outer valve of cor. 

 faintly 5 -nerved, with five very short, acuminated points, and an 

 awn about twice its length : hence the genus Trisetum of Pers. 



27. TRITICUM. 



* Spike distichous. 



1. r Tr.junce?im (Sea rushy Wheat- grass), valves of the cal. 

 obtuse much ribbed with 4 5 awnless flowers, leaves invo- 

 lute pungent, root creeping. Lightf. p. 109. E. B. t. 814. 



HAB. Sea-coast in sandy places, frequent. Bute west coast of Can- 

 tire 3 Oransay and Icolmkill, Lightf. Fl. July. If. . 



Whole plant glaucous, rigid, 1 foot and a half to 3 feet high. Spike 

 long. Spikelets oblong, much compressed, distant, sessile. Cal. 

 valves oblongo-lanceolate, often tridentate. Ext. cor. valves similar, 

 with 5 nerves. 



8. Tr. repens (creeping Wheat-grass, Conch-grass), valves of 

 the cal. much nerved with from 4 8 awned (rarely awnless) 

 flowers, leaves plane, root creeping. Lightf. p. 109. .E. B. 

 t. 909. 



HAB. Fields and waste places eveiy where. Fl. throughout the sum- 

 mer. 11 . 



Height and general aspect of Tr.junceum, but rather more slender, of 

 a glaucous colour only when growing near the sea. Leaves plane, 

 or nearly so. Spikelets smaller, less compressed than in Tr.junc. 

 Cal. and ext. cor. valves 5 -nerved, acute or terminated by an 

 awn of greater or less length. Nerves in the cal. both of this and 

 the former species vary from 5 to 9. Pest of the corn-field, and dif- 

 ficult of extirpation from its long creeping roots. 



3. Tr. canmurn (bearded Wheat- grass], valves awned (mostly 

 3-) nerved with about 5 -awned flowers, leaves plane, root fi- 

 brous. Lightf. p. 108 (Elymus can.). E. B. t. 1327. 



HAB. Woods and hedges occasionally about Glasgow, Hopk. Coast, 

 not rare; between Caroline Park and Crammonrl, Edir.b., Mr.-Gre- 

 vilte. W.July. If.. 



