IX] " SEEDS " 163 



Hordeum, murinum, L. 



Lower palea 9 — 10 mm. long, five-ribbed, lanceolate 



and wrapped round and adhering to the fruit (grain), 



upper palea also ribbed. The grain about 7 — 8 mm. 



X 2 X 1'2, hardly grooved. Awn about 30 mm. long, 



serrulate. Rachilla slightly serrulate. 



** Awn not twice the length of the grain. 



Hordeum pratense. 

 H. maritimum. 



Hordeum pratense, Huds. 



Spikelet with a reddish tinge ; awn almost smooth, 

 less than 20 mm. long: not twice the length of the 

 smooth and obscurely nerved grain. 



Hordeum maritimum. With., similar to H. pratense, 

 but softer and the awn somewhat longer. 



The principal features of the Hordeuin-gr&in are the closely 

 adherent palese and angular fruit, the stiff awn appearing to come 

 off from it as in Barley. The rachilla remains. 



They are all weeds of no use in agriculture, though H. pratense 

 is not uncommon in good pastures. 



(2) Palea investing the caryopsis, often closely, 



but not fused with it, and its tip and awn 



quite free. 



* Awn not strictly terminal but sub-terminal, 



or arising from between two teeth or in a 



sinus at the apex of the palea. 



t Caryopsis thin, flattened and usually 6 — 10 mm. 

 long, and the palese hairy. 



= Palea inrolled, terete-lanceolate-acuminate, or 

 linear-lanceolate (barge-shaped). Apical teeth 

 minute and pointed. 



11—2 



