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. 
x2x12, hardly grooved. Awn about 30mm. 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 Hordewm-grain are the closely 
adherent paleze 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 paleze hairy. 
Palea inrolled, terete-lanceolate-acuminate, or 
linear-lanceolate (barge-shaped). Apical teeth 
minute and pointed. 
11—2 
