Ix] “ SEEDS ” 165 
visible. About 10—14 mm. long and narrowing somewhat 
suddenly into the smooth stitf awn, shorter than itself. 
Indications of a tooth at each side of the base of the awn. 
Caryopsis somewhat flattened, thin and long, barge-shaped, 
8—10 x 15—2mm., pointed at both ends, brown, hairy 
at the tip with the remains of the stigma. “Seed” often 
purplish. Rachilla long and slender. 
Must be carefully distinguished from Brachypodium, which has 
the palea less inrolled and a stouter rachilla. 
Bromus giganteus has a shorter and flatter “seed” and longer 
awn. 
Bromus asper, Murr. (Fig. 71). 
Palea often reddish, 5—7 ribbed and usually roughly 
hairy, mid-rib scaberulous, about 15mm. Jong, linear- 
lanceolate (barge-shaped), the tip more distinctly two- 
toothed and tapering more gradually into the smooth 
awn, about its own leneth. Rachilla distinct. Otherwise 
resembling B. erectus. 
B. giganteus has a shorter “seed” and longer awn. 
AA Palea scarcely hairy: awn up to twice its 
length. 
Bromus sterilis. 
B. giganteus. 
Bromus sterilis, L. (Fig. 50). 
Palea nearly smooth, somewhat inrolled, terete-lanceo- 
late-acuminate, tough, red-brown, 12—15 mm. long, seven- 
ribbed, with a long serrulate awn (20—30 mm. or more) 
practically terminal. Ribs serrate. Caryopsis 9—10 mm. 
long, flattened, thin. Rachilla distinct, smooth, much 
wrapped in, widens upwards and is somewhat flattened. 
