IX] 



" SEEDS " 



167 



flattened in the antero-posterior plane, and usually shines through 

 the closely investing palea. A rachilla is visible. In Brachypodium 

 the caryopsis is less flattened, and the apex tapers into the awn 



Fig. 73. Bromus arvensis, var. 

 mollis, a, "seed," nat. size; 

 b and c, the same, x 3. d, 

 caryopsis, x about 3. The awn 

 originates between two teeth 

 of the strongly ribbed palea. 

 Coracle-shaped type. Nobbe. 



Fig. 74. Bromus arvensis, var. 

 secalinus. a, spikelet, 6 and 

 c, "seed," nat. size; d and e, 

 the same, x 6. Nobbe. Cf. 

 Fig. 73. 



without teeth. In Loliiim and Agropyrum the caryopsis is still 

 more wheat-like and grooved. 



All our Bromes are weeds, but some of them are important 

 advilterants, requiring careful examination. 



B. inermis is cultivated, and is a valuable grass. Awn short or 

 wanting. Palese strongly 5 — 7 ribbed, inner with a marked central 

 rib, closely adhering to caryopsis. 



B. Schraderi is also said to be valuable. 



tt Caryopsis not thin and flattened, corn-like, 

 3-5 — 5 mm. Palea smooth, inflated, boat-like. 

 Lolium temulentv/m. 



