WHEAT. 231 



Ear, bearded, compressed, narrower across the face than 

 the 2-rowed profile ; spikclets generally 2-grained ; rachis 

 fragile or tough, narrow, fringed with short hairs. 



Empty glume, long and narrow, the outer face flat; keel 

 prominent from tip to base; apical tooth in Western European 

 forms acute and cin-A^ed as in T. diiruiu ; in the Kussian, 

 Indian and Abyssinian forms short and blunt. 



Grain, flinty, or semi-flinty, 7-9 mm. long, narrow, 

 pointed at both ends , ventral side flat or slightly concave ; 

 cross section more or less triangular. 



Eace III. — Triticum orientale, mihi. Khorasan Wheat 

 Coleoptile , 2-norved . 



Young shoots erect; young leaves narrow, pubescent, 

 bairs of nearly uniform length. 



Straw, of medium height, solid or hollow with thick walls. 



Ear, bearded, very lax, almost square ; rachis tough ; awns 

 scabrid to the base, more or less deciduous. 



Empty glume, long and narrow ; apical tooth blunt. 



Grain, white, very long (10.5-12 mm.), narrow, flintv. 



Race IV. — Triticum durum, Desf. Macaroni Wheat. 

 Coleoptile, 2-nerved. 



Young shoots, erect; young leaves quite glabrous or 

 nearly so. 



Straw, tall, solid or hollow with thick walls. 



Ears, usually bearded, square in section or narrower 

 across the face than the 2-rowed profile; bearded, stiff, usually 

 erect; rachis more or less fragile; the awns of great length, 

 diverging slightly, and almost smooth at the base ; spikelets 

 longer and narrower than those of T. turgidum or T. tmlgare. 



Empty glume, long and narrow, the outer face flattish ; 

 keel curved, prominent from tip to base; apical tooth stout, 

 generally acute and usually curved inwards ; glumes some- 

 what readily detached from the rachis. 



Grain, long and narrow, hard, more or less pointed at 

 both ends, with a prominent dorsal ridge, endosperm flinty; 

 somewhat triangular in section. 



Transitional forms are met with having slightly hairy 

 leaves and approximating towards T. turgidum, T. vulgare, 



