232 CHAPTER XIV 



and T. dicocciim, and one or two hybrids are known differing 

 only from typical T. durum in having beardless ears. 



Race V. — Triticum polonicum, L. Polish Wheat. Cole- 

 optile 2-nerved. 



Young shoots, erect, young leaves blue-green, glabrous 

 or nearly so. 



Strawy tall, solid or hollow with thick walls. 



Ear, bearded; spikelets large, usually 1- (or 2) grained; 

 rachis somewhat fragile. 



Empty glume, as long as or longer than the rest of the 

 spikelet, narrow 3-4 cm. long, keeled, with two small apical 

 teeth. 



Grain, very long (11-12 m.m.), narrow, flinty, somewhat 

 triangular in section. 



Race VI. — Triticum turgidum, L. Rivet or Cone Wheat. 

 Coleoptile 2-nerved. 



Young shoots, erect or prostrate ; young leaves clothed 

 with soft hairs of nearly uniform length. 



Straw, tall, solid, or hollow with thick walls. 



Ear, usually bearded, square in section or narrower across 

 the face than the 2-rowed profile ; bearded, heavy, often pen- 

 dulous, and less rigid than T. durum; rachis tough; awns 

 stout, very scabrid from tip to base, frequently deciduous; 

 spikelets about as long as broad, often ripening 3-4 grains. 



Empty glume, short and broad the outer face convex, 

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

 acute and curved ; glumes more firmly attached to rachis than 

 in T. durum. 



Grain, generally mealy, though sometimes flinty or semi- 

 flinty; large plump and somewhat short, with truncate apex 

 and high dorsal hump behind embryo. 



Race VII. — Triticum pyramidale, mihi. Egyptian Cone 

 Wheat. Coleoptile, 2-nerved. 



Young shoots, erect; young leaves pubescent, hairs some- 

 what short ; culm leaves yellowish-green. 



Straw, very short, solid or hollow with thick walls. 



Ear, bearded, dense, short, usually tapered towards the 

 apex and oblong in section, wider across the 2-rowed side 

 than across the face ; rachis tough ; awns scabrid to the base 

 and sometimes deciduous. 



Empty glume, keeled to the base. 



