HORDED 243 



A. Rachis articulate at maturity; grain entirely- 

 inclosed by the glumes, not falling out when 

 threshed (however it is not grown to the 

 glumes) . 

 B. Spikes loose, almost 4-sided when seen from 

 above; glumes broadly truncate in front, 

 with a very short, obtuse middle tooth, 



obtusely keeled 1. T. sativum 



BB. Spikes very dense, laterally compressed; [spelta Hack, 

 glumes tapering, with an acute middle 



tooth; sharply keeled 2. T. sativum di- 



AA. Rachis not articulated at maturity; grain [coccum Hack, 

 visible between the somewhat open fruiting 



lemma and palea, easily falling out 3. T. sativum 



[tenax Hack. 



The third race, which includes the common wheats, he 



divides in four subraces: 



A. Glumes distinctly keeled only in the upper 

 half, rounded or only shghtly keeled in the 

 lower half. 

 B. Spikes long, more or less loose, somewhat 



dorsally compressed 1. T. sativum 



[vulgare Hack. 



BB. Spikes short, dense, distinctly 4-sided 2. T. sativum 



AA. Glumes sharply keeled at the base. [compactumHack. 



B. Grain short, thick, not compressed, broadly 



truncate above 3. T. sativum tur- 



BB. Grain oblong, narrower, somewhat laterally [gidum Hack. 



compressed, and somewhat acuminate 4. T. sativum 



[durum Hack. 



The first includes most of the common wheats, of 

 which there are numerous varieties. The second includes 

 the club wheats grown in the Palouse country of Wash- 

 ington and the adjacent regions. The third includes 

 English wheat, especially grown in Mediterranean coun- 

 tries. The fourth includes the durum wheat, recently 

 introduced and now successfully grown in the Great 

 Plains region. (See Hackel in Engl. & Prantl, Pflanzen- 

 fam. II. 2:80. 1887. True Grasses, 180. 1890.) 



Kornicke's classification is similar to that of Hackel, 

 but he recognizes the races and subraces as species. 

 (Kornicke, Handb. Getreidebaues, 1:40. 1885 ) 



