BARLEY 125 



117. Atterberg's group classification. In recent years 

 a system of classification of barleys in detail within the 

 subspecies has been devised by Atterberg (1889), and 

 afterwards improved upon by Neergaard (1889, pp. 54- 

 61), and perfected by Bolin (1893), which is very useful 

 in the identification of varieties. It permits a division 

 of each subspecies into four types based upon certain 

 botanical characters as follows : - 



I. Kernels with long-haired rachillse (basal bristles) 

 and lodicules and without teeth on the lateral nerves. 



II. Kernels with long-haired rachillae and lodicules 

 and with teeth on the lateral nerves. 



III. Kernels with short-haired more or less woolly 

 rachillse, and lodicules and without teeth on the lateral 

 nerves. 



IV. Kernels with short-haired more or less woolly 

 rachillse and lodicules, and with teeth on the lateral 

 nerves (see Newman, 1912, pp. 133-136). 



As this system was worked out and is used extensively 

 at the plant breeding station of Svalof, Sweden, it is 

 known as the " Svalof System." 



118. Erect six-row barley ( Hordeum hexasticlum, Linn.) . 

 All spikelets in this subspecies are fertile and awned. 



They are arranged in six distinct rows standing out from 

 the rachis, as easily seen by viewing the spike endwise. 

 Because of shortness of the internodes the spikelets stand 

 erect, and are much compacted. From many actual 

 measurements it is found that common nodding six-row 

 barley averages from 25 to 30 internodes to the deci- 

 meter, while in the erect six-row barley the average is 

 over 40. In the erect six-row barleys the side spikelets 

 are separated from the middle spikelets by an angle of 

 over 60 degrees, while in the common nodding six-row, 



