203 



Triticum. 



Winter, and spring habit in wheat. 



Thick-hollow, thin- solid, angular, circular, bristly, and smooth stems. 



Rough, smooth, broad and narrow leaves. 



Beardless, bearded, compact, and dense ears. 



Feited, smooth, keeled, rounded, large, and small glumes. 



Red, white, and grey chaff. 



Red, white, long-narrow, and short-round grains. 

 Hard-translucent, soft-opaque endosperms. 

 Strong, and weak quality of flour. 

 High, and low yield of grain. 

 Early, and late ripening of grain. 

 Susceptibility and immunity to yellow rust. 



(Spillmann, Tschermak, Biffen, John Wilson, and Nilsson — Ehle.) 



Tropaeolum. 



Tall, and dwarf habit of growth. 

 Red, and yellow flowers. (Weiß.) 



Ulmus. 



Opposite, alternate, small, and large leaves. 

 Long, and short petioles in the Elm. (Henry.) 



Urtica. 



Much serrated, and little serrated edges of leaves in the Nettle. 

 Green, and yellow-green (Chlorina) leaves. (Correns, and Baur.) 



Verbascum. 



Yellow, and white flowers. (Shull.) 



Veronica. 



Blue, and white flowers. (de Vries.) 



Viola. 



Dissected, undissected, pubescent, and glabrous leaves in the 

 Violet. 



