Spirally '/'misled Races. 
551 
growth, as in Dipsacus. Altogether I counted amongst 
somewhat over 4600 normal stems, 53 more or less dis- 
tinctly twisted ones in all degrees of development, 33 
torsions extending over a greater part of the shoot and 
Fig. 130. The dark-eyed Viscaria (Viscaria oculata) with 
spiral torsion of the main stem, a, the terminal flower 
of this main stem ; the flowerstalk, first bent downwards 
by the torsion, has subsequently turned upwards again. 
b, c, the normal straight portion below the twist ; d, a 
local interruption of the torsion (1900). 
