The Spiral Disposition of the Leaves. 529 
Fig. 123. Dipsacus sylvestris torsus. Two spirally twisted 
main stems, w, root ; r, stem with the scars of the radical 
leaves and at I 5 the windings of the spiral ; g, stalk of 
the terminal inflorescence ; A, leaf-spiral left hand, stem 
right hand; B, leaf spiral right hand, stem left. Stems 
thickened and hollow. 
