342 



MODIFIED CIRCUMNUTATION. 



CiiAp. vr. 



base of each leaflet is dsTeloped (at least in the case of L. luteus) 

 into a pulvinus. The result is that all the leaflets on the 

 same leaf stand at night more or less highly inclined, or even 

 quite vertically, forming in this latter case a vertical star. This 

 occurs with the leaves of a species purchased under the name oi 



Tu}inus pidiescens : A, leaf viewea laterally durr g the day; B, same leaf 

 at night; C, another leaf with the leaflet forming a vertical star :it 

 iii^ht. Figures rednced. 



/,. pub scens ; and in the accompanying figures we see at A (Pig. 

 1.38) the leaves in their diurnal position; and at B the same 

 plant at night with the two upper leaves having their leaflets 

 almost vertical. At another leaf, viewed laterally, is shown 

 with the leaflets quite vertical. It is chiefly or exclusively the 

 youngest leaves which form at night vertical stars. But there 



