342 



MODIFIED CIKCUMNUTATION. 



CuAP. vr. 



base of each leaflet is developed (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 of 



Fig. 138 



Lnpinus pubescens: A, leaf viewej laterally during the day; B, same leaf 

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

 night. Figures reduced. 



I,, pubescens ; and in the accompanying figures vre see at A (Fig, 

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

 plant at night with the two upper leaves having their leaflets 

 almost vei-tical. At C 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 



