342 



MODIFIED CIRCUMNUTATION. 



CHAP. 



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 

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

 occurs with the leaves of a species purchased under the name c/ 



Fig. 138 



Lupinus pubescens: A, leaf viewed laterally during the day; B, same-leaf 

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

 night. Figures reduced. 



//. pubcscens ; and in the accompanying figures we 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 vertical. 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 



