218 



BUDS AND STIPULES 



Goebel's experiments. In each case two seeds of the 

 same weight were sown together : 



2nd 

 3rd 



Plant 2. 1st 



2nd 



3rd 



4th 



5th 



It is probable, however, that more effect would be 

 produced if the leaf had been extirpated at an earlier 

 stage. 



In other species no corresponding effect followed. 

 The suppression of the stipules in Lathyrus Aphaca, for 

 instance, had no effect in transforming the tendrils into 

 leaf-blades. 



Cotyledons very rarely have stipules. This may, 

 perhaps, be because they are sufficiently protected by 

 the fruit and seed coverings. There are, indeed, a 

 few exceptions, as, for instance, in Genipa clusicefolia 

 (figs. 335-338), where, however, they are very small. 

 They are interpetiolar, united into one ovate, acute 

 piece, colourless and subscarious. 



They occur also in Psijchotria (fig. 339), another 

 genus of Rubiacece, a family of which one of the most 

 constant characters is the presence of stipules. Another 

 instance is afforded by Thelygonum. 



