STEMS 61 
branches, as observed in the passion-flower, whose long 
and very sensitive tendrils appear in the axils of the leaves 
(Fig. 59). Whether tendrils replace leaves or branches 
Fic. 59.—Plants of passion-flower showing axillary tendrils. 
makes no difference as to their structure and activity, but 
it is of interest to note that different organs may thus be 
replaced by the same organ. 
