24 SOUTH AFRICAN FLOWERING PLANTS. 



shed their pollen, they shrivel up and fall off. By 

 this time the stigmas are ready, and the style curves 

 upwards and spreads out its five stigmas (11.) just 

 where the anthers stood ; so that they sweep off the 

 pollen from tlie next insect that comes, which has 

 previously visited some other flower in the earlier stage. 

 You must look for flowers of Pelargo'iiiums in 

 these two stages ; you will easily detect them. 



I. IT. 



Fig. 13. — Duvernoi'a. I. Flower. II. Ditto with bee. 



ISTow you will understand how all the parts of 

 the flower are fitted to receive the visitor, which, in 

 return for the free gift of honey, pollinates the flowers. 



Irregular flowers very often have their stamens 

 grouped together but standing erect facing the front 

 of the flower and not declinate. 



Thus, those of a tree or shrub often cultivated in 

 South Africa, and called Dwernoia (Adhatoda), shows 

 this. 



Look at Fig. 13, and you will see how the two 



