THE STUDY OF FLOWERS. 



233 



protruding from the flower, whilst the unripe stamens are 



curled up below with 



the anthers directed 



inward. By the time 



these have ripened 



and have been turned 



outward in the mouth 



of the corolla the style 



has withered (Fig. 



99). 



~ -STYLE 



Heterostyly.The ^ ^V \a^. STAMEN 



case of the Primrose 

 should be understood. 

 If a collection of prim- 

 roses be examined 

 two types of flower 

 will be found, viz. 

 those in which the 

 pin- like stigma is seen 

 just in the throat of 

 the corolla (pin-eyed), 

 and others where no 

 stigma is visible but 

 instead the stamens 

 ("thrum - eyed"). 

 Further examination of the 

 flowers shows that the former 

 type has a long style and 

 short stamens, and the latter 

 a short style whose stigma 

 stands at the same level as 

 the stamens of the other 

 type, and stamens at the top 

 of the tube on a level with 



,, ,. P xl . -, Fig. 101. Section of Iris. On the right 



the stigma or the pin-eyed J sty i e is cut in half lengthwise, 



tvnp flTicr lOfh showing its relation to the stamen 



type <*lg. 1UUJ. which may be seen below. The style 



In thlS Case CrOSS-f ertlllSa- on the left is shown entire. 



tion " is rendered more cer- 

 tain by the fact that insects in visiting the flowers touch 



