SELF - POLLINATION 83 



be not cross-pollinated within the first three days, remains per- 

 manently closed, and its anthers, coming into contact with 

 the stigma, effect self-pollination. The Pansy (see page 129) 

 has two kinds of flowers, the large variegated ones, which are 

 cross-pollinated, and smaller ones, similar in shape, which 

 remain closed and pollinate themselves. Finally, the Violet 

 and the Woodsorrel, in addition to possessing their familiar 

 conspicuous flowers, which are cross-pollinated, also have 

 minute green and bud-lrke flowers of quite different form. 

 These latter never open : they are peculiar self-pollinating or 

 cleistosamic flowers. 



