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A TEXTBOOK OF THEORETICAL BOTANY 



retain a more or less functional anther attached (Fig. 1087). In completely 

 petaloid stamens pollen formation is generally suppressed or if a remnant 

 of an anther persists, only sterile pollen is formed. 



Fig. 1087. — Flower of Rhododendron with petaloid stamens, in front and side views. 



Fig. 1088. — A double Fuchsia. Only the 

 petals are affected by chorisis, which has 

 increased their number. 



Transformation of organs is 

 not, however, the only way in 

 which doubling of flowers occurs; 

 additional organs may be pro- 

 duced by the serial (tangential) 

 chorisis of existing organs. In the 

 double Pink {Dianthus) the sta- 

 men rudiments divide repeatedly 

 in this manner, some of the seg- 

 ments becoming petaloid, others 

 developing into normal stamens. 

 In the double Fuchsia, on the 

 contrary (Fig. 1088), chorisis 

 afl^ects only the petals, the num- 

 ber of which is greatly increased, 

 forming several whorls, without 

 the androecium being affected. 

 Occasionally both methods, peta- 

 lody and chorisis, may be com- 

 bined, with the result that double 

 flowers are formed in which the 

 number of petals exceeds the 



