606 



WEED FLORA OF IOWA 



Fig. 461. II. Stamlnate flower of the Hazel showing the stamens and bracts. 

 III. Pistillate flower showing pistils and enclosing tracts. IV. Style and 

 two stigmas. Catkin at middle of stem containing the stamlnate flowers; 

 female flower at top of stem. The Hazel is a monoecious plant. 

 (After Thomfi.) 



which bears some perfect flowers and some staminate or pistillate 

 only, is polygamous. 



Fm. 462. Longitudinal section through the hypogynous flower of the Pink, show- 

 ing the attachment of floral parts. 

 (After Thomfi.) 



