STRUCTURAL BOTANY. 11 



d. Flowers wliicli are barely furnished with the essen- 

 tial organs (stamens and pistils) are denominated Ac/da- 

 mydeous or leaked flowers. They are destitute of a gar- 

 ment {x^o-V^vs), perianthless. (PI. XII., '2a.) 



e. There are flowers designated as ImjMrfect^ Sejparate, 

 or Diclinous flowers — that is, flowers of two sorts, occur- 

 ring either on the same specimen or on separate specimens 

 of a species. One sort we call Staminate or Sterile flow- 

 ers^ because they have stamens, but no true pistils ; the 

 other sort Pistillate or Fertile flowers^ since they are fur- 

 nished with pistils, but not any (or at least no fertile) sta- 

 mens. (PI. XIII., 11, lib ; PI. III., Sh, Sc.) 



Diclinous flowers may be complete, incomplete, or 

 naked, as the perfect flowers in their turn. 



38. "When sterile and fertile flowers grow on the same 

 specimen or- stem of a species, we call them Monoecious 

 flowers (inoncecious : in one household). When, on the 

 other hand, some specimens of a species have sterile flow- 

 ers, and others fertile ones exclusively, we say that they 

 are furnished with Dioecious flowers {dioecious: in two 

 households). 



Therefore, we divide the plants with diclinous flowers 

 into monoecious and dioecious plants. 



39. Not unfrequently we meet with diclinous flowers, 

 intermixed with perfect ones, both on monoecious and di- 

 oecious plants. In such a case, we speak of polygamous, 

 or leather of monoeciously and dioeciously jpolygamous 

 plants. 



40. The leaves of the Perianth, both sepals and petals, 

 are either separate or united. 



If the Sepals are united so as to form a cup or tube, 



