STRUCTURAL BOTANY. 11 



d. Flowers wliicli are barely furnished with the essen- 

 tial organs (stamens and pistils) are denominated Achhr 

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

 ment {xhijivs), perianthless. (PI. XII., 2«.) 



e. There are flowers designated as Imperfect, Separate, 

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

 ring either on the same specimen or on separate specimens 

 of a species. One sort we call Stamiinate 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, IIJ; PI. III., 85, 8c.) 



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 Mon<BGious 

 flowers (inonoscious : 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 Dicecious flowers (diosoious: in two 

 households). 



Therefore, we divide the plants with diclinous flowers 

 into monoecioiis and dioecious plants. 



39. Not unfreqnently 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 rather of monceciously and diceciously polygamous 

 plants. 



40. The leaves of the Perianth, loth sepals amd petals, 

 are either sepa/rate or tmited. 



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



