SYSTEMATIC ARRANGEMENT. 221 



Polypetalous Exogens. 



Subclass I. Polypetalous Plants. 

 The groups are seven ; namely — 



1. Albuminous; a very minute embryo in the midst of 



a large quantity of albumen. This group is sepa- 

 rated from the following, because of its remark- 

 able character, and may comprehend all the 

 modifications of structure by which the six fol- 

 lowing groups are known. In none of the latter 

 is there an embryo much smaller than the albu- 

 men ; so that, in analyzing the subclass, the 

 student may divide it into two parts, one con- 

 sisting of the albuminous group exclusively, and 

 the other of the six other groups. 



2. Epigynous ; a large embryo ; an inferior ovary ; the 



placentation not parietal ; the carpels consoli- 

 dated ; the calyx in a perfect whorl. 



3. Parietose ; a large embryo ; an inferior or superior 



ovary indifferently ; the placentce parietal ; the 

 carpels consolidated ; the calyx in a perfect 

 whorl. 



4. Calycose ; a large embryo ; a superior ovary ; the 



placentae not parietal ; the carpels consolidated 

 or not ; the calyx in a broken whorl. 



5. Syncarpous ; a large embrjo ; a superior ovary ; 



the placentae not parietal; the carpels consolidated; 

 the calyx in a perfect whorl, 

 i). Gynobaseous ; a large embryo ; a superior ovary ; 

 the cells of which are placed obliquely round a 

 conical centre^ and do not exceed five in number ; 



