DICOTYLEDONS 



209 



What is the numerical plan of the flower ? 

 Which of its circles of organs is lacking in symmetry ? 

 Which sets of organs are adherent to other sets ? 

 Is the flower epigynous or hypogynous ? 



297. Examination of a Perigynous Flower. — Compare 

 with the specimen just examined, a blossom of peach, 

 almond, plum, or cherry. Is its nu- 

 merical plan the same .' Make a dia- 

 gram showing the arrangement of 

 parts in vertical section. Is the calyx 

 inferior or superior ? Where are the 

 petals and stamens inserted ? 



Flowers of this kind, where the 

 ovary is free and the other parts 

 attached to a prolongation of the recep- 

 tacle containing it, are said to be 

 perigynous, meaning " around the pis- 

 til." It is intermediate between the 

 hypogynous and epigynous arrangement, sometimes 

 approaching more nearly to the latter, as in the rose, 

 sometimes remaining clearly of the hypogynous type, as 



404. — Vertical section 

 of an almond blossom 

 with petals removed, 

 showing the perigynous 

 arrangement. 



405 406 407 



405-407. — Diagrams showing arrangement of parts {bd, receptacle; k, calyx; 

 kr, corolla; st, stamens; fi-, ovary; g, style; n, stigma): 405, perigynous; 406, 

 hypogynous ; 407, epigynous. 



in the peach and cherry. In general a flower is not con- 

 sidered epigynous unless the ovary is more or less con- 

 solidated with the parts around it. 



ANDREWS'S BOX. — I4 



