136 SUMMER FLOWERS. 



Calyciflores: Polypetalous dichlatnydeous plants, with the 

 petals usually distinct, and the stamens perigynous or epigy- 

 nous ; Orders 19 to 27. 



* Stamens perigynous. 

 t Carpels more or less distinct, or single. 

 % Ovary superior, the calyx distinct from the carpels. 



19. Leguminous plants herbs or shruhs; flowers very irre- 



gular, papilionaceous ; stamens 10, all or 9 of them united ; 

 ovary single, becoming a legume. 



20. Rosaceous plants herbs or shrubs ; flowers regular, rarely 



without petals ; stamens indefinite ; fruit 1-2 -seeded nuts 

 or drupes, sometimes enclosed within the fleshy tube of the 

 calyx, or follicles containing several seeds. 



21. Crassulaceous plants herbs, with succulent leaves ; flowers 



regular ; the sepals and petals usually five (sometimes 3-4 

 or 6-20), isomerous ; carpels as many as the petals, free. 



J J Ovary superior or half -inferior, the calyx adhering more 

 or less to the carpels. 



22. Saxifragaceous plants herbs ; flowers regular ; stamens 



definite ; ovary syncarpous at the base, with a separate style 

 for each carpel. 



ft Carpels combined into an undivided ovary, ivith more 

 than one placenta ; (ovary superior). 



23. Lythraceous plants herbs ; leaves opposite ; sepals four, 



five, or more, united below into a tube ; petals as many, in- 

 serted at the top of the calyx-tube ; stamens as many or 

 twice as many as the petals. 



** Stamens epigynous ; (ovary inferior) . 

 t Flowers not umbellate. 



24. Onagraceous plants herbs ; leaves simple, usually opposite ; 



flowers complete; sepals and petals four each, with four 



