136 SUMMER FLOWEUS. 



Calyciflores : Polypetalous dichlamydeous plants, w ith 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. 

 X Ovary superior, the calyx distinct from the carpels. 



19. Leguminous plants — herbs or shrubs ; 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. 



XX 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. 



tt Carpels combined into an undivided ovary, tvith more 

 than one placenta ; (ovary superior). 



23. Lythraeeous 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 



