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SUMMARY OF SUMMER FLOWERS. 



[I.— GKOUPS AND ORDEES.] 



EXOGENOUS PLANTS or DICOTYLEDONS. 



Leaves with netted veins. Floivers usually quinary — the 

 parts in fives, or quaternary — the parts in fours. Embryos 

 with two (rarely more) cotyledons ; hence dicotyledonous. This 

 group includes the Thalamiflores, Calyciflores, Monopetals, and 

 Monochlamyds. 



Thalamiflores : Polypetalous dichlamydeous plants, with 

 petals distinct [i. e. separable) from the calyx, and the stamens 

 hypogynous; Orders numbered 1 to 18. 



* Carpels more or less distinct (\. e. apocarpous), sometimes 

 solitary with one lateral placenta. 



1. Ranunculaceous plants — herbs or climbing shrubs ; stamens 



indefinite, usually numerous, inserted on the receptacle. 



** Carpels combined into an undivided (i.e. syncarpous) ovary. 



t Seeds attached to the spongy dissepiments (i. e. placentas 

 dissepimentalj . 



2. Nympliseaceous plants — aquatic herbs, with the carpels im- 



bedded into the receptacle, or combined into a single many- 

 celled ovary. 



tt Seeds attached to tlie sides of the carpels (i. e. placentas 

 parietal) . 



X Stamens indefinite. 



3. Papaveraceous plants — herbs ; flowers regular, with two 



sepals and four petals ; stamens numerous. 



