ELEMENTS OF STRUCTURAL BOTANY. 



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of four carpels uuited together, aud is therefore 

 sijncarpoK.s. Every seed is furnished with a tuft of silky 

 hairs, which greatly facilitates its transportation by the 

 wind. 



42. The Willow-herb furnishes an excellent example 

 of what is called syvunctnj. We have seen that the 

 calyx and corolla are each made up of four parts ; the 

 stamens are in two sets of four each ; the stigma is 

 four-lobed, aud the ovary has four seed-cells. A flower 

 is si/ni metrical when each set of floral leaves contains 

 either the same number of parts or a muUiple of the 

 same number. 



Observe that the leaves of our plant are net- veined. 



The schedule will be filled up as follows : 



GREAT WILLOW-HERB. 



48. Sweet Brier. As in the flower iue<r^eamined, the 



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