SEED-BEARING PLANTS 449 



400. Complete Flowers. In the majority of Angio- 

 sperms the flower, in addition to the essential organs, 



FIG. 333. Arrow-leaf (Sagittaria). At the left, branches with staminate 

 flowers only; in the middle, branches with pistillate flowers only; at the 

 right, pistillate branch, bearing fruit. 



possesses a calyx or a corolla, or both. Flowers possessing 

 both kinds of floral envelopes and both kinds of essential 

 organs are called complete. 

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