1955] 



REVISION OF THE GENUS SAGITTARIA 



187 



removed, with north-temperate distribution and typically sagittate emersed leaves. 

 The most northern species, S. cuneata and S. sagittifolia^ are closely related and 

 form a circumboreal complex. S, pygmaea is an Asiatic phyllodial species that 

 probably evolved from 5. sagittifolia, 



ECONOMIC IMPORTANCE 



The winter storage organs of some of the sagittate Sagittariae are edible. The 

 Old World S. sagittifolia is commonly found in rice-paddies, and while not often 

 cultivated, it is encouraged and forms a secondarily valuable food plant (Porter- 

 field 1940), The New World S. latifolia and S. cuneata were formerly sought by 

 Indians and early settlers for food. They are apparently used today only by some 

 naturalized Chinese and Japanese. Folk-lore ascribed some curative properties 

 to various species, but the genus has no use in present day medicine. S. subulata 

 is a useful aerator and ornamental in aquaria. Several other species are occa- 

 sionally in limited cultivation as ornamentals. 



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