CLASSIFICATION OF ANGTOSPERMS. 



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FIG. 253. Arrow-head (Sagittaria latifolid), a common marsh or aquatic plant and 

 very widely distributed. The leaves are variable, but almost always sagittate. It produces 

 naked scapes which are sheathed by the bases of the petioles; the white flowers are produced 

 all summer. After Troth. 



30 



