10 



ALISMACEAE 



[CH. 



FIG. i. Sagittaria sagittifolia, 

 L. Top of inflorescence, August 

 17, 1917. 6* = whorl of male 

 flowers; ? = whorl of female 

 flowers with withered perianths, 

 (fnat. size.) [A. A.] 



FIG. 2. Sagittaria sagittifolia, L. Top of 

 infructescence, September 8, 1917. (f nat. 

 size.) A, Longitudinal section of fruit. [A. A.] 



