3 
4 
Fig. 88. — Nj^mphaea tuberosa of Clear Lake, Iowa. Parts of the water lily 
flower; 1-7 from flower No. 1; 1, lateral sepal; 2, outermost petal; 3, petal 
of third row; 4, petal of inner row; 5, vertical section of ovary showing 
carpellary style, stigmatic half way up the inner face, stigmatic basin, and 
spherical axile process ; 6, outer stamen ; 7, innermost stamen ; 8-11 from 
flower No. 2; 8, lateral sepal; 9, outermost petal; 10, petal of third row; 
11, petal of inner row. All natural size. Collected at Clear Lake, Iowa, 
August 15, 1916. 
