STRUCTURE OF THE FLOWER AND ITS ORGANS. 151 
method indicated in Figs. 133 and 135, but making the longi- 
tudinal.section show the interior of the ovary.’ 
I 1} Ill 
FIG. 135. — Diagrams of Cross-Sections of Flowers. 
I, columbine ; II, heath family ; ILI, iris family. In each diagram the dot along- 
side the main portion indicates a cross-section of the stem of the plant. In IJ, 
every other stamen is more lightly shaded because some plants of the heath 
family have 5 and some 10 stamens. 
1 Among the many excellent early flowers for this purpose may be mentioned 
trillium, blood-root, dog-tooth violet, marsh marigold, buttercup, tulip tree, horse- 
chestnut, Jeffersonia, May-apple, cherry, apple, crocus, tulip, daffodil, primrose, 
wild ginger, cranesbill, locust, bluebell. 
