EXPLANATION OF THE PLATE. 



Plate CCCXVL Planera aquatica. 



1. A flowering branch, natural size. 



2. A staminate flower, enlarged. 



3. A stamen, rear view, enlarged. 



4. A pistillate flower, enlarged. 



5. Vertical section of a pistillate flower, enlarged. 



6. Cross section of an ovary, enlarged. 



7. An ovule, much magnified. 



8. A fruiting branch, natural size, 



9. A fruit, enlarged. 



10. Vertical section of a fruit, enlarged. 



11. A seed, enlarged. 



12. An embryo, much magnified. 



13. A winter branch, natural size. 



14. A winter-bud, enlarged. 



15. A summer branch, natural size. 



