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It must be grown as a bottom-plant, and flourishes only when rooted. The Nitella is another pleasing variety. The Ranunculus aquatilis, or Water-Crowfoot, is to be found in almost every pond in bloom by the middle of May, and continues so into the autumn. It is of the buttercup family, and may be known as a white buttercup with a yellow centre.
As the material thus necessary to life seems to abound more in air than in water, the subaquatic leaves of this plant, and of sisymbrium, coenanthe, ranunculus aquatilis, water crowfoot, and some others, are cut into fine divisions to increase the surface; whilst those above water are undivided.
Sistrum fiscellum, Chemnitz. 21. Sistrum tuberculatum, Blainville. 22. Harpa solida, A. Adams. 23. Fasciolaria trapezium, Lamarck. 24. Turbinella cornigera, Lamarck. 25. Triton maculosus, Reeve. 27. Triton aquatilis, Reeve. 28. Solarium perspectivum, Linne. 33. Cypraa arabica, Linne. 34. Cypraa pantherina, Linne. 35. Cypraa camelopardalis, Perry. 36. Cypraa carneola, Linne. 37.
If the leaves of many water-plants are thread-like or assume the form of antlers, we are inclined to attribute it to lack of complete anastomosis. The growth of the water buttercup, Ranunculus aquatilis, shows this quite obviously, with its aquatic leaves consisting of mere thread-like veins, while in the leaves developed above water the anastomosis is complete and a connected plane is formed.
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