| FLORA OF NORTH AMERICA - Volume 1, Chapter 14 (9619 words) |
 | The Nymphaeales may be briefly characterized as those families of the Magnoliidae that are aquatic herbs without ethereal oil cells and without vessels in the shoot. |
| Most of the Nymphaeales have long-petiolate leaves with broad, cordate to hastate or peltate, floating blades, but in Ceratophyllum the leaves are all slender and submersed, and in Nelumbo many of the leaves are emergent. |
| It is here considered that the modern Nymphaeales all descend from a group of primitive dicotyledons that took to an aquatic habitat and became herbaceous very early in the history of the angiosperms. |
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