| Kingdom | Plantae | Plants, but not fungi, lichens, or algae |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Magnoliophyta | Flowering plants, also known as angiosperms |
| Class | Liliopsida | Monocots (plants with a single seed leaf); includes the lily family |
| Subclass | Liliidae | Includes lilies, orchids, and many others |
| Order | Liliales | Includes lilies, tulips, trilliums, greenbriars, and others |
| Family | Pontederiaceae | Aquatic plants that are “heterostylous”—different members of the same species can have different-appearing flowers |
| Genus | Eichhornia | Named for Prussian Minister of Education and Public Welfare Johann Albrecht Friedrich Eichhorn |
| Species | crassipes | “With a thick stalk” |
Eichhornia speciosa Kunth
Piaropus crassipes (Mart.) Raf.
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