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It's fascinating how taxonomy can sometimes present challenges and differing classifications for certain plant species. The botanical classification of the lotus, specifically the Nelumbo species, has indeed shown variation across different taxonomy systems.
The Nelumbo species, which includes the well-known Nelumbo nucifera (sacred lotus), has been subject to debate regarding its taxonomical placement, particularly in terms of family and order classification.
In the past, older systems like the Bentham & Hooker system referred to the lotus as Nymphaea nelumbo, associating it with the water lilies of the genus Nymphaea. However, modern plant taxonomy, represented by systems like the APG IV (Angiosperm Phylogeny Group IV) classification, places Nelumbo species within the genus Nelumbo.
There's disagreement among these systems about the family and order to which Nelumbo should belong. The APG IV system suggests placing Nelumbo (N. nucifera and N. lutea) within Proteales, alongside protea flowers, based on genetic comparisons. On the other hand, older systems like the Cronquist system classified Nelumbo within the order Nymphaeles, possibly due to anatomical similarities.
Interestingly, the APG IV classification also suggests a relationship between Nelumbo and the sycamores (Platanaceae) as close relatives.
The discrepancies in classification highlight the complexity of taxonomy, where various factors such as genetic studies, anatomical features, and evolutionary relationships are considered to determine the placement of a species within a specific taxonomic group. As new research and molecular studies continue to unfold, our understanding of plant relationships and classifications may further evolve.(wikipedia)