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Which Menyanthaceae genus has floating leaves resembling water-lily leaves?
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Asterales
True, or English, daisy (Bellis perennis).
The genus within the Menyanthaceae family that features floating leaves resembling those of a water lily is Nymphoides.1
It is important to note that while some sources may historically categorize the family Menyanthaceae under the order Gentianales, it is currently classified within the order Asterales. Members of the genus Nymphoides, which include the floating heart, are aquatic plants characterized by their submerged rootstalks and floating foliage.12