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Naturalized in a ditch.
I think this plant should not be identified as Nymphoides cristata since this name is confused with N. hydrophylla, both them had been applied on the same taxon which is native to Taiwan. The unknown Nymphoides in this observation should be an alien species to Taiwan.

大苦草 Vallisneria gigentia
簡誌第五卷：「生長於水塘中。如今，野生者僅見於宜蘭福山水池中。」
According to Manual of Taiwan Vascular Plants, vol. 5 “This species grows in ponds. Nowadays, the wild population only appears in the pond in Fushan, Yilan.”