Looks like Aponogeton natans with the floating leaves, and ulvacues
with the submersed wide leaves. The two crossed together is undulata if
I remember correctly. Those "short" wide leaves, will actually grow
quite long and stay just as wide. The floating leaves will multiply as
well. These two species hybridize in the wild quite easily.

Nah, undulata is the junior synonym for stachsporous (or vice
versa depending on the month :-)


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