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It took me nearly ten years to collect these species, which can be identified as three species, including one of them containing four different types.
Here is the popular one, C.thalictroides, a submerged type.

 

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This one has been recently identified as a varieties of C.thalictroides from Vietnam, which can grow very large leaves and keep submerged much longer than the former. I will say that this plant is the most delicate one of the genus.

 

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The second one found in northern Taiwan, this one grows less feathery leaves than the first one, and the shape of its leaves changes more drastically than others in low temp.

 

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A floating type of the second one

 

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A close-up photo of its leaves In fact, this is my favorite.

 

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The third one is also found in northern Taiwan. There are lots of rumors that C.cornuta can be found in Taiwan, while I don't think so, this rumored local species tends not to grow submergedly, and we can find many differences on its leaves (especially the growing point) from those of C.cornuta.
Although the aforesaid ones are all identified by our botanists as C.thalictroides I still doubt that the second type might be C.richardii because the feathery leaves growing just like those of C.richardii. Unfortunately I cannot prove it because I don't have a microscope to observe its spores.

 

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This is the real C.cornuta, a floating type.

 

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A close-up photo of its leaves

 

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Possibly the only floating species of the genus, C.pteridoides.
There are 4 to 6 species of the genus according to old literatures, so I think C.richardii and C.froesii could be the ones I have to search for.