threatened aquarium plants?

Hi all, has anyone ever seen/made a list of aquarium plants which are threatened in nature? I know for instance that many Cryptocoryne are endemic to single streams and some of them are highly threatened (habitat converted to oil palm plantations). But how about other aquarium plants?   What I want with this question: if I put a threatened plant in my Goodeid aquarium, I preserve 2 strains for the efford of 1 :-) So, which plants should I choose? Paul