http://132.229.93.11/Cryptocoryne/Gallery/wal/wal.html
The above link talks about C.Lutea and its close similarity to C.Walkerii. Having browsed many different sites I am also kidda confused, but there seems to be a consensus that C.Walkerii is what was formerly known as C.Lutea.
As for using the leaf shape to determine any particular species, this is highly impossible because many plants share leaf morphological changes. I can attest to this because my old Wendtii 'red' and 'green' have totally different leaf shape and color to my new Wendtiis that I recently got. If you simply look at them you could not tell they are the same plant species. Also, the 'Lutea'(Walkerii) I got looks different than yours. Mine has a somewhat puckered leaf with spots on it. Sorry, man. I know I didn't help much; if any, I probably made you more confused
Paul
The above link talks about C.Lutea and its close similarity to C.Walkerii. Having browsed many different sites I am also kidda confused, but there seems to be a consensus that C.Walkerii is what was formerly known as C.Lutea.
As for using the leaf shape to determine any particular species, this is highly impossible because many plants share leaf morphological changes. I can attest to this because my old Wendtii 'red' and 'green' have totally different leaf shape and color to my new Wendtiis that I recently got. If you simply look at them you could not tell they are the same plant species. Also, the 'Lutea'(Walkerii) I got looks different than yours. Mine has a somewhat puckered leaf with spots on it. Sorry, man. I know I didn't help much; if any, I probably made you more confused
Paul