Some would call the wider plant corymbosa Siamensis. It has a narrower leaf than normal corymbosa
+1 It is also a smaller plant, about 1/3 the size of the 'regular' H. corymbosa.
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Here, let me correct my post. What I should have said was:
Hygrophilia corymbosa 'angustifolia' and Hygrophilia corymbosa 'Siamensis'