Hygrophila corymbosa 'Siamensis' is a species that is very variable in the wild, and this is a thinner leaved variety.  Narrow Leaf Temple as it is sometimes referred to in the trade, is a strong growing, undemanding aquarium plant that is best suited for the background areas.   It can be used further forward, but them will require frequent trimming and replanting.

Place your order by 6 pm EST Sunday and it will arrive the same week by Friday.