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Discussion Starter · #1 ·
I have this Ludwigia bought as “ narrow leaf”. As with many common name, it’s non specific of what species it is. For a long time, I thought I had L. repen until I saw a “broad leaf Ludwigia” in my LFS named as repen. In comparison, the two are different in leaf size.

So I did a search on “narrow leaf Ludwigia”, and found species names as diverse as repen, arcuata, Palustris, and hybrid of repen x arcuata or repen x Palustris. What’s more confusing is that there is a needle leaf Ludwigia named as L arcuata.
 

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Discussion Starter · #3 ·
That's Ludwigia repens x L. arcuata. It's often mislabled as palustris.
Thanks. It makes sense to name narrow leaf as a cross between broad leaf and needle leaf. So is the true repen “broad leaf” which has rounder leaves. The two contrast enough that I may plant one next to narrow leaf.
 
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