[Tiger15]

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.

 

[Tinanti]

That's Ludwigia repens x L. arcuata. It's often mislabled as palustris.

 

[Tiger15]

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.

 

[Tinanti]

Yes, repens (with an S) does have wider leaves. It's a bit hard to find the real thing in the trade though. But possible to find your own.