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Heh, that could be anything, really...there's no sure way to even say that it's L. repens.

IMO, the possibilities include:

Ludwigia repens
L. palustris
L. repens x L. palustris (the likeliest, I think)
L. repens 'Rubin'

Where did you get it?
 

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Cavan Allen said:
It's definitely not palustris. It's more likely repens or the palustris/repens hybrid.
I don't think there's any way to say that for certain; several forms of plants I flowered over the summer that greatly resembled the classic L. repens turned out to be L. palustris. The species are very similar in everything but the flowers and I don't think there's much of a chance to get a positive ID from the vegetative characteristics.

Nate, if you want to donate a stem I can flower it this summer and see what I get ;)
 

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You can never be 100% sure, but they aren't so similar that you can't see any vegetative differences. I'd be willing to bet that if you flower that stuff, you'll get some petals.
 

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Discussion Starter · #7 ·
Thanks

As you may notice from the picture the plant is about grow out of the water. Will that flower soon, or how do I get it to flower?

I have plenty of stems of this mystery and it grows fast. I'd be happy to send out samples.
 

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Just let it grow up out of the water. Flowers will be in pairs at the nodes. If there are any yellow petals, that instantly rules out L. palustris.
 
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