shrubby primrose-willow, Ludwigia suffruticosa

Do we need a paternity test for this one? Sure doesn't look a one of the Ludwigs. They have big yellow petals, don't they? And the flowers aren't in spikes. Actually by now someone has probably done the botanical equivalent of a paternity test, and determined that this does fit right in with Ludwigia. But it's still not all that shrubby, more subshrubby. Shrubby primrose-willow likes wetlands in AL, FL, GA, NC and SC. Wakulla Co FL, 7/8/18. Willowherb family, Onagraceae.