Hummingbird and Butterfly Gardening: Caterpillar ID, 1 by P_Edens

P_Edens wrote:
I am trying to ID this caterpillar. I have looked at many on-line sites and cannot seem to find it. I tried to see if I could get an ID on the plant it is on in the Plant ID forum here so that I could narrow down the type of caterpillar by the food it was eating, but they suggested I post the caterpillar here, so here goes...

It was found on Monday at Willis Texas (just North of Houston) on a plant that was near a pond. It is around 4 inches long.

I would appreciate any help.