My memory is failing me again and I can't remember what plant this is; spindly, approximately 4 feet in height, lower leaves larger than upper. It's growing amidst Ixora and Nightshade shrubs along with a bunch of other weedy plants/vines (Virginia Creeper, Bitter Gourd, Mikania scandens.) It was difficult to get decent pictures over the fence but I'm hoping someone will recognize it.

Something in the Amaranth Family.

Dave, thanks so much for your help! I thought it was something in the Amaranth family but just couldn't seem to find an exact match. I was originally leaning towards Amaranthus hybridus http://www.missouriplants.com/... but the description doesn't match because like many other Amaranth, that one is said to have hairy stems. The stems and leaves on the plant in my yard are smooth and I did find couple (A. tuberculatus: A. powellii that have smooth leaves and stems but it's difficult to say for sure if mine is either of those.

Again, thanks for your input and confirmation that the plant is in the family Amaranthus.

Hi Lyn, I don't know about the plant being an Amaranth (Amaranthus), but it at least looks to be in that Family, Amaranthaceae.