Total guess, as Jay says it's really hard to make out the details, but some kind of weedy Sagina species?

Iris, where was the nursery that sent the M. citriodora located?

Amaranthus blitoides?

Jay, they were coming from Florida.

The plant in the last four photos was dry and had already dropped most of its flowers, fruits, and leaves. Some of the branches in the first shot appear to be healthy. If close shots of those parts are available, then an ID may be possible.

Wireweed. Polygonum aviculare.

I will try to take some decent close up pictures.

I have more pictures

Compare to pigweed, Amaranthus species. The leaves on the flowering stems as pictured are far smaller than those on the lower parts of the plant.

Amaranthus albus

https://www.google.com/search?q=amaranthus+albus&client=ms-android-verizon&prmd=isnv&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj2qP7f-tzjAhUJIqwKHU9hCDoQ_AUIGCgB&biw=320&bih=530

Jay, that looks like a match! Given my lack of rain, it’s kind of funny that one of it‘s common names is tumbleweed.