Weedlady, I was wondering about that too. Is the name of the particular grass wanted, or is the fact that it's grass the mystery?

Agreed. Do you have a spot closer to a window for it? Could be a bit more perky with more light.

Is this tropical? Almost looks like a kind of plumeria (perhaps P. obtusa) that has not gotten enough light (and maybe has spider mites).

I was going to say the same thing but waited. If it is something that you have planted in rows, 18" apart, then its got to be some garden veggies not morning glories. So, as Fatamorgana has suggested, it might be sweet potatoes. I have not seen anything other than morning glories with three-lobed leaves. Never planted sweet potatoe. Passiflora Incarnata has similar leaf shape, but I doubt that you planted that one.