… is a plant that reminds me of a young sprig of Johnson grass, which I remember from chopping cotton as a kid, but which my wife tells me is citronella grass, from which the oil is derived, supposedly. The smell is the same. It works, proven, as an insect repellent. Besides the mosquito screens on the windows, this is another line of defense against pesky and potentially dangerous(as in, dengue fever) bugs.
But it still looks like Johnson grass to me.