Wild Iris, by Louise Gluck
I am loving the conceit that it is all a conversation between the two in Eden, in the beginning, and the One who created them.
Special thanks to syringe1901, who lent me her copy of the book (with notes! i.e., "sooooobbb!"
The Art of Syntax, by Ellen Bryant Voigt
Still digesting this. But this, I think, is the kind of thing I've been looking for. It has a wonderful discussion of Larkin's Cut Grass yesterday, which made me appreciate what was good about it. The lyric is deceptively simple, but actually very complicated, syntactically. Much to think about. Much to ponder. Definitely something to use. :)