If you want a small bush, "Snow on The Mountain," or "Yesterday Today and Tomorow" do well.

maybe some artesmia, the silver kind, to be reflective of the moonlight. I have some here in zone 8 that is flourishing in the heat and sun, smells good too and grows fast.

Tuberose... it has the sweetest scent right after dusk. It likes it hot and dry. I think it originates from mexico

jasmine (maid of orleans), white lantana?, some kind of silver thyme for texture/fragrance, some sedum blooms white..

Here's one that looks pretty

Here is a link that might be useful: Datura, Angel's Trumpet