Drought tolerant willow?

I know this sounds like an oxymoron, but does anyone know of some willow that is drought tolerant? There are places I'm doing projects that need willow for medicine, feed, diversity, etc but that are dry in summer. The plant would be watered to establishment.

I believe Black Willow Salix nigra, is relatively drought tolerant for a willow.  They grow around here in seasonal creeks as well as along permanent creeks and the river.