Interesting willow which we like a lot from a Hinkley collection in Sichuan. An upright plant at 9' in the garden here and no idea of ultimate height but we guess small tree at most.  Very small leaves clad the stems and the thin catkins are,,,,,,well, willowy.  Keying Salix gives us a bit of a headache as the genus is just one big open marriage in the wild with hybridity very common but we will suss it out.

A graceful Willow from SE France and Italy often referred to as the Rosemary Willow.  The narrow leaves are bright silver white underneath which contrast nicely with the burnished mahogany stems on the new growth,  This can be trained to a small tree or coppiced for a dense bush.

Creeping Himalayan Willow or Lindley's Willow.  Use this as a small ground cover or a small spiller over a wall or container with its new growth having reddish stems and last year's stems sporting cute little catkins. Not a fan of hot climates, this is for cooler northern gardens and will be hardy to zone 4.  John Lindley would be proud.

Nothing willowy about this Chinese Willow! Stiffly erect stems hold large rounded leaves evocative of Magnolia than Salix.  Pinkish new growth adds to the charm and the catkins are impressive on this male clone.  Likes a good moist soil to to really do its best.