dwarf grey willow vs Salix tristis

dwarf grey willow and Salix tristis both are nouns.

Word	Noun	Adjective	Verb	Adverb
dwarf grey willow	Yes	No	No	No
Salix tristis	Yes	No	No	No

As nouns, dwarf grey willow and Salix tristis are synonyms defined as:

dwarf grey willow and Salix tristis: willow shrub of dry places in the eastern United States having long narrow leaves canescent beneath

Other synonyms of dwarf grey willow include dwarf gray willow, sage willow.

dwarf grey willow (noun)	Salix tristis (noun)
willow shrub of dry places in the eastern United States having long narrow leaves canescent beneath	willow shrub of dry places in the eastern United States having long narrow leaves canescent beneath