Clematis verticillaris vs purple clematis

Clematis verticillaris and purple clematis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Clematis verticillaris	Yes	No	No	No
purple clematis	Yes	No	No	No

As nouns, Clematis verticillaris and purple clematis are synonyms defined as:

Clematis verticillaris and purple clematis: climber of northeastern North America having waxy purplish-blue flowers

Other synonyms of Clematis verticillaris include mountain clematis, purple virgin's bower.

Clematis verticillaris (noun)	purple clematis (noun)
climber of northeastern North America having waxy purplish-blue flowers	climber of northeastern North America having waxy purplish-blue flowers