purple clematis vs Clematis verticillaris

purple clematis and Clematis verticillaris both are nouns.

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

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

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

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

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