stiff gentian vs Gentiana quinquefolia

stiff gentian and Gentiana quinquefolia both are nouns.

Word	Noun	Adjective	Verb	Adverb
stiff gentian	Yes	No	No	No
Gentiana quinquefolia	Yes	No	No	No

As nouns, stiff gentian and Gentiana quinquefolia are synonyms defined as:

stiff gentian and Gentiana quinquefolia: gentian of eastern North America having clusters of bristly blue flowers

Other synonyms of stiff gentian include ague weed, agueweed, five-flowered gentian, Gentianella quinquefolia.

stiff gentian (noun)	Gentiana quinquefolia (noun)
gentian of eastern North America having clusters of bristly blue flowers	gentian of eastern North America having clusters of bristly blue flowers