stiff gentian vs Gentianella quinquefolia

stiff gentian and Gentianella quinquefolia both are nouns.

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

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

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

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

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