canna vs Canna edulis

canna and Canna edulis both are nouns.

Word	Noun	Adjective	Verb	Adverb
canna	Yes	No	No	No
Canna edulis	Yes	No	No	No

As nouns, Canna edulis is a hyponym of canna; that is, Canna edulis is a word with a more specific, narrower meaning than canna:

canna: any plant of the genus Canna having large sheathing leaves and clusters of large showy flowers
Canna edulis: canna grown especially for its edible rootstock from which arrowroot starch is obtained

Other hyponyms of canna include Canna generalis, canna lily, achira, arrowroot, Canna indica, indian shot.

canna (noun)	Canna edulis (noun)
any plant of the genus Canna having large sheathing leaves and clusters of large showy flowers	canna grown especially for its edible rootstock from which arrowroot starch is obtained