Canna indica vs canna

Canna indica and canna both are nouns.

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

As nouns, canna is a hypernym of Canna indica; that is, canna is a word with a broader meaning than Canna indica:

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

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