What does "tall sunflower" mean?

very tall American perennial of central and the eastern United States to Canada having edible tuberous roots

What is a synonym for "tall sunflower"?

Common synonyms include: giant sunflower, helianthus giganteus, indian potato.

Rare ·Advanced level

Noun

1
very tall American perennial of central and the eastern United States to Canada having edible tuberous roots wordnet