hə̇ˈlēnēəm noun
Etymology: New Latin, from Latin, a plant, elecampane, from Greek helenion, perhaps from helenē wicker basket; akin to Greek helix (adjective) twisted, (n.) spiral, anything of spiral shape, helissein to turn, wind, eilein to wind, roll, eilyein to enfold, enwrap — more at voluble
1. capitalized : a genus of American herbs (family Compositae) with heads of yellow-rayed flowers and truncate-style branches — see sneezeweed 1
2. -s : any plant of the genus Helenium