noun, plural he·li·an·thus·es.
Examples from the Web for helianthus
The seeds of the sunflower (Helianthus major) have succeeded best with me, and preserved them in health longest.The Natural History of Cage Birds|J. M. Bechstein
This species is the western form of the common sunflower, Helianthus annuus.Flowers of Mountain and Plain|Edith S. Clements
Several species of Helianthus have a tendency to produce similar fleshy tubers at the top of the roots.
So we never met, though she wrote me much about herself and about "Helianthus," which was printed after her death.Alone|Norman Douglas
The Romans saw in the flower of the Helianthus a resemblance to a Lions mouth.Plant Lore, Legends, and Lyrics|Richard Folkard