| autumn sneezeweed | (n) North American perennial with bright yellow late summer flowers, Syn. Helenium autumnale |
| orange sneezeweed | (n) stout perennial herb of western United States having flower heads with drooping orange-yellow rays; causes spewing sickness in sheep, Syn. Helenium hoopesii, owlclaws |
| sneezeweed | (n) any of various plants of the genus Helenium characteristically causing sneezing |
| sneezeweed yarrow | (n) Eurasian herb having loose heads of button-shaped white flowers and long grey-green leaves that cause sneezing when powdered, Syn. sneezewort, Achillea ptarmica |
| Sneezeweed | n. (Bot.) A yellow-flowered composite plant (Helenium autumnale) the odor of which is said to cause sneezing. [ 1913 Webster ] |