any of about 40 species of tall herbs constituting the genus Helenium of the family Asteraceae, native to North America. Most are perennials with ... Found on http://www.britannica.com/eb/a-z/s/114
Sneeze'weed` noun (Botany) A yellow-flowered composite plant ( Helenium autumnale ) the odor of which is said to cause sneezing. Found on http://www.encyclo.co.uk/webster/S/132