sneezeweeds

Noun

sneezeweed (countable and uncountable, plural sneezeweeds)

1. (US) A plant of the genus Helenium, especially Helenium autumnale.
   • "Sir, you mustn't shout."
     "I want to reverse the decline. Rebound to boom. Land in a field of golden sneezeweed."
     "Sir, I don't have the faintest idea what you're talking about. I must hand over now to the manager."1963, J P Donleavy, A Singular Man, published 1963 (USA), page 247
2. (Australia) A plant of the genus Centipeda; either of the species Centipeda cunninghami or Centipeda minima, which induce sneezing and are known as a folk remedy for colds and allergic reactions.
   • Centipeda Two species of sneezeweed are found in wet places, often at the fringes of wetlands where they may be flooded during heavy rain. C. cunninghamii is the larger plant, an upright perennial with coarsely toothed leaves up to 3 cm long; it is found through much of eastern Australia other than...1998, Nick Romanowski, Aquatic and Wetland Plants: A Field Guide for Non-Tropical Australia, page 19

   Synonyms:

   old man weed, scent weed

3. Synonym of sneezewort (Achillea ptarmica).

   Synonyms:

   sneezewort