Achillea ptarmica Achillea ptarmica /əˈkɪliə tɑrˈmaɪkə/

noun

1. Eurasian herb having loose heads of button-shaped white flowers and long grey-green leaves that cause sneezing when powdered  ( Achillea ptarmica , sneezeweed yarrow , sneezewort )
   Eurasian herb having loose heads of button-shaped white flowers and long grey-green leaves that cause sneezing when powdered