Eurasian herb having loose heads of button-shaped white flowers and long gray-green leaves that cause sneezing when powdered.

 
  • 欧亚的一种药草,具有由纽扣形状的白花构成的松散花序和长的灰绿色的叶子,其叶被弄成粉后会使人打喷嚏。
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