bitterweed

• Substantivo que designa várias plantas daninhas, incluindo o falso-cardo (Jacobaea vulgaris), erva europeia de folhas lobadas com flores amarelas naturalizada nos EUA, e diversas plantas norte-americanas do gênero Ambrosia que produzem pólen altamente alergênico, causador de febre do feno e asma.

A noun referring to any of several weedy plants, including a widespread European weed with spiny tongue-shaped leaves and yellow flowers naturalized in the United States, or various North American plants of the genus Ambrosia that produce highly allergenic pollen causing hay fever and asthma.

1. B2formalscientific

   A widespread European weed with spiny tongue-shaped leaves and yellow flowers, naturalized in the United States.

   erva-amarga

   • Bitterweed can be found in many fields across the Midwest.
   • The yellow flowers of bitterweed bloom in late summer.
   • Farmers often try to control bitterweed because it spreads quickly.

   Sinônimosoxtongue

2. RagweedB2formalamericanscientific

   Any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma.

   Ambrósia

   • Bitterweed pollen is a major cause of seasonal allergies.
   • Many people suffer from hay fever due to bitterweed in late summer.
   • Bitterweed plants release large amounts of pollen into the air.

   Sinônimosambrosiaragweed