nitweed

/ˈnɪt wiːd/
noun
  1. A common name for several plants, especially those of the genus Sida or related weeds that are small and troublesome.
    • She identified the plant as nitweed because of its tiny, sticky seeds.
    • Nitweed can quickly overtake a garden if not removed early.
    • The farmer spent the afternoon pulling nitweed from the soybean field.