pro·cum·bent /proˈkʌmbənt/
  (a.)平伏的,匍匐的
  pro·cum·bent /(ˈ)proˈkəmbənt/ 形容詞
  (拉procumbens)平鋪的,平伏的,匍匐的
  Pro·cum·bent a.
  1. Lying down, or on the face; prone. “ Procumbent each obeyed.”
  2. Bot. Lying on the ground, but without putting forth roots; trailing; prostrate; as, a procumbent stem.
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  procumbent
       adj : having stems that trail along the ground without putting
             down roots