WordNet (r) 3.0 (2006):

beggar lice
    n 1: Eurasian and North American plants having small prickly
         nutlets that stick to clothing [syn: beggar's lice,
         beggar lice]
    2: any of various tropical and subtropical plants having
       trifoliate leaves and rough sticky pod sections or loments
       [syn: tick trefoil, beggar lice, beggar's lice]