The Collaborative International Dictionary of English v.0.48:

Rupturewort \Rup"ture*wort"\ (?; 135), n. (Bot.)
   (a) Same as Burstwort.
   (b) A West Indian plant (Alternanthera polygonoides)
       somewhat resembling burstwort.
       [1913 Webster]

WordNet (r) 3.0 (2006):

rupturewort
    n 1: common prostrate Old World herb often used as a ground
         cover; formerly reputed to cure ruptures [syn:
         rupturewort, Hernaria glabra]