Alternanthera polygonoides

from 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]