Sphenoclea

There are two species, S. zeylanica and S. pongatium. The genus is placed alone in family Sphenocleaceae. The position of the family is somewhat uncertain; it is now usually placed in Solanales, but it has previously been placed in Asterales, especially near Campanulaceae, and there is some evidence to support this. ...
Found on http://en.wikipedia.org/wiki/Sphenoclea

Sphenoclea

the only genus in the plant family Sphenocleaceae (order Solanales). It contains two species. Sphenoclea zeylanica is an herb 1.5 metres (4 feet) ...
Found on http://www.britannica.com/eb/a-z/s/139
No exact match found