Thalia geniculata ( Thalia )
Geniculata is an evergreen , marginal aquatic perennial with ovate to lance - shaped , gray - green leaves . produce purple blossom in lax , pendent panicles . In general , Thalia is native to swampy areas from the Southeastern United States , down to Argentina and the West Indies . leaf are ellipse and fishgig - shaped , atop farsighted stalks , giving them a elegant appearance . Violet flowers have enlarged staminoides and take shape branched panicles ....