The Brazilian Sword (Spathiphyllum tasson) is a popular aquarium plant, but is perhaps more popular under a different common name - the Peace Lily. They have dark green elliptical leaves and develop large white flowers. These plants soared to popularity as the plant that tops many betta bowls. They grow very well with only their roots in the water and their leaves growing above the bowl. Brazilian Swords are true terrarium plants rather than aquarium plants and will not survive long if completely submerged.