Family Name: Alismataceae
Scientific Name: Echinodorus horemanni
Common Name: None
Substrate: rich
Lighting: medium
pH value: 6.5-7.5
Hardness: 2-15odH
Temperature: 64-79oF (18-26oC)
Height: Over 24 in (60 cm)
Distribution: Southern Brazil
Characteristics: Leaves short-stemmed, lanceolate, stiff, parchment-like, dark green, slightly undate along the margins.
Aquarium use: Showplant, only for very tall tanks
Might be known as a "Red Rubin sword". Not sure if it's the same, but it's the only sword I know with that color leaf. I did think it may have been an aponogeton (spell??) type but looking closer, I don't think it is. They can look a lot like swords.