There are so many echinodorus i realy wouldn't know, but refering to it's common name Sword plant i guess this has developed from it's submersed form. I've yet not found a picture of a echi resambling a sword in it emersed form. Most submersed pictures on the net you might want to ask when was it taken and it might be a picture from a echi not yet transitioned to it submersed form.
But maybe an Anubias gracilis is something for you, i believe there are few bigger anubias var. growing like that.. But the gracilis stands out the most with it's arrow shaped leaves.. 🙂