I am not expert on Echinodorus, but i think you have be a little patient here. My swords sent out long stalks from the base of the plant that has nodes on it and at each node at least one little plantlet forms. Then when are developed enough to replant and I cut the stalk off and cut the little plantlets free and plant them. The flowers you have are probably just the start of the process. So be pateint and see if a long stalk comes out of the plant. I hope this helps.
75 gallon heavily planted, 350w MH, 60/40 flourite/gravel, DIY CO2(for now), XP3, Mag350 w/inline DIY CO2 reactor, and fluval surface skimmer. 45 gallon pent corner heavily planted 175w MH, 80/20 Profile/Flourite, DIY CO2, XP3, DIY in-tank foam prefiltered power CO2 reactor. A few other tanks, and way too many plants.