I found some information on Echinodorus xingu in my Oriental Aquarium Handbook:
Synonym: Echinodorus latifolius
Propagation by runners
Origin: Central America
A hardy species which can produce runners. The leaves in rosettes can reach 20 cm long and 0.9 cm broad. Leaf blade is narrowly lanceolate and erect. E. latifolius resembles E. quadricostatus, but the latter has shorter and broader leaves. This plant can be planted in the middle in bunches or in the front corners of the aquarium.
Carlos
Synonym: Echinodorus latifolius
Propagation by runners
Origin: Central America
A hardy species which can produce runners. The leaves in rosettes can reach 20 cm long and 0.9 cm broad. Leaf blade is narrowly lanceolate and erect. E. latifolius resembles E. quadricostatus, but the latter has shorter and broader leaves. This plant can be planted in the middle in bunches or in the front corners of the aquarium.
Carlos
