Ludwigia glandulosa from North America is a very beautiful water plant.
It is slow growing and requires CO2 addition to grow well. Stems becomes 15-40 cm tall and 5-12 cm wide. The leaves turn greener and the lower ones may fall off if sufficient light is not provided.
The plants you receive may, or may not be in this submerged form. New shipment of plants may be in their emerse form which is green in color and looks different in shape.