Ludwigia glandulosa

Ludwigia glandulosa from North America is a very beautiful aquatic plant.
It is slow-growing and requires added CO2 to thrive. The stems reach 15-40 cm in height and 5-12 cm in width. The leaves become greener, and the lower leaves may fall off if there is insufficient light.
It used to be sold as Ludwigia perennis.