(Buch.-Ham. ex Roxb.) Koehne
Ammania rotundifolia Hamilton
The emerse form has rounded leaves, the submerse leaves are narrow lanceolate. It is very variable dependent on light and environmental conditions. Under strong light, the leaves can become almost wine red. It has pale pink flowers. This plant can be differentiated from the closely related R. indica by the differences in the two species' inflorescences. R. rotundifolia bears groups of terminal inflorescence, while R. indica has solitary flowers on the axis of the leaves.
A common aquarium plant, it is undemanding, but requires light to thrive. R. rotundifolia can withstand relatively cool temperatures. Losing its lower leaves usually means it is not receiving enough light. It can be grown emerse in shallow water, where it will flower. It is propagated by cuttings which form as side shoots.
- Cook. C.D.K. 1976. A revision of the genus Rotala. Boissiera 29:1-156.