Blunt Arrowhead (Limnophyton obtusifolium)

Common native marsh plant grows in tanks and ponds, mainly in the dry lowlands. Flowering from February to April and August to September. 

Mexican sword-plant (Aquarius palifolius [Syn: Echinodorus palifolius])

An introduced marsh herb cultivated, escaped and probably naturalized along pond margins, marshy areas and ditches around Colombo*. Mexican sword-plant is a popular aquarium plant native to South America.

*Naturalized populations observed at Thalangama tank, Kotte marshes and Bellanwila-Attidiya sanctuary.