It is one of the few remaining habitats for the species typical of the Myristica swamps, notably Syzygium travancoricum, an endangered endemic plant.
Studies conducted by Kerala Forest Research Institute and MS Swaminathan Research Foundation found that the status of its endangered state can be upgraded as new sightings of the specimens are found elsewhere.
Syzygium | Syzygium travancoricum | Syzygium smithii | Syzygium samarangense | Syzygium luehmannii | Syzygium malaccense | Syzygium maire | Syzygium cumini |
Ashtamudi Estuary has mangroves Avicennia officinalis, Brugiera gymnorrhiza and Sonneratia caseolaris as also 43 species of marshy and mangrove associates including two endangered species Syzygium travancoricum (endangered species according to the Red Data Book of Indian Plants) and Calamus rotang in the Terrestrial system.