A survey of the coastal and inter-tidal areas of the island in 2005 revealed four plants listed as endangered in Singapore, including the Seashore Bat Lily ("Tacca leontopetaloides") which so far has only been recorded in one area of Singapore: Pulau Semakau. Semakau also has vast stretches of Tape seagrass ("Enhalus acoroides") which is considered rare and vulnerable in Singapore. Semakau is also the only known location in Singapore of the seagrass "Syringodium isoetifolium". The seagrass meadow is being monitored by the recently set up 'Team Seagrass'.