Sungei Mandai Besar.
The expansive meadows of the Critically Endangered Beccari's seagrass (Halophila beccarii) here seem to be lush and thick throughout.
Perepat (Sonneratia alba). I noticed a similar situation along Kranji Nature Trail, with Perepat saplings dotting the Beccari's seagrass meadows there.
Api-api putih (Avicennia alba) with a few large Perepat (Sonneratia alba).
compilation of links provided by N. Sivasothi.
Nipah palm (Nypa fruticans).
Lokan (Geloina sp. aka Polymesoda sp.)? The clam that Dr Tan Koh Siang says is so well adapted to being out of water that you can keep one in your drawer for a month (see the video clip of Dr Tan sharing about this clam during the Mega Marine Survey at Admiralty Park).
Maiden's jealousy (Tristellateia australasiae), but a closer look and I think they are Caesalpinia crista! This probably means the yellow flowers I saw at Punggol mangroves a few days ago were also Caesalpina crista.
a few weeks ago. Here's more about the plant on The Total Vascular Flora of Singapore Online.
Mangrove Trumpet tree (Dolichandrone spathacea)? I couldn't quite tell if it was a tall tree or a short one, due to the prickly thicket. This tree is listed as Critically Endangered.
Dungun (Heritiera littoralis). The tree is listed as Endangered.
Teruntum (Lumnitzera sp.) and several small Portia trees (Thespesia polpunea), most of which were rather chewed up.