Lepironia articulata (Retz.) Domin, a monotypic, semi-aquatic sedge, was presumed nationally extinct in Singapore. However, it was recently encountered and rediscovered in the Western Catchment, and assigned the national conservation status of Critically Endangered.

We discovered a population of Plocoglottis lowii Rchb.f., last collected in 1909 and previously listed as Presumed Nationally Extinct, growing in a wet primary forest in Singapore. The historic distribution of the species is reported here, and the national conservation status of the species is assessed. We also provide notes on the genus in Singapore and the pollination biology of Plocoglottis lowii involving a remarkable trapping mechanism.

Vrydagzynea lancifolia Ridl. was presumed to be nationally extinct until the rediscovery of a single individual in Bukit Timah Nature Reserve on 29 Oct.2013. Three inflorescences were observed on a single plant, but there was no fruit set. There were no other individuals found in the vicinity. Conservation is necessary to ensure the continued survival of this species in Singapore. A conservation status of critically endangered is proposed for this species.

Callostylis pulchella (Lindl.) S.C.Chen & Z.H.Tsi, previously thought to be extinct in Singapore, was recently rediscovered in the Nee Soon Swamp Forest. As such, it has recently been assigned the new national conservation status of critically endangered as it is currently only known from one locality in the Republic.