Nine species of plants that are casual or have become naturalised are newly recorded for Singapore. Six of these are weeds assumed to have only recently arrived in Singapore: Cuscuta campestris Yunck., Clidemia capitellata (Bonpl.) D.Don, Decalobanthus peltatus (L.) A.R.Simões & Staples, Erigeron bellioides DC., Justicia comata (L.) Lam., Mecardonia procumbens (Mill.) Small. The remaining three have been in Singapore for some time but have been previously overlooked: Pseudelephantopus spicatus (Juss. ex Aubl.) C.F.Baker, Praxelis clematidea R.M.King & H.Rob and Spigelia anthelmia L.
Due to ongoing work for the Flora of Singapore, a new family record for Singapore, the Stemonaceae, with one species, Stemona curtisii Hook.f., is recorded. In addition, Ammannia crassicaulis Guill. & Perr. in the Lythraceae is newly recorded as naturalising in Singapore. Notes on two rare species, Hernandia nymphaeifolia (C.Presl) Kubitzki in the Hernandiaceae and Securidaca philippinensis Chodat in the Polygalaceae, currently being revised for the Flora of Singapore are presented.
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