The forests within and around Singapore’s last substantial tract of intact freshwater swampNee Soon Swamp Forestare extremely diverse floristically and so present challenges in the recognition of plant species. Here we provide two keys and species descriptions, based on characters easily observed in the field, to the 22 species of Lauraceae found there. Two of these are new additions to Singapore’s flora: Cryptocarya nitens (Blume) Koord. & Valeton and Litsea resinosa Blume. This is the first in a series of articles that aim to assist in the identification of the trees of the Nee Soon Swamp Forest

The forests within and around Singapore’s last substantial tract of intact freshwater swamp forest—Nee Soon Swamp Forest—are extremely diverse floristically, and so present challenges in the recognition of plant species. Here we provide a key and species descriptions, based on characters easily observed in the field and on dried specimens, to the Hypericacae of the Nee Soon Swamp Forest. Only the genus Cratoxylum is native to Singapore, with four species, all trees, found in the Nee Soon Swamp Forest. A fifth species, Cratoxylum glaucum, seems to have been erroneously recorded as native to Singapore, but we could find no evidence that it has been collected from here. Cratoxylum glaucum has only been recorded from Peninsular Malaysia, Borneo, and other parts of Indonesia, according to taxonomic accounts for the region, and its natural distribution is not known to include Singapore.

This paper is the third instalment of a continuing series on the tree species of the floristically diverse Nee Soon Swamp Forest, Singapore’s last substantial tract of intact freshwater swamp forest. Here, for the Myristicaceae, we provide a key and descriptions, based on characters easily observed in the field and when dried of Gymnacranthera (three species), Horsfieldia (seven species, with two varieties for Horsfieldia polyspherula), Knema (10 species, with two varieties for Knema curtisii), and Myristica (five species). Horsfieldia tomentosa is unlikely to occur in Singapore based on recent accounts. Horsfieldia grandis and Horsfieldia superba are new records for the Nee Soon Swamp Forest.

This paper is the fourth part of a continuing series on the tree species of the floristically diverse Nee Soon Swamp Forest, Singapore’s last substantial tract of intact freshwater swamp forest. We provide a key and descriptions for six species of Xanthophyllum from the family Polygalaceae, based on characters easily observed in the field and of dried specimens.