Floristic value of Nee Soon swamp 
53 
Table 2. The categorisation of plots according to preliminary elevational strata and hydrological 
conditions. 
Elevation (m) Wet plots 
Dry plots 
Phase 1 
Q3, Q4, Q6, Q9, Q10 
Q1,Q2, Q7, Q8 
Phase 2 
0-20 
Q104, Q105, Qlll, Q112 
Q101, Q102, Q107, Q109 
20-40 
Q203a, Q206, Q209, Q220 
Q204, Q208, Q213, Q217 
40-60 
Q301, Q308a, Q311a, Q319a, Q320a 
Q302, Q305, Q306, Q307 
60-80 
Q404a, Q414a 
Q405, Q408 
80-100 
Q504 
Q509 
Total number 
21 
19 
was collected from a measured woody stem, the collection number contained a ‘T’ 
followed by the serial number of the stem (e.g., see Appendix 1). A map of the final 
plot locations (Fig. 1) was printed on the back of the specimen labels of our voucher 
specimens for ease of reference. 
Rediscoveries 
Of the species that were listed as presumed Nationally Extinct in the 2nd edition of 
the Singapore Red Data Book (B.C. Tan et al., 2008; H.T.W. Tan et al., 2008), 61 were 
later “rediscovered”, based on herbarium specimens collected after its publication. 
These 61 rediscoveries were compiled by Chong et al. (2012). We recorded 21 of these 
61 species in our plots (Table 3). We also recorded: Ampelocissus cinnamomea (Wall, 
ex M.A.Lawson) Planch., which was recently rediscovered in the Bukit Timah Nature 
Reserve (Ng et al., 2014), and Globba pendula Roxb. (Zingiberaceae), which was also 
recently reported as rediscovered by Niissalo et al. (2017). Their presence in Nee Soon 
adds a new locality for these two species as the earlier records were all from other parts 
of Singapore. Another species, Plocoglottis lowii Rchb.f. (Orchidaceae), was first 
rediscovered and reported from Upper Seletar Reservoir at a locality just outside of 
the Nee Soon catchment (Niissalo et al., 2016), but the lead author later found another 
population near one of our plots: Q306 (M.A. Niissalo, personal communication). 
Aeschynanthus pulcher (Blume) G.Don ( ^Aeschynanthus parvifolius R.Br.) was also 
reported as rediscovered from the Nee Soon swamp forest by Williams (2014). We 
did not encounter Plocoglottis lowii and Aeschynanthus pulcher ourselves during our 
study. 
We provide brief accounts below of the rediscovery of twelve more presumed 
Nationally Extinct species from our plots, including recent unreported collections by 
others. Collection details are in Appendix 1. 
