Gardens' Bulletin Singapore 69(2): 157-165. 2017 
doi: 10.26492/gbs69(2).2017-01 
157 
Hanguana podzolicola (Hanguanaceae), 
a new record for Singapore 
v 
M.A. Niissalo 1 & J. Leong-Skornickova 2 
Molecular Biology & Micropropagation, Research & Conservation Branch, 
Singapore Botanic Gardens, National Parks Board, 
1 Cluny Road, 259569, Singapore 
matti. niis salo @ gmail .com 
2 Herbarium, Research & Conservation Branch, 
Singapore Botanic Gardens, National Parks Board, 
1 Cluny Road, 259569, Singapore 
j ana_skornicko va@nparks. gov. sg 
ABSTRACT. Hanguana podzolicola (Hanguanaceae) is newly recorded for Singapore. 
Detailed colour plates are given alongside the main characters for distinguishing this species 
from the two most similar species in Singapore, Hanguana rubinea and H. triangulata. The 
seeds of Hanguana podzolicola are described for the first time. A local conservation assessment 
is given. As no original material of Hanguana podzolicola could be traced, a neotype is 
designated here. Following a recent clarification of several historical Hanguana names it is 
noted here that the correct name for the large helophytic stoloniferous species often cultivated 
in Singapore under the name Hanguana malayana is Hanguana anthelminthic a. An updated 
key to Hanguana species in Singapore is provided. 
Keywords. Central Catchment Nature Reserve, Hanguana anthelminthic a, H. malayana, H. 
pantiensis, IUCN conservation assessment, Johor, neotypification, Peninsular Malaysia 
Introduction 
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In a recent overview of Hanguana Blume in Singapore, Leong-Skornickova & Boyce 
(2015) recognised four native, one introduced, and one cultivated species. Since the 
publication of this paper, fieldwork on Hanguanaceae has continued and a survey of 
all populations of Hanguana, along with a systematic survey of the primary forest 
habitats of Zingiberales in Singapore, has been undertaken (Niissalo et al., 2017). 
During these surveys we found a population of a species that has not been previously 
reported from Singapore. 
We have compared our material to all seven Hanguana species so far described 
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from Peninsular Malaysia (Jack, 1820; Siti Nurfazilah et al., 2010; Leong-Skornickova 
& Kiew, 2016). The plants in Singapore are similar to two species described from Johor, 
Hanguana podzolicola Siti Nurfazilah et al. and H. pantiensis Siti Nurfazilah et al., in 
their leaf characters, small fruits and strongly obliquely positioned stigmas, although, 
of these two, the spreading, long inflorescence branches of the Singaporean plant 
