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Card. Bull. Singapore 69(1) 2017 
The current project 
In the current project we set out to study all herbarium specimens from Papuasia, 
several of which were already known to represent new species (Forster & Liddle, 
1992), and to conduct extensive field surveys in PNG to obtain new collections. 
Herbarium materials were studied at B, BM, BO, CGE, G, K, L, LAE, OXF, P, SAN, 
SAR, SING and Z. Loans from A and US were studied at SING. Forster & Liddle 
(1992) stated that a comprehensive revision of the genus in Papuasia would require 
extensive fieldwork and cultivation of field-collected material that would take many 
years. Cultivation of field-collected materials for the description of new species and 
photo documentation has been successfully adopted by Rintz (1978) and Lamb et 
al. (2014) for Peninsular Malaysia and Sabah Hoy a respectively. Our observations 
in the field confirmed the need to cultivate sterile field-collected specimens as only 
approximately one out of every 300 Hoy a individuals observed were in flower during 
the fieldwork. A revision based only on specimens collected in flower during fieldwork 
would result in the omission of over 99 % of the total plants sighted in the field. 
Therefore, the first author moved to PNG in 2010 to conduct extensive field work in 
all provinces and to cultivate selected collections at two different altitudes to obtain 
flowering material. The plants were grown in Lae, Morobe Province, for low altitude 
species, and in Kainantu, Eastern Highlands Province, at 1500 m altitude, for high 
altitude species. 
By December 2015, 55 field expeditions in 11 provinces (Fig. 1) had been 
carried out and data gathered on locality, habitat, population count and size, presence 
of ants, size of host tree and forest type for more than 4000 Hoy a individuals. A 
selected 1500 specimens have been brought into cultivation (Fig. 2). Once they flower 
they are photographed and made into herbarium specimens. The materials gathered 
will be used for conservation, taxonomic and molecular studies. 
The purpose of the present paper is to describe 10 species and one subspecies 
that have been identified as new among the herbarium specimens, new field collections 
and cultivated collections that have already flowered. We also move Marsdenia 
urniflora PI.Forst into Hoy a. All specimens that could be georeferenced have been 
plotted in Fig. 1. 
Taxonomy 
Hoy a brassii PI.Forst. & Liddle ex Simonsson & Rodda, sp. nov. 
Similar to Hoya globulifera Blume in leaf shape (linear-lanceolate) but distinguished 
by its much shorter petioles (1-2 mm in H. brassi , > 4 mm in H. globulifera ), much 
shorter peduncles (c. 1 mm vs. > 1 cm) and inflorescences with fewer flowers (1-10 
vs. 10-30 flowers). - TYPE: Papua New Guinea, Western Province, Palmer River, 2 
miles below junction with Black River, 100 m., June 1936. Brass, L.J. 6883 (holotype 
A [A00353955], BM [BM001014248], BRI n.v.). (Fig. 3, 4) 
