142 
Card. Bull. Singapore 69(1) 2017 
Fig. 23. Hoya versteegii Simonsson & Rodda. A. Corolla sliced longitudinally showing the 
position of the corona. B. Corona, side view. C. Corona, from underneath. D. Calyx and 
ovaries. E. Pollinarium. All based on Versteeg, G. 1236. (Drawing: M. Rodda) 
Notes. The flowers of Hoya versteegii , with their infundibuliform corolla and a long 
narrow tube, may at first be confused with those of other genera, e.g. Marsdenia s.l. 
The gynostegium is instead typical of Hoya as the corona lobes have revolute margins, 
albeit much reduced, and the pollinia have a narrow sterile edge. Among other Hoya 
species, only H. telosmoides Omlor from Borneo and H. papaschonii Rodda from 
Thailand have a tubular corolla, but in both cases they are not continuously narrow as 
in H. versteegii. Additionally the corolla tube of Hoya versteegii is 12-15 mm long 
white that of H. telosmoides and H. papaschonii is less than 10 mm long. Both species 
have much thinner leaves, chartaceous when dry, while Hoya versteegii has stiff and 
coriaceous leaves. 
Hoya yvesrocheri Simonsson & Rodda, sp. nov. 
Similar to Hoya stenophylla Schltr. by having linear leaves but differs in the wider 
leaves and flowers not developing simultaneously, as usually observed in most Hoya 
species, but rather with only one or rarely two flowers open at a time. - TYPE: Papua 
