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Card. Bull. Singapore 69(1) 2017 
from the midrib at 50-80°; basal colleters two, light brown. Inflorescence one per 
node, extra-axillary, positively geotropic, pseudo-umbelliform, convex, consisting of 
7-20 flowers; peduncle persistent, terete, slender, 4-15 cm x 1-1.5 mm, glabrous, 
older peduncles forming a rachis from previous flowerings; pedicels terete, 2-A cm 
x c. 1 mm in diameter, light green to purplish red, glabrous. Flower buds cream 
coloured, flushed pink on parts exposed to the sun. Flowers lasting about one week in 
cultivation, with a weak scent during the day, more intense at night. Calyx 4-10 mm 
in diameter, calyx lobes triangular to lanceolate, 1.5-5 x c. 1.5 mm, glabrous, apex 
rounded to acute, margin glabrous or ciliate. Corolla spreading, 16-22 mm in diameter 
(19-25 mm when flattened), cream to pale yellow, flushed pink on the outer surface 
in specimens growing in bright light; tube 5-7 mm, lobes triangular, slightly fleshy, 
6- 9 x 5-7 mm, inside thickly and densely covered with 0.5-1 mm long hairs, outside 
glabrous, margins recurved, apex acute, recurved. Corona staminal, 2.5-3.5 mm high, 
7- 9 mm in diameter, fleshy, yellow, somewhat translucent; lobes ovate-elliptic, 3^.5 
x 2-2.5 mm, inner processes cuspidate, slightly erect, not meeting (or just barely) 
in the centre, outer processes apex rounded to obtuse (acute), slightly erect, c. 1 mm 
higher than inner processes, carinate above, with basal revolute margins. Style-head 
convex, hidden by anther appendages. Pollinia oblong, c. 500 x 200 pm, with sterile 
edge, corpusculum ovate 200-250 x 100-120 pm, caudicles attached in the middle of 
corpusculum, c. 70 x 30 pm. Ovary broadly conical c. 2 mm long; each carpel c. 1 mm 
wide at the base, light green-yellow, glabrous. Fruits cylindric and tapering, c. 20 x 1 
cm (unripe), dark green becoming red-pigmented in sunlight, seeds not seen mature. 
Distribution. The species is recorded from the Kuper Range (holotype Kairo 405) and 
from three additional collections by the first author in Morobe Province (Fig. 1). 
Etymology. Named after the siblings Charlize, Diesel and Evelize Edholm of Sweden, 
supporters of the first author’s work in PNG. 
Habitat and ecology. Hoya edholmiana was rather abundant at the three localities 
where it was observed by the first author. It was recorded only at altitudes between 
c. 1450 and 1850 m. It was absent both further down and further up the mountain 
during the extensive expeditions, even on the same slope. It is usually an epiphyte 
but on shaded or partially exposed ridges was also found growing as a lithophyte on 
mossy rocks, entangled amongst other plants. Where it occurs, it is common in the 
primary forests and can occasionally be found in adjacent mature secondary forests. 
It thrives on younger trees along disturbed paths but is absent in the surrounding sun- 
exposed and drier subsistence gardens, where instead H. magnifica P.I.Forst. & Liddle, 
H. subglabra Schltr. and Hoya sp. sect. Eriostemma were recorded. The specimens 
brought into cultivation flower abundantly throughout the year. 
Provisional IUCN conservation assessment. Least Concern (IUCN, 2016). It appears 
to be rather common and somewhat capable of re-colonising moist secondary forests. 
It has only been recorded in Morobe Province. 
