116 
Card. Bull. Singapore 69(1) 2017 
scattered along the stems. Leaves often held horizontally, petiolate; petiole terete, 1-3 
x 0.5 mm; lamina elliptic-ovate, coriaceous, 5-10 x 2-3(-4) cm, medium green on 
both surfaces, apex acute to caudate, base round to attenuate; venation pinnate, midrib 
depressed on adaxial surface, secondary veins obscure. Inflorescence one per node, 
extra-axillary, pseudo-umbellate, consisting of 2-5 flowers; peduncle terete, much 
reduced, c. 1 x 1 mm, older peduncles forming a rachis from previous flowerings, 
pedicels terete, 2-3 cm x 0.5-1 mm in diameter, light green, glabrous. Calyx c. 5 mm 
in diameter, calyx lobes ovate, c. 2 x 0.7 mm, apex acute-rounded. Corolla broadly 
campanulate, almost rotate, c. 3 cm in diameter (2 cm when dry), pale pink, translucent; 
tube c. 1 cm (c. 0.5 when dry), lobes broadly triangular, c. 1 x 1.2 cm, thinly pubescent 
inside, almost glabrous near centre, outside glabrous, margins recurved, apex obtuse. 
Corona staminal, c. 2 mm high, c. 8 mm in diameter, fleshy, creamy yellow with 
maroon centre; lobes from above (narrowly) elliptic, c. 4 x 1.8 mm (c. 3 x 1 when 
dry), inner processes acuminate, outer processes rounded (acute), with basal revolute 
margins along the entire length of the corona lobe, not basally fused with filament 
tube. Pollinia oblong c. 330-380 x 120-200 pm, with sterile edge, corpusculum 
oblong with constriction in the middle, 150-200 x 100-150 pm, caudicles attached at 
the lower half of the corpusculum, 70-80 x c. 50 pm. Ovary conical, 2-3 mm long, 
glabrous. Fruit and seed not observed. 
Distribution. The species is only known from the type locality on Crater Mountain and 
from Black River in Western Province. It may be locally endemic as it has not been 
recorded elsewhere, neither in herbaria nor during the first author’s fieldwork. 
Etymology. Named after the late Mrs Evelina Eriksson (1932-2009) of Sweden who 
supported the first author’s work in PNG. 
Habitat and ecology. A climber in riverine forest, often growing on trees or shrubs, or 
even on mossy rocks, near or above streams. Not observed on taller trees or in sunnier 
and drier areas, only in shade or filtered sunlight. Locally common. 
Provisional IUCN conservation assessment. Critically Endangered CR Bla,b(iii) 
(IUCN, 2016). The species co-occurs with Hoy a brassii at the type locality where 
it is locally co mm on However much of PNG Western Province’s lowland rainforest 
has been or is being logged (Shearman et al., 2009). The type locality is not inside a 
protected area and may be lost in the near future. 
Additional specimens examined. PAPUA NEW GUINEA: Western Province: Black River, 
near Dahamo, 1 Mar 2011, Simonsson Juhonewe, N. & Juhonewe, F. NS0005H (LAE, SING) 
(living accession NS 11 -115). 
Notes. In Papuasia the only other species with much reduced peduncles are Hoya 
epedunculata and Hoya brassii. Hoya evelinae can be separated from H. epedunculata 
because it produces peduncles almost at every node when mature, and often has 
numerous inflorescences with simultaneously open flowers, leaves < 8 cm long and 
