Hoya of Papuasia I. 
141 
develops climbing stems. When in flower, the two taxa are easily distinguished, as 
Hoy a juhoneweana has corollas >2.5 cm wide whereas the corollas of H. urniflora are 
c. 1.5 cm wide (Fig. 12). 
Hoya versteegii Simonsson & Rodda, sp. nov. 
Similar to numerous other Hoya species with elliptic and succulent leaves but differing 
from all other Hoya species in the infundibuliform corolla with a continuously narrow 
tube. - TYPE: Indonesia, Papua Province, Voer Gelukshauvel, s. dat., Versteeg, G. 
1236 (holotype BO). (Fig. 23) 
Climber , presence of latex unknown. Stems cylindrical, 1.5-4 mm in diameter, 
sparsely pubescent; intemodes 4-15 cm long. Leaves petiolate; petiole terete, 
channelled above, 10-15 x 3-5 mm in diameter, pubescent; lamina elliptic, fleshy, stiff 
and coriaceous when dry, 8-15 x 3-6 cm, pubescent on the abaxial surface, adaxial 
surface glabrous to sparsely pubescent, apex acuminate-apiculate, base round with no 
colleters on old leaves; venation pinnate, midrib depressed on adaxial surface, raised 
on adaxial surface, secondary veins almost invisible, 3-5 each side, branching from 
the midrib at c. 45°. Inflorescences one per node, extra-axillary, convex, consisting of 
3 or more flowers, peduncle perennial, terete, 5-10 cm x 1.5-2 mm, older peduncles 
forming a rachis, glabrous or sparsely pubescent; pedicels terete, 2.5-3 cm x c. 0.8 
mm in diameter, glabrous. Calyx 3-3.5 mm in diameter, calyx lobes oblong, 1-2 x 
0.7-1 mm, apex round, thinly pubescent outside, basal colleters one in each calyx 
lobe sinus, lanceolate, c. 50 pm long. Corolla infundibuliform, with free spreading 
lobes, c. 2.5 cm in diameter when flattened; tube 12-15 mm x c. 3 mm . sparsely 
pubescent inside, more densely pubescent at throat, lobes broadly ovate, 7-10 x 9-12, 
apex acuminate, glabrous. Corona staminal, stipitate, stipe 1-1.5 mm high, c. 1.5 
mm wide; corona c. 3 mm high, c. 3 mm in diameter, fleshy; corona lobes carinate, 
almost completely fused to the back of the anthers, c. 3 x 1 mm, inner processes 
acute with a round tip, outer processes round, with basal revolute margins. Style-head 
hidden by anther appendages. Pollinia oblong, 500-600 x 280-320 pm with pellucid 
margin, corpusculum rhomboid, c. 400 x 250 pm, caudicles attached at the base of 
corpusculum, 100-150 x 30^40 pm. Ovary linear, c. 2.5 mm long, glabrous. Fruits 
and seeds not observed. 
Distribution. Recorded from a single locality in Papua Province, Indonesia, Voer 
Gelukshauvel. 
Etymology. Named after its collector, G. Versteeg (1876-1943). 
Provisional IUCN conservation assessment. Data Deficient (IUCN, 2016). This 
species is known only from the type specimen collected in the early 20th century. 
