Hoya of Papuasia I. 
137 
Hoy a urniflora (P.I.Forst) Simonsson & Rodda, comb. nov. - Marsdenia urniflora 
RI.Forst., Austral. Syst. Bot. 8: 752 (1995). - TYPE: Papua New Guinea, Oro Province, 
Lala River, c. 5500 ft. [c. 1675 m], 28 December 1935, Carr, C.E. 14065 (lectotype 
SING [SING0122003], designated here; isolectotypes BM [BM001014154], K, L, 
SING [SING122001, SING122002]). (Fig. 12, 21, 22). 
Similar to Hoya juhoneweana because both have sunken leaf venation and a bullate 
leaf surface. Hoya juhoneweana has corollas >2.5 cm wide whereas H. urniflora have 
corollas c. 1.5 cm wide. 
Epiphytic climber with white exudate latex in all vegetative parts. Stems cylindrical, 
1.5-3 mm in diameter, sparsely to densely hispid; internodes 3-25 cm long. Leaves 
petiolate; petiole terete, 4-8 x 1-2 mm in diameter, hirsute; lamina lanceolate, stiff and 
chartaceous, (1.5—)3—10 x 1—2.5 cm, hirsute on the abaxial surface, adaxial surface very 
hispid when young, almost glabrous on old leaves, apex long acuminate, base attenuate 
to acute with single, ovoid basal colleters; venation pinnate, midrib and secondary 
veins depressed on adaxial surface, raised on abaxial surface, secondary veins slightly 
visible, 2-5 each side, branching from the midrib at 45-80°, anastomosing along the 
lamina edge. Inflorescences one per node, extra-axillary, convex, consisting of (l-)5- 
10 widely spaced flowers, peduncle perennial, terete, 0.4-2(-3) cm x 1.5-2 mm, older 
peduncles forming a rachis from previous flowerings, hirsute; pedicels terete, 1.5-2 
cm x c. 1 mm in diameter, hirsute. Calyx 3^4 mm in diameter, calyx lobes oblong, 
1-2 x 1-1.5 mm, apex round, thinly pubescent outside; colleters one in each calyx 
lobe sinus, c. 50 pm long. Corolla base narrowly campanulate, terminating in free 
spreading lobes, 14-16 mm wide; tube 5-6 x 5-6 mm, sparsely pubescent inside, more 
thickly pubescent at the throat, outside glabrous, lobes triangular, 5-9 x 3.5-4.5 mm, 
velvety, outside glabrous, apex acute. Corona staminal 4.5-5.5 mm high, 4.5-5.5 mm 
wide, fleshy; corona lobes erect, almost completely fused to the back of the anthers, 
c. 4 x 1.5-2 mm, inner processes acute with a round tip, outer processes round, with 
basal revolute margins. Style-head conical, hidden by anther appendages. Pollinia 
oblong 400-500 x 150-200 pm, without sterile edge, corpusculum ovoid, 350—400 x 
230-300 pm, caudicles attached at the base of the corpusculum, 130-170 x c. 50 pm. 
Ovary conical, c. 2 mm long. Fruits and seeds not observed. 
Distribution. First collected by Carr in 1935 ( Carr 14065 ) along the Kokoda Track 
over the Owen Stanley Range along the border of Central and Oro Provinces, where he 
also collected Hoya carrii. In 1970 a specimen ( Streimann & Kairo NGF42473) was 
collected 260 km NW in southern Morobe province on the Central Range. The species 
was collected again in 2011 at the easternmost end of the Finisterre Range on Huon 
Peninsula, 290 km N of the first collection and 190 km NE of the second collection 
(N. S. Juhonewe & F. Juhonewe NS0069L, NS0096L, NS0098L, NS0099L, NS0100L, 
NS0101L, NS0102L). This suggests a widespread distribution, although the taxon may 
still be rare and very scattered since it has only been encountered at one locality during 
the first author’s expeditions. 
