Hoya bhutanica Grierson & Long 1979

Type description:

In Notes from the Royal Botanical Garden, Edinburgh 37:2 (1979) 353. Hoya bhutanica Grierson & Long species nova affinis H. parasitica (Roxb.) Wall. ex Wight sed foliis ellipticus et minus carnosis, corollis saltem bis latioribus intus puberulis differt. Plate 4.
            Frutex reptans, caules graciles 3-5 m. radicantes. Folia elliptica, (6.5-)9-15 x (2.75-)3-4.5 cm., apice acuta basi rotundata, trinervia, veins lateralibus in dimidio superiore productis, tenuiter coriacea, glabra, marginibus integris. Inflorescentiae axillares umbelliformes multiflorae, pedunculis 1 - 2 cm., pedicillis congestis 2.5 - 3 cm. Segmenta calycis anguste triangularia c. 3 mm. longa, parce pubescentia. Corolla rotata c. 2 cm. diametro alba, extus glabra intus puberula; corona purpurea segmentis ovoideis c. 5 mm x 2.5 mm, horizontaliter radiantibus, leviter complanatis, angulis exterioribus acutis. Fructus ignotus.
S. Bhutan: Hastisar, 460 m, 27iii 1949, “Creeper 10-15 ft. Perianth white; purple eye. In dense forest”. Ludlow, Sherriff & Hicks 18506 (holo. BM).
            Although known only from a single specimen, this appears to be distinct from all other Indian, Chinese and Malayan species. In a note on the type specimen Ludlow compared it with H. pendula Wight but this species has longer, more coriaceous leaves which are cuneate at the base and with clearly pinnate venation. In fact the basically trinerved leaves of this species exclude it from comparison with most others known from SE Asia.

Translation:  Hoya bhutanica Grierson and Long species new like Hoya parasitica
Roxburg (Wallich) ex Wight but different. Leaves elliptic and not fleshy, corolla at least twice wider inside. Creeping shrub stem narrow 3-5 meters, rooting. Leaves elliptic (6.5) 9-15 x (2.75) 3-4.5 cm., apex acute base rounded, trinerved, lateral veins produced ½ above, slightly leathery, glabrous, margined entire. Inflorescence axillary with many flowered umbels, peduncle 1-2 cm, pedicels crowded 2.5 to 3 cm. Segments of the calyx narrow triangular about 3 mm long, sparsely pubescent. Corolla rotate lightly folded back upon itself exterior angle acute. Fruit not seen.