[Botany • 2017] Hoya fauziana ssp. angulata (Apocynaceae, Asclepiadoideae) • A New Subspecies from Borneo and Sumatra

Hoya fauziana ssp. angulata Rodda, A.L.Lamb, Gokusing & S.Rahayu

in Rodda, Lamb, et al., 2017. 
DOI: 10.3767/blumea.2018.63.02.10 

Abstract

A new Hoya subspecies from Borneo and Sumatra, Hoya fauziana ssp. angulata is described and illustrated. Both subspecies of Hoya fauziana have long lanceolate leaves, pubescent corollas and prominent ovoid corona lobes. They can be separated by the orientation of the pedicels (straight in H. fauziana ssp. fauziana and angled in H. fauziana ssp. angulata) and the type and position of pubescence of the corolla (tube and lobes pubescent with evident sericeous hairs in H. fauziana ssp. fauziana vs only tube finely pubescent in H. fauziana ssp. angulata).

Keywords: Asclepiadaceae; Hill Dipterocarp Forest; Indonesia; Kalabakan; Kalimantan; Malaysia; Sabah; Southeast Asia; epiphyte

Fig. 2 Hoya fauziana ssp. angulata Rodda,A.L.Lamb, Gokusing & S.Rahayu.
Living plant flowering in cultivation at Kipandi Park, Sabah, Malaysia.

— Photo by Steven Bosuang. 

Fig. 1 Hoya fauziana ssp. angulata Rodda,A.L.Lamb, Gokusing & S.Rahayu.
a. Corolla, top view; b. pedicel and calyx, side view; c. corona, from underneath; d. pedicel and calyx, top view; e. flower and pedicel, side view; f. pollinarium (Gokusing LG56/2017 (SAN)).

— Drawn by Xiang Yun Loh.

Hoya fauziana ssp. angulata Rodda, A.L.Lamb, Gokusing & S.Rahayu, subsp. nov. 

Distinguished from H. fauziana ssp. fauziana by the orientation of the flowers, all facing the same direction (vs perpendicular to the pedicel axis in H. fauziana ssp. fauziana) and by the fine pubescence of the corolla tube (vs long sericeous trichomes on the corolla tube and lobe in H. fauziana ssp. fauziana). 

 Type: L. Gokusing LG56/2017 (holo SAN), Malaysia, Sabah, Tawau, Kalabakan area, Mixed Hill Dipterocarp Forest, 16 May 2017.

M. Rodda, A.L. Lamb, L. Gokusing and S. Rahayu. 2017. Hoya fauziana ssp. angulata (Apocynaceae, Asclepiadoideae), A New Subspecies from Borneo and Sumatra. Blumea - Biodiversity, Evolution and Biogeography of Plants. DOI: 10.3767/blumea.2018.63.02.10

[Botany • 2019] Hoya of Sumatra (Apocynaceae, Asclepiadoideae), An Updated Checklist, Three New Species, and A New Subspecies

 Hoya sumatrana S.Rahayu & Rodda

in Rahayu & Rodda, 2019.

 DOI: 10.5852/ejt.2019.508

Abstract

The list of the species of Hoya R.Br. occurring on the Indonesian island of Sumatra is updated and the type citation is clarified. Sixteen taxa are added to the latest checklist. Hoya danumensis subsp. amarii S.Rahayu & Rodda subsp. nov., H. rigidifolia S.Rahayu & Rodda sp. nov., H. solokensis S.Rahayu & Rodda sp. nov., and H. sumatrana S.Rahayu & Rodda sp. nov. are newly described. Hoya parviflora Wight, H. parvifolia Schltr., and H. purpureofusca Hook. are lectotypified.

Keywords: Apocynaceae; Asclepiadaceae; Asclepiadoideae; Indonesia; Marsdenieae

Checklist of the genus Hoya of Sumatra

Class Magnoliopsida Brongn.

Subclass Asteridae Takht.

Order Gentianales Juss. ex Bercht. & J.Presl

Family Apocynaceae Juss.

Genus Hoya R.Br.

Hoya andalensis Kloppenb.

Hoya beccarii Rodda & Simonsson

Hoya brooksii Ridl.

Hoya campanulata Blume

Hoya caudata Hook.f.

Hoya coriacea Blume

Hoya coronaria Blume

Hoya danumensis subsp. amarii S.Rahayu & Rodda subsp. nov.

Etymology The new species is named after Amar Husein Sitompul, who collected the type specimen.

Notes Hoya danumensis subsp. amarii subsp. nov. can be separated from H. danumensis Rodda & Nyhuus (2009) subsp. danumensis because of the shape and size of the corolla that is shallowly campanulate, 20–23 mm in diameter and deeply campanulate, vs 25–35 mm in the latter; in the shape and size of the corona lobes that are ovate-oblong and 5.5–6 × 2.4–2.6 mm in H. danumensis subsp. danumensis vs ovate and 4.5–5 × 2.3–2.5 mm in the new subspecies.

Hoya deykeae T.Green

Hoya diversifolia Blume

Hoya elliptica Hook.f.

Hoya fauziana subsp. angulata Rodda, A.L.Lamb, Gokusing & S.Rahayu

Blumea 63: 144 (Rodda et al. 2018).  

Hoya finlaysonii Wight

Hoya forbesii King & Gamble

Hoya glabra Schltr.

Hoya imperialis Lindl.

Hoya kastbergii Kloppenb.

Hoya lacunosa Blume

Hoya lasiantha (Korth. ex Blume) Miq.

Hoya latifolia G.Don

Hoya mitrata Kerr nom. cons.

Hoya multiflora Blume

Hoya obtusifolia Wight

Hoya omlorii (Livsh. & Meve) L.Wanntorp & Meve

Hoya parviflora Wight

Hoya parvifolia Schltr.

Hoya purpurascens Teijsm. & Binn.

Hoya purpureofusca Hook.

Hoya revoluta Wight ex Hook.f.

Hoya rhodostele Ridl.

Fig. 2. Inflorescence, pollinarium, and leaf. C, E. Inflorescences. D, G. Pollinaria. F. Leaf.
C–D. Hoya solokensis S.Rahayu & Rodda sp. nov. (Fadly s.n. leg., BO).
E–G. Hoya rigidifolia S.Rahayu & Rodda sp. nov. (S. Rahayu 865 leg., BO).

Photos: Fadly (C), S. Rahayu (E–F), and M. Rodda (D, G).

Hoya rigidifolia S.Rahayu & Rodda sp. nov.

Etymology The new species is named for its rigid and stiff leaves.

Notes Hoya rigidifolia sp. nov. flowers only open for a single day. The flowers of H. finlaysonii are also open for a single day and have a similar flower morphology (rotate corolla, ovoid corona lobes of similar size). Both species are, however, easily separated based on leaf characters. Hoya finlaysonii has lanceolate to oblong leaves with pinnate venation, usually darker than the rest of the lamina; H. rigidifolia sp. nov. also has pinnate venation, but additionally it has two basal secondary veins running along the entire length of the lamina. The leaf venation of H. erythrina Rintz (1978) is similar to that of H. rigidifolia sp. nov.; however, both species can be separated based on flower charaters: H. erythrina has flowers with corolla > 15 mm in diameter when flattened, long-pubescent inside, and lasting > 2 days, while H. rigidifolia sp. nov. has flowers with corolla < 12 mm in diameter when flattened, glabrous inside, and lasting one day.

Hoya rintzii Rodda, Simonsson & S.Rahayu

Hoya rundumensis (T.Green) Rodda & Simonsson

Hoya sarcophylla Ridl.

Hoya scortechinii King & Gamble

Hoya sigillatis T.Green subsp. sigillatis

Hoya solokensis S.Rahayu & Rodda sp. nov.

Etymology The new species is named after the collection locality in Solok, Sumatra.

Notes Hoya solokensis sp. nov. is one of the few species of Hoya that exhibits a non-climbing habit but is instead an epiphytic shrub. It is morphologically similar to H. papaschonii Rodda (Rodda & Ercole 2014), a species only found in southern Thailand. Both species share a shrubby habit, short-lived peduncles, and flowers with a tubular corolla. However, H. papaschonii has the free part of the corolla lobes mostly held upright, while in H. solokensis sp. nov. the lobes are spreading; furthermore, the corona of H. papaschonii has both staminal and interstaminal elements while H. solokensis sp. nov. only has a staminal corona. Another species with a tubular corolla is H. telosmoides Omlor (1996) from Borneo, that is, however, a climber. The flowers of H. solokensis sp. nov. superficially resemble those of the Bornean H. hamiltoniorum A.L.Lamb, Gavrus, Emoi & Gokusing (Lamb et al. 2014) because both species have the free part of the corolla lobes spreading, however H. hamiltoniorum is a climber and its inner apex of the corona lobe is bifid, while the apex of the inner lobes of H. solokensis sp. nov. is entire.

Fig. 3. Hoya sumatrana S.Rahayu & Rodda sp. nov. 
A. Buds. B. Inflorescence, from underneath. C. Flower, from top. D. Corolla, from underneath, calyx and pedicel. E. Flower, side view. F. Corona, from underneath. G. Pedicel, calyx and ovaries. H. Pollinarium. Photos: M. Rodda.

Hoya sumatrana S.Rahayu & Rodda sp. nov

Etymology The new species is named after the Indonesian island of Sumatra.

Notes Hoya sumatrana sp. nov. is a new species in H. sect. Peltostemma Schlechter (1916: 14), characterized by upright corona lobes, long linear anther appendages extending well above the style-head and pollinaria with well developed caudicle wings. This section includes six species, two of which, H. soidaoensis Kidyoo (2013) and H. phuwuaensis Kidyoo (2016), have been recently published. Hoya sumatrana sp. nov. can be separated from all other members of this section because its flowers are much smaller; for example, the corolla of H. sumatrana sp. nov. is 7–9 mm in diameter, while the corolla of the second smallest species, H. flagellata Kerr (1940: tab. 3407), is > 10 mm in diameter, as well as the corona of Hoya sumatrana sp. nov. is 2.8–3.2 mm in diameter, while that of H. flagellata is > 4 mm in diameter. Another useful character to separate H. sumatrana sp. nov. from all other members of the section is the inner corona lobe process, that is bilobed in H. sumatrana sp. nov., while the other species have acute or rounded processes.

Hoya uncinata Teijsm. & Binn.

Hoya vitellinoides Bakh.f.

Hoya vitellina Blume

Hoya wrayi King & Gamble

Discussion: 

Since Rahayu & Wanntorp (2012), the Sumatran specimens identified as H. erythrostemma Kerr (1939) have been identified as H. rintzii, H. micrantha Hook.f. (Hooker 1883) has been re-determined as H. rundumensis, and H. verticillata was reported as H. parasitica Wall. ex Wight (1834). Nine species have been added to the inventory of Sumatran Hoya (Rahayu & Wanntorp 2012), all described based on Sumatran collections. These are H. andalensis, H. beccarii, H. brooksii, H. deykeae, H. omlorii, H. parvifolia, H. purpurascens, H. sarcophylla, and H. uncinata.

Hoya variifolia is considered a new synonym of H. parviflora. Two further species, H. glabra Schltr (Schlechter 1908) and H. kastbergii, are newly recorded.

The total count of taxa of Hoya known from Sumatra now stands at 43 and includes 41 species and two subspecies

Sri Rahayu and Michele Rodda. 2019. Hoya of Sumatra, An Updated Checklist, Three New Species, and A New Subspecies. European Journal of Taxonomy. 508; 1–23. DOI: 10.5852/ejt.2019.508

[Botany • 2019] Hoya pulchra (Apocynaceae) • A New Species from southern Philippines [Hoya of the Philippines part II]

Hoya pulchra Aurigue & Cabactulan

in Cabactulan, Aurigue, Pimentel, De Leon, Sahagun & Rodda, 2019.  

photo: facebook.com/MiguelDeLeon75033149

A new species, Hoya pulchra Aurigue & Cabactulan (Apocynaceae), is described and illustrated. It is compared with the similar H. waymaniae, endemic to Borneo, from which it differs in lamina shape (lanceolate with a flat edge vs. elliptic-ovate with undulate edge) and the absence of bilobed apex in the outer corona lobe apex vs. a short raised bilobed apex.

Derek D. Cabactulan, Fernando Aurigue, Reynold Pimentel, Miguel D. De Leon, Jorge Sahagun and Michele Rodda. 2019. Hoya of the Philippines, part II: Hoya pulchra (Apocynaceae), A New Species from southern Philippines. Ann. Bot. Fennici. 56: 49–53.  

facebook.com/MiguelDeLeon75033149/posts/1078317419017575

[Botany • 2017] Hoya migueldavidii • A New Species (Apocynaceae, Asclepiadoideae) from Northern Mindanao, Philippines [Hoya of the Philippines part I]

Hoya migueldavidii  Cabactulan, Rodda & Pimentel

DOI: 10.3897/phytokeys.80.12872 

Abstract

A new species of Hoya R.Br. from Mindanao (Philippines), Hoya migueldavidii Cabactulan, Rodda & Pimentel, is described and illustrated. It is a member of Hoya section Acanthostemma (Blume) Kloppenb. that is particularly speciose in the Philippines. It is compared with the similar Hoya loheri Kloppenb, also endemic of the Philippines, from which it differs in indumentum of the vegetative parts (pubescent vs. glabrous), the shape of the corolla (almost spherical vs. partly flattened) and the type of gynostegium (not stipitate vs. stipitate)

Keywords: Acanthostemma, Marsdenieae, waxflower

Figure 1: Hoya migueldavidii photographed from R. Pimentel s.n. (CMUH) prior to pressing
A A single flower, front view B, C Corolla, side view D Corolla, with removed corona E Revolute margins of the corolla lobes F Corona, from underneath G, H Pedicel, calyx and ovary I Pollinarium

(Photographs by M.D de Leon)
DOI: 10.3897/phytokeys.80.12872

Figure 2: Hoya migueldavidii photographed from R. Pimentel s.n. (CMUH) prior to pressing
A Inflorescence B Branch C, D leaf (C adaxial surface D abaxial surface). (Photographs by M.D de Leon).

Figure 1: Hoya migueldavidii photographed from R. Pimentel s.n. (CMUH) prior to pressing A A single flower, front view B, C Corolla, side view D Corolla, with removed corona E Revolute margins of the corolla lobes F Corona, from underneath G, H Pedicel, calyx and ovary I Pollinarium (Photographs by M.D de Leon)

Figure 2: Hoya migueldavidii photographed from R. Pimentel s.n. (CMUH) prior to pressing A Inflorescence B Branch C, D leaf (C adaxial surface D abaxial surface). (Photographs by M.D de Leon). 

DOI: 10.3897/phytokeys.80.12872

Hoya migueldavidii Cabactulan, Rodda & Pimentel, sp. nov.

 Diagnosis: Among Philippine Hoya species similar to Hoya loheri in inflorescence type (positively geotropic, convex) but separated because Hoya loheri has a flattened, turban-shaped corolla (vs. almost round in Hoya migueldavidii) and leaves and stems are entirely glabrous (vs. pubescent in Hoya migueldavidii)

Figure 3. Hoya loheri photographed from Rodda M MR748 (SING) prior to pressing A Leafy branch and inflorescence B Inflorescence. (Photographs by M. Rodda) 

Type: Philippines, Mindanao, Bukidnon, Mount Kitanglad, 11 Aug 2016, R. Pimentel s.n. (CMUH, holotype, sheet number CMUH 827; SING, isotype).

Etymology: Hoya migueldavidii is named after Dr. Miguel David de Leon, viteoretina surgeon and plant and wildlife conservationist.

Distribution and ecology: This new species was only once collected in Mindanao Island, Philippines but the full distribution is still unknown. It is an epiphytic climber, growing at about 1000 m in disturbed primary broad leaf forest in full sun to part shade.

Derek D. Cabactulan, Michele Rodda and Reynold Pimentel. 2017. Hoya of the Philippines part I. Hoya migueldavidii (Apocynaceae, Asclepiadoideae), A New Species from Northern Mindanao, Philippines. PhytoKeys. 80; 105-112.    DOI: 10.3897/phytokeys.80.12872

 

[Botany • 2016] Hoya isabelchanae • A New, Showy Species of Hoya R.Br. (Apocynaceae, Asclepiadoideae) with Pomegranate Red Flowers from Sulawesi, Indonesia

Hoya isabelchanae 

 Rodda & Simonsson 

DOI:  10.3897/phytokeys.68.8803

Abstract

A new species of Hoya R.Br. from Sulawesi (Indonesia), Hoya isabelchanae Rodda & Simonsson, is described and illustrated. It is one of the largest flowered species in Hoya section Acanthostemma (Blume) Kloppenb. Its flowers are of comparable size to those of Hoya benchaii Gavrus et al., Hoya kloppenburgii T.Green, Hoya rundumensis (T.Green) Rodda & Simonsson and Hoya sigillatis T.Green ssp. sigillatis, all from Borneo. Among Sulawesi species it is compared with the vegetatively similar Hoya brevialata Kleijn & van Donkelaar and Hoya pallilimba Kleijn & van Donkelaar.

Keywords: Borneo, Cultivation, Gunung Boliohutu, Malesia, Marsdenieae

Hoya isabelchanae Rodda & Simonsson, sp. nov.

Diagnosis: Among Sulawesi Hoya species similar to H. brevialata and H. pallilimba in habit (prostrate and pendant epiphyte), lamina shape (convex round to elliptic) and inflorescence type (positively geotropic, convex) but separated because both H. brevialata and H. pallilimba have smaller flowers (c. 5 vs. 8–10 mm in diameter in H. isabelchanae) with a finely pubescent corolla (vs. setose corolla in H. isabelchanae).

Type: Indonesia, Sulawesi, Gorontalo, Gunung Boliohutu, 400 m, 23 Apr 2002, S.M. Scott 02-116, grown on at the Royal Botanic Garden Edinburgh (Acc no. 20021229), Sep 2012, C.E. Berthold 0013 (holotype: E; isotype: SING)

Etymology: Hoya isabelchanae is named after Isabel Claire Chan Yuen Ching, late daughter of Elisabeth Chan, Singaporean patron of botanical research and a gardener with an interest in Hoya.

Distribution and ecology: Hoya isabelchanae is only known from the base of Gunung Boliohutu, Sulawesi, where it was collected as a sterile cutting in 2002 and brought into cultivation at the Royal Botanic Garden Edinburgh where it regularly blooms in a heated greenhouse from May to October. The species was collected in primary forest and it was growing in shaded but exposed area on a decaying tree 12 m tall. A further collection is widely available in cultivation under Gerard Paul Shirley number GPS10161 and 7-35 http://www.paulshirleysucculents.nl/shop_hoyas.htm [accessed on 24 June 2016]. This accession is apparently also from Sulawesi but no further collection information is available.

 Michele Rodda and Nadhanielle Simonsson Juhonewe. 2016. Hoya isabelchanae Rodda & Simonsson, A New, Showy Species of Hoya R.Br. (Apocynaceae, Asclepiadoideae) with Pomegranate Red Flowers from Sulawesi, Indonesia. PhytoKeys. 68: 45-50. DOI:  10.3897/phytokeys.68.8803

  

[Botany • 2015] Hoya tamdaoensis • A New Species (Apocynaceae, Asclepiadoideae) from Vietnam

FIGURE. 1. Photographs of a living plant of Hoya tamdaoensis Rodda & T.B.Tran cultivated at the Singapore Botanic Gardens (M. Rodda MR729, SING) a. Inflorescence, adaxial view; b. Inflorescence, abaxial view; c. Branch, peduncle, and pendulous inflorescence

Photographs by M. Rodda. || Phytotaxa || DOI: 10.11646/phytotaxa.217.3.6

Abstract

A new species of Hoya R.Br. from Tam Đảo National Park (Vĩnh Phúc Province, Vietnam), Hoya tamdaoensis Rodda & T.B.Tran,is described and illustrated. It is distinguished from the morphologically similar Hoya siamica Craib by corolla size, lamina shape, coloration, and orientation of the petioles.

Keywords: Hoya siamica, limestone, lithophytic, lower montane forest, Marsdenieae, Eudicots, Vietnam

Hoya tamdaoensis Rodda & T.B.Tran spec. nov. (Figs. 1 & 2) Similar to Hoya siamica Craib (1910: 419) in exhibiting inflorescences positively geotropic, convex, flowers numerous, corollas white, pubescent within, and leaves glabrous, but distinguished by the corolla size (1.8–2.2 cm diam. vs. < 1 cm diam. in H. siamica) and the lamina shape (base attenuate-rounded and apex caudate vs. base cuneate or acute and apex acute or acuminate in H. siamica). 

TYPE:— VIETNAM, Vĩnh Phúc prov., Tam Đảo N.P., Máy Giấy trail, 1072 m, 20 September 2011, Nguyễn Quốc Bình, Jana Leong- Škorničková, Trần Hữu Đăng VNM-B1465 (holotype, SING!; isotypes HN!, VNMN!).

Etymology:— The new species is named after the collection locality, Tam Đảo National Park, Vietnam. 

Distribution and ecology:— Only known from the type locality in Tam Đảo National Park, Vietnam. Hoya tamdaoensis was found growing epilithically on limestone covered by moss in evergreen lower montane forest. 

Conservation status:— Known from only one locality; the preliminary conservation status of Hoya tamdaoensis is Data Deficient (DD; IUCN 2014).

Michele Rodda, The Bach Tran and Quoc Binh Nguyen. 2015. Hoya tamdaoensis (Apocynaceae, Asclepiadoideae), A New Species from Vietnam. Phytotaxa. 217(3): 288–292. DOI: 10.11646/phytotaxa.217.3.6

http://mapress.com/phytotaxa/content/2015/f/pt00217p292.pdf

[Botany • 2014] Hoya rintzii • Taxonomic Revision of the Hoya mindorensis complex (Apocynaceae: Asclepiadoideae)

Hoya rintzii 

Rodda, Simonsson & S. Rahayu (2014)

ABSTRACT 

The Hoya mindorensis complex is revised, types for the names involved are selected, and a new classification of the taxa is proposed. Hoya erythrostemma is separated once again from Hoya mindorensis, Hoya elmeri is identified as an earlier name for Hoya mindorensis subsp. superba, and a further new species, Hoya rintzii, from Peninsular Malaysia, Sumatra and Borneo, is described. A key is provided as an aid to identification.

Keywords: Borneo, Hoya elmeri, Hoya erythrostemma, Hoya mindorensis subsp. mendozae, Hoya mindorensis subsp. superba, Hoya rintzii, Indonesia, Malaysia

 Michele Rodda, Nadhanielle Simonsson Juhonewe and Sri Rahayu. 2014. Taxonomic Revision of the Hoya mindorensis complex (Apocynaceae: Asclepiadoideae). Webbia. 69(1). DOI: dx.doi.org/10.1080/00837792.2014.900261

[Botany • 2014] Hoya papaschonii • A New Species (Apocynaceae: Asclepiadoideae) from southern Thailand with A Peculiar Corona

FIGURE 4. Photographs of a living plant of Hoya papaschonii Rodda
cultivated at the Singapore Botanic Gardens (acc. no. 20132440):
a. Flowering branch and paired fruits; b. Bud; c. Flower, lateral view; d. Flower with two corolla lobes removed, showing the position of the corona basally enveloped by the corolla lobes; e. Flower, longitudinal section; i. Corona, lateral view; j. Corona, top view; k. Flower, longitudinal section with the position of the guide rail highlighted in black; l. Anther and anther appendages (after removal of one staminal corona lobe).

Photographs by M. Rodda. The parts of the gynostegium are labelled as: A = Anther; Aa = Anther appendage; C(is) = interstaminal corona lobe; Cs = Staminal corona lobe; G = Guide rail; Re = Retinaculum; S = Stigma; Sh = Stigma head.

Abstract

The new Hoya species, here described and fully illustrated, is an epiphytic shrub with white-cream coloured flowers superficially similar to those of Hoya telosmoides. Its gynostegial corona includes five staminal and five interstaminal lobes, the latter never before observed in Hoya. The placement of the new species within Hoya was confirmed by a phylogenetic analysis based on nuclear ribosomal ITS and 5’-ETS regions, and chloroplast psbA-trnH and trnT-trnL intergenic spacers. It belongs to a group of species including Hoya multiflora and Hoya praetorii, characterised together with H. papaschonii by non-climbing habit, thin leaves lacking basal colleters, and short-lived peduncles.

Keywords: Hoya sect. Centrostemma, Hoya sect. Cystidianthus, Hoya sect. Plocostemma, ITS, 5’-ETS, psbA-trnH, trnT-trnL 

Hoya papaschonii Rodda

Similar in habit to Hoya multiflora, and in corolla morphology to Hoya telosmoides but the gynostegial corona presents a unique combination of both staminal and interstaminal lobes.

Type:—THAILAND. Original collection in Yala: Betong, cultivated in Thailand, Ratchaburi Province, Ratchaburi, November 2012, Papaschon Chamwomg KEW2012-011 (holotype BKF, isotypes BCU, K, SING).

Etymology:— The new species is named after the collector and Hoya enthusiast Mr. Papaschon Chamwong who, in 2012, sent a specimen of the new species to Singapore Botanic Gardens for identification.

Distribution and ecology:— Hoya papaschonii is only known from two collections in Betong District, Yala Province in southern Thailand. It was collected in evergreen forest, where it was growing epiphytically. 

Conservation status:— Known only from two collections from Yala Province in Thailand. The distribution area, the population size and the possible threats to the habitat are unknown. We therefore consider H. papaschonii as Data Deficient (DD) (IUCN 2014).

Michele Rodda and Enrico Ercole. 2014. Hoya papaschonii (Apocynaceae: Asclepiadoideae), A New Species from southern Thailand with A Peculiar Corona. Phytotaxa. 175(2): 097–106. 

DOI: dx.doi.org/10.11646/phytotaxa.175.2.4