[Botany • 2019] Jasminanthes laotica (Apocynaceae, Asclepiadoideae) • The First New Species of Jasminanthes described from Laos

Jasminanthes laotica Y.H. Tan & H.B. Ding

in Ding, Yang, Zeng & Tan, 2019.

 DOI: 10.11646/phytotaxa.393.3.7

(Photographed by H.B. Ding and Y.H. Tan).

Abstract

Jasminanthes laotica (Apocynaceae, Asclepiadoideae), a new species from northern Laos is described, illustrated and a diagnostic key to the species of Jasminanthes Blume is given in this paper. J. laotica is allied to J. xuanlienensis T.B. Tran & Rodda, but can be distinguished by its longer sepals, obtuse to subcordate lamina base, and bright yellow of the inner corolla lobes, salmon-pink of the outer corolla lobes.

Keywords: Marsdenieae, New record genus, Nam Ha National Bio-Diversity Park, Taxonomy, Eudicots

FIGURE 1. Jasminanthes laotica Y.H. Tan & H.B. Ding.
 A. Flowering branch; B. Inflorescence, underside view; C. Leaves branch in the habitat of the type locality (25 March 2018); D. Leaves; E. Inflorescence, side view; F. Gynostegium and staminal corona; G. Pollinarium; H. Flower, side view; I. Unopened flower, side view; J. Longitudinal section of flower; K. Corolla, inner view; L. Flower exclude corolla and two calyx sepals; M. Pedicel, three calyx sepals and ovary; N. Calycinal colleters

(Photographed by H.B. Ding and Y.H. Tan).

Jasminanthes laotica Y.H. Tan & H.B. Ding, sp. nov.

Ding Hong Bo, Yang Bin, Xiao-Dong Zeng and Yunhong Tan. 2019. Jasminanthes laotica (Apocynaceae, Asclepiadoideae), The First New Species of Jasminanthes described from Laos. Phytotaxa. 393(3); 297-300. DOI: 10.11646/phytotaxa.393.3.7

Researchgate.net/publication/331274655_Jasminanthes_laotica_the_first_new_species_of_Jasminanthes_described_from_Laos

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[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] Marsdenia yarlungzangboensis (Apocynaceae: Asclepiodoideae) • A New Species from Xizang, China

Marsdenia yarlungzangboensis C.Liu, J.D.Ya & Y.H.Tan

in Liu, Ya, Tan, et al, 2019. 

 DOI: 10.3897/phytokeys.130.34152

Abstract

Marsdenia yarlungzangboensis (Apocynaceae, Asclepiadoideae), a new species from Motuo County, southeastern Xizang of China, is described and illustrated. It is morphologically similar to M. medogensis, M. tenii and M. yuei, the major differences between the new species and the morphological relatives are outlined and discussed. A diagnostic key to the new species and its closely related species in China is provided.

Keywords: Marsdenia, Marsdenia yarlungzangboensis, new species, China

Figure 1. Marsdenia yarlungzangboensis C.Liu, J.D.Ya & Y.H.Tan
A habit B flower (lateral view) C opened calyx D opened corolla E gynostegium and staminal corona F pistil G pollinarium. 

Figure 2. Marsdenia yarlungzangboensis C.Liu, J.D.Ya & Y.H.Tan 
A habit B inflorescences and adaxial leaf surface C abaxial leaf surface D flower (lateral view) E flower (front view, showing hairy throat) F opened corolla G opened calyx H gynostegium and staminal corona I pistil J pollinarium. 

Photos: Cheng Liu (A–E) and Lian-Yi Li (F–J).

Marsdenia yarlungzangboensis C.Liu, J.D.Ya & Y.H.Tan, sp. nov.

Diagnosis: Marsdenia yarlungzangboensis is morphologically similar to M. medogensis, M. tenii and M. yuei, but differs from M. medogensis in inflorescences pubescent; sepals suborbicular; corolla yellow, throat red and densely pilose, shorter lobes and reddish outside, apex emarginate, margin reddish and ciliate; corona lobes triangular, to base of anthers; stigma head hemispherical; and differs from M. tenii in leaf blades elliptic; sepals suborbicular; corolla yellow, throat red, lobes reddish outside, margin reddish; stigma head hemispherical, conspicuously exserted from anther appendages and corolla tube; and also differs from M. yuei in leaf blades elliptic; inflorescences unbranched and pubescent; sepals suborbicular; corolla yellow, throat red and densely pilose; lobes ovate, apex emarginate; corona lobes to base of anthers.

....

Distribution and habitat: Marsdenia yarlungzangboensis grows at the margins of subtropical evergreen broad-leaved forest with main community types of Castanopsis echinocarpa J. D. Hooker & Thomson ex Miquel and Quercus gambleana A. Camus, Renqinbeng, Motuo County, Xizang, China, at an elevation of 1800–2100 m.

Etymology: The specific epithet ‘yarlungzangboensis’ is derived from the type locality, Yarlung Zangbo Grand Canyon, Motuo County, southeast Xizang, China.

Vernacular name: Yǎ Lǔ Zàng Bù Niú Nǎi Cài (Chinese pronunciation); 雅鲁藏布牛奶菜 (Chinese name).

 Cheng Liu, Ji-Dong Ya, Yun-Hong Tan, Hua-Jie He, Gui-Jun Dong and De-Zhu Li. 2019. Marsdenia yarlungzangboensis (Apocynaceae, Asclepiadoideae), A New Species from Xizang, China. PhytoKeys. 130: 85-92. DOI: 10.3897/phytokeys.130.34152

[Botany • 2019] Heterostemma ficoides (Apocynaceae: Asclepiodoideae) • A New Species with Fig-like Flowers from Northern Thailand

Heterostemma ficoides A.Kidyoo

in A. Kidyoo, 2019.

   DOI: 10.1007/s12225-019-9815-4 

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Heterostemma ficoides A.Kidyoo, a new species of Heterostemma sect. Oianthus with a fig-like flower discovered in northern Thailand is here described. Photographs, line illustrations and detailed comparison with the similar species, H. vasudevanii Swarupan. & Mangaly are provided. Heterostemma ficoides resembles H. vasudevanii in having a fleshy globose flower and the presence of the inner corona appendages, but clearly differs in leaf shape, leaf venation, presence of dense hairs on the outer and inner surfaces of the corolla, and apex of the staminal corona lobes. An identification key to the species of sect. Oianthus is presented.

Keywords: Ceropegieae, evergreen forest, inner corona appendages, sect. Oianthus

Fig. 2 Heterostemma ficoides. A habitat; B flowering branch; C inflorescence; D fruit; E longitudinal section of flower; F cross section of flower; G top view of gynostegium. Photos: Aroonrat Kidyoo.

Heterostemma ficoides A. Kidyoo sp. nov. 

Etymology. The specific epithet ‘ficoides’ alludes to the striking similarity of its flower to a fig of Ficus species.

Aroonrat Kidyoo. 2019. Heterostemma ficoides (Apocynaceae: Asclepiadoideae), A New Species with Fig-like Flowers from Northern Thailand. Kew Bulletin. DOI: 10.1007/s12225-019-9815-4

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[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 • 2018] Ceropegia foetidiflora (Asclepiodoideae, Apocynaceae) • A New Species from northeastern Thailand

Ceropegia foetidiflora Kidyoo

in Kidyoo, 2018. 

    DOI: 10.6165/tai.2018.63.327

ABSTRACT

 A newly discovered species from northeastern Thailand, Ceropegia foetidiflora Kidyoo, is here described and illustrated. Photographs and diagnostic comparison with the morphologically similar species, C. thorelii Costantin, are provided. These two species display clear difference in hairiness on the surfaces of the corolla tube and the corolla lobes, and shape of the corolla lobes. 

KEY WORDS: Apocynaceae, Asclepiadoideae, Northeastern Thailand, Open sandy area, Strong musty smell. 

Fig. 1. Illustrations of Ceropegia foetidiflora sp. nov. (a) habit, (b) flower bud, (c) longitudinal section of flower showing corona and gynostegium, (d) top view of gynostegium, (e) pollinarium, (f) fruit, (g) seed.

Drawn by Manit Kidyoo from M. Kidyoo 1557 (a)–(e) and M. Kidyoo 1616 (f)–(g).

Fig. 2. Vegetative and reproductive parts of Ceropegia foetidiflora sp. nov. 

Ceropegia foetidiflora Kidyoo, sp. nov. 

Ceropegia foetidiflora is distinguished from C. thorelii by its corolla tube which is glabrous outside, lanceolate-oblong corolla lobes that are nearly as long as the tube and densely pubescent on the adaxial surface and glabrous on the abaxial surface. Contrarily, C. thorelii bears pubescent corolla tube, ovate-lanceolate corolla lobes that are shorter than the tube and hairy on the midrib of the adaxial surface and pubescent on the abaxial surface as well as margins. 

Type: THAILAND. Phu Langka National Park, Bueng Kan Province, 520 m a.s.l., 14 August 2012, M. Kidyoo 1557 (holotype: BKF, isotype: BCU). 

Habitat, ecology and distribution: Ceropegia foetidiflora occurs about 520 m a.s.l. in Phu Langka National Park, Bueng Kan Province, northeastern Thailand (Fig. 3). It is perennial herb growing in sandy soil, open areas of dry deciduous dipterocarp forest. Flowering July–October. 

Fig. 2. Vegetative and reproductive parts of Ceropegia foetidiflora sp. nov. (a–c) compared with those of C. thorelii (d–e): (a) habit; (b), (d) flower; (c), (e) side view of gynostegium.

Photograph by Manit Kidyoo.

Manit Kidyoo. 2018. Ceropegia foetidiflora sp. nov. (Asclepiodoideae, Apocynaceae), A New Species from northeastern Thailand. Taiwania. 63(4); 327-332.   DOI: 10.6165/tai.2018.63.327

[Botany • 2018] Brachystelma ananthapuramense (Apocynaceae: Asclepiadoideae) • A New Species from Andhra Pradesh, India

Brachystelma ananthapuramense K. Prasad, A. Naray. & Meve

in Prasad, Swamy & Meve, 2018.

DOI: 10.1007/s12225-018-9740-y 

Photos by K. Prasad & A. N. Swamy.  facebook.com/KewBulletin 

Summary

A new species of Brachystelma from the Southern Deccan plateau of Gorantla hills, Andhra Pradesh is described and illustrated. This taxon, named Brachystelma ananthapuramense, is morphologically similar to the B. kolarense complex but differs by its small habit, short internodes, large flowers with more than 1.5 cm long corolla lobes, globular cage and densely pubescent corona. A key to the B. kolarense complex, including the proposed new species in India is provided.

Keywords: Ananthapuramu, Ceropegieae, Gorantla hills, Southern Deccan plateau

Fig. 1. Brachystelma ananthapuramense. 
A habit; B flowering plant; C flower bud; D flowers; E tuber; F & G calyx lobes; H – K details of corona; L pollinia; M gynostegium; N follicles; P seeds.

Photos: K. Prasad & A. N. Swamy.

Fig. 2. Brachystelma ananthapuramense.
 A habit; B flower bud; C calyx lobe; D flower; E flower without hairs; F corona top view; G corona side view; H pollinia; J gynostegium.

Drawn BY K. Prasad.

Brachystelma ananthapuramense K. Prasad, A. Naray. & Meve, sp. nov. 

Type: India, Andhra Pradesh, Ananthapuramu distr., Gorantla hills, 800 m, 8 June 2014, A. N. Swamy & K. Prasad 44922 (holotype CAL!; isotype SKU!).

Recognition: Brachystelma ananthapuramense is closely allied to B. naorojii P. Tetali et al., but differs by having a much smaller habit, 4 – 5 cm (vs 30 – 55 cm in B. naorojii), corolla lobes uniformly linear, 1.5 – 2.5 cm long (vs triangular at base, c. 1 cm long in B. narojii), cage globular (vs cage conical in B. narojii) and staminal corona lobes pubescent and not exceeding the coronal cup (vs staminal corona lobes glabrous and exceeding the coronal cup in B. naorojii). 

....

Etymology: The new species is named after the type locality Ananthapuramu, which is a part of the Southern Deccan plateau of Andhra Pradesh.

K. Prasad, A. Narayana Swamy and U. Meve. 2018. Brachystelma ananthapuramense (Apocynaceae: Asclepiadoideae), A New Species from Andhra Pradesh, India. Kew Bulletin. 73(1); DOI: 10.1007/s12225-018-9740-y  
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[Botany • 2018] Hoya phuluangensis • A New Species of Hoya (Marsdenieae), Three New Combinations and Two New Names in Vincetoxicum (Asclepiadeae) from Thailand

Hoya phuluangensis  Kidyoo  

in Kidyoo & Kidyoo, 2018. 

 DOI:  10.6165/tai.2018.63.25 

Abstract

Hoya phuluangensis Kidyoo, a new species from northeastern Thailand is here described and compared to the similar species, H. rostellata and H. siamica. All three species have glabrous stems and branches, glabrous coriaceous leaves, adaxially puberulent ovate corolla lobes with an acute apex, and flat to slightly erect coronal scales with an obtuse or rounded apex. However, H. phuluangensis differs from the other two species in the following characters: flowers with a shallow cup-shaped corolla tube and a corona diameter measuring less than half of the corolla tube diameter. Full description of H. phuluangensis is provided, together with line drawings and photographs. In addition, three new combinations and two new names in the genus Vincetoxicum, namely V. indicum (Burm.f.) Mabb. var. glabrum (Decne.) A. Kidyoo, V. kerrii (Craib) A. Kidyoo, V. sootepense (Craib) A. Kidyoo, V. lindleyi A. Kidyoo and V. potamophilum A. Kidyoo, are proposed.

Keyword: Apocynaceae, Asclepiadoideae, Hill evergreen, Hoya phuluangensis, Thailand, Vincetoxicum

Fig. 2. Photographs of Hoya phuluangensis Kidyoo.
 A: Habitat. B: Flowering branch. C: Inflorescence. D: Flower, top view. E. Flower, side view.

All photographs by M. Kidyoo.

Hoya phuluangensis is distinguished from H. rostellata by a flower with corolla lobes not reflexed when in full bloom and with slightly revolute margins, shallow cup-shaped corolla tube, and corona diameter less than half of the corolla tube diameter. In contrast, H. rostellata has corolla lobes with strongly revolute margins and apex, corolla tube spreading in a flat form, and corona of diameter more than half of the corolla tube diameter.

Ecology and distribution: This plant usually grows in shady areas in hill evergreen forest from 1,400 m a.s.l., climbing on tree trunks and branches.  

 Etymology: The specific epithet of the new species is derived from ‘Phu Luang Wildlife Sanctuary’, the place where it was first discovered. 

Fig. 3. Comparison between A & D: Hoya phuluangensis Kidyoo, B & E: H. rostellata Kidyoo, and C & F: H. siamica Craib. A – C: Flower, D – F: Leaf.

All photographs by M. Kidyoo.

Aroonrat Kidyoo and Manit Kidyoo. 2018. A New Species of Hoya (Marsdenieae), Three New Combinations and Two New Names in Vincetoxicum (Asclepiadeae) from Thailand. Taiwania. 63(1); 25-31.  DOI:  10.6165/tai.2018.63.25

http://tai2.ntu.edu.tw/taiwania/pdf/tai.2018.63.25.pdf

 tai2.ntu.edu.tw/taiwania/abstract.php?type=abstract&id=1538

 facebook.com/TaiwaniaOffice/photos/2007703416118144

[Botany • 2018] Dregea taynguyenensis • A New Species (Apocynaceae, Asclepiadoideae) from Vietnam

Dregea taynguyenensis T.B. Tran & Rodda

in Tran, Van, Thu, Choi, Eum & Rodda, 2018

DOI: 10.11646/phytotaxa.333.2.11 

Abstract

The new species Dregea taynguyenensis from Vietnam is described, illustrated and compared with the other Dregea species occurring in Vietnam and neighbouring countries D. cuneifolia, D. sinensis, D. volubilis and D. yunnanensis. Dregea taynguyenensis differs from these species by the leaf blade secondary veins number, calyx lobes shape, and corolla lobes size.

Keywords: Asclepiadaceae, Marsdenieae, Southeast Asia, Wattakaka, Eudicots

Dregea taynguyenensis T.B. Tran & Rodda, spec. nov. 

Dregea taynguyenensis is most similar to D. cuneifolia due to the elliptic-oblong leaf blades, cuneate at base and acuminate at apex. The former is distinguished from the latter by having 7–10 secondary veins each side of midrib (vs. 5–6 in D. cuneifolia), calyx lobes lanceolate to linear (vs. ovate) and corolla lobes 10.2–12.6 × 5.3–6.4 mm (vs. c. 4 × 4 mm).

....

Etymology:— The specific epithet refers to the type locality, Tay Nguyen area in Vietnam.. 

Distribution and ecology:— Dregea taynguyenensis is only found in Vietnam, Gia Lai province, Tay Nguyen area where it grows in sunny places in secondary forest, in association with Bidens pilosa Linnaeus (1753: 832), Jasminum lanceolarium Roxburg (1820: 97), Maclurodendron oligophlebium (Merrill 1923: 246) T.G. Hartley (1982: 13), Mallotus paniculatus (Lamarck in Lamarck & Poiret 1786: 207) Müller Argoviensis (1865: 34), Melicope pteleifolia (Champion ex Bentham in Bentham 1851: 330) T.G. Hartley (1993: 521). 

FIGURE 1. Dregea taynguyenensis. Flowering branch in the habitat of the type locality. Photograph by T.B. Tran (9 June 2011).
FIGURE 2. Dregea taynguyenensis. A, Leaf blade, abaxial side (left), adaxial side (right); B, Inflorescence with flower buds; C, Flowering branch; D, Inflorescence with greenish flowers; E, Inflorescence with flowers yellowish flushed purple. Based on T.B. Tran et al. Bach 0906201101 (HN), photographs by T.B. Tran (9 June 2011). 

DOI: 10.11646/phytotaxa.333.2.11

The Bach Tran, Hai Do Van, Ha Bui Thu, Sangho Choi, Sangmi Eum and Michele Rodda. 2018. Dregea taynguyenensis (Apocynaceae, Asclepiadoideae), A New Species from Vietnam. Phytotaxa. 333(2); 267–273. DOI: 10.11646/phytotaxa.333.2.11

[Botany • 2017] A Revision of Hoya (Apocynaceae: Asclepiadoideae) of Papuasia. Part I: Ten New Species, One New Subspecies and One New Combination

Hoya edholmiana, H. evelinae, H. krusenstierniana & H. carrii

Simonsson & Rodda 

 SBG.org.sg  

ABSTRACT

 The large majority of Hoya R.Br. species known from Papuasia were described in the first half of the 20th century and most of these are endemic. Along with Borneo and the Philippines the region is a centre of diversity of the genus. Since 2006 herbarium materials have been studied for a revision of Hoya of New Guinea along with field investigations on Papuasian Hoya since 2010. In the present paper we publish ten new species, Hoya brassii P.I.Forst. & Liddle ex Simonsson & Rodda, H. carrii P.I.Forst. & Liddle ex Simonsson & Rodda, H. edholmiana Simonsson & Rodda, H. evelinae Simonsson & Rodda, H. juhoneweana Simonsson & Rodda, H. krusenstierniana Simonsson & Rodda, H. koteka Simonsson & Rodda, H. stenakei Simonsson & Rodda, H. versteegii Simonsson & Rodda and H. yvesrocheri Simonsson & Rodda, one subspecies, H. juhoneweana ssp. lindforsiana Simonsson & Rodda, and make one new combination, H. urniflora (P.I.Forst.) Simonsson & Rodda, which is also lectotypified. 

Keywords: Indonesia, Marsdenieae, Papua New Guinea

Hoya brassii P.I.Forst. & Liddle ex Simonsson & Rodda, sp. nov.

Etymology. Named after Leonard John Brass (1900–1971), an Australian botanist who collected the type specimen in 1936 on the Fly River Expedition of the American Museum of National History (the second Archbold New Guinea Expedition).


Hoya carrii P.I.Forst. & Liddle ex Simonsson & Rodda sp. nov.

Etymology. Named after C. E. Carr (1892–1936), who first collected the taxon in 1935, and again in 1936, on a collecting expedition supported by the British Museum, London, which started in 1934. He died of malaria in June 1936, just a few months after discovering the second locality of Hoya carrii.


Hoya edholmiana Simonsson & Rodda, sp. nov. 

 Etymology. Named after the siblings Charlize, Diesel and Evelize Edholm of Sweden, supporters of the first author’s work in PNG.


Hoya evelinae Simonsson & Rodda, sp. nov.

Etymology. Named after the late Mrs Evelina Eriksson (1932–2009) of Sweden who supported the first author’s work in PNG.

Hoya juhoneweana Simonsson & Rodda, sp. nov. 
subsp. juhoneweana 

Etymology. Named after the first author’s colleague, Foreting Juhonewe, who is also from Hoboc village. He has been of great importance for this research. He has eagerly tried to find more of this rare and diminishing Hoya and promoted its conservation in situ amongst his clan’s people.

Hoya juhoneweana subsp. lindforsiana Simonsson & Rodda, subsp. nov. 

Etymology. Named after Constantinus Lindfors in Sweden, a supporter of the first author’s work in PNG.


Hoya krusenstierniana Simonsson & Rodda, sp. nov. 

Etymology. Named after the Krusenstiern family, supporters of the first author’s work in PNG.


Hoya koteka Simonsson & Rodda, sp. nov. 

Etymology. Named after its elongated style-head that resembles the traditional koteka, or penis-gourd traditionally worn by male natives of New Guinea.


Hoya stenakei Simonsson & Rodda, sp. nov. 

Etymology. Named after the late Mr Sten-Åke Svensson (1947 – 2011) of Sweden, whose children supported the first author’s work in PNG.
   

Hoya versteegii Simonsson & Rodda, sp. nov.

Etymology. Named after its collector, G. Versteeg (1876–1943).


Hoya yvesrocheri Simonsson & Rodda, sp. nov. 

Etymology. Named after the Yves Rocher Foundation which supported the first author’s Hoya Project for five years during 2011–2015.

N. Simonsson Juhonewe and M. Rodda. 2017. Contribution to A Revision of Hoya (Apocynaceae: Asclepiadoideae) of Papuasia. Part I: Ten New Species, One New Subspecies and One New Combination. Gardens’ Bulletin Singapore. 69(1); 97–147.  

https://www.sbg.org.sg/images/4_4_Research_Gardens_Bulletin/4_4_69_1_pdf_Vol_69_Part_1_2017/69_1_97_y2017_V69P1_GBS_pg97.pdf

[Botany • 2016] Schizoglossum austromontanum • A Novel New Species (Apocynaceae, Asclepiadoideae, Asclepiadeae) from South Africa

Schizoglossum austromontanum  Bester & Nicholas

DOI:  10.11646/phytotaxa.273.1.4

Abstract

A new species from southern Africa namely Schizoglossum austromontanum is described. Line-drawings, scans of the type material, images and a conservation assessment are provided.

Keywords: Drakensberg Alpine Center, Eastern Cape Province, flora, taxonomy, Eudicots, South Africa

 Stoffel P. Bester and Ashley Nicholas. 2016.  Schizoglossum austromontanum, A Novel New Species from South Africa (Apocynaceae, Asclepiadoideae, Asclepiadeae).
Phytotaxa. 273(1); 43-50.  DOI:  10.11646/phytotaxa.273.1.4

[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