[Botany • 2022] Hoya longlingensis & H. sichuanensis (Apocynaceae: Asclepiadoideae) • Two New Species from Southwestern China

Hoya longlingensis E.F. Huang,

Hoya sichuanensis E.F. Huang, 

in E.-F. Huang, Tang, Z-F Zhang, J.-X. Huang, Ou et X.-C. Zhang, 2022. 

 DOI: 10.3390/taxonomy2010008 

Abstract

Hoya longlingensis (E.F. Huang) and H. sichuanensis E.F. Huang are two new species of Apocynaceae from Southwestern China that are described in this study. Morphologically, the two species resemble H. tamdaoensis Rodda & T.B. Tran and H. lyi H. Lév., respectively. However, H. longlingensis differs from H. tamdaoensis by its elliptic leaves, mid-vein of leaf blades raised adaxially and depressed abaxially, lateral veins 2–4-paired, corolla yellow-green, outer angles of corona convex and spreading outside obviously. While H. sichuanensis differs from H. lyi by its obovate leaves, leaf apex rounded and base cuneate, petioles 1–3.5 cm long and ca. 3 mm in diameter, calyx lobes triangular, and corona whitish.  

Keywords: Apocynaceae; Asclepiodoideae; China; Hoya longlingensis; H. sichuanensis; Marsdenieae

 Hoya longlingensis E.F. Huang.
 (A) Habit; (B) Leaves; (C,D) Inflorescence; (E) Flower (top view); (F) Flower (bottom view); (G) Corona (top view); (H) Pollinarium; (I) Corona (side view); (J) Pedicel, calxy, and ovaries; (K,L) Ovaries.  

Hoya sichuanensis E.F. Huang.
 (A,B) Habit; (C) Leaves; (D,E) Inflorescence; (F) Flower (top view); (G) Flower (bottom view); (H) Pedicel, calxy, and ovaries; (I) Calyx lobe; (J) Corona (left: top view; right: side view); (K) Pollinarium; (L) Ovaries.

Er-Feng Huang, Li-Ming Tang, Zhi-Feng Zhang, Jiu-Xiang Huang, Zhen-Fei Ou and Xian-Chun Zhang. 2022. Hoya longlingensis and H. sichuanensis (Apocynaceae), Two New Species from Southwestern China. Taxonomy. 2(1); 99-106. DOI: 10.3390/taxonomy2010008 

 

[Botany • 2026] Hoya nagaensis (Apocynaceae: Asclepiadoideae) • A New Species from Phek District, Nagaland, Northeast India

Hoya nagaensis Koza, Pegu & G.Yam, 

in Koza, Pegu et Yam. 2026. 

DOI: doi.org/10.1007/s12225-025-10359-9

Summary

Hoya nagaensis (Apocynaceae, Asclepiadoideae), a new species from the state of Nagaland, India is here described and illustrated. The new species has close morphological affinity with H. thomsonii and H. coronaria. It can be clearly distinguished by its densely hairy corolla lobes, both internally and externally; irregular pinkish to reddish-purple spots on the external corolla surface and, though less pronounced, on the inner surface and narrowly elliptic-lanceolate leaves, with smooth surfaces and long acuminate tips. A detailed morphological description, habitat information, preliminary conservation assessment, notes and comparison with closely related species, H. coronaria, H. carnosa, H. spectatissima, H. bella and H. thomsonii are provided.

Key Words: Eastern Himalaya, epiphyte, Kavünhou Community Reserved Forest, temperate forest 

 

Hoya nagaensis 
 in Kavünhou CRF, Khezhakeno, Phek, India.

Hoya nagaensis Koza, Pegu & G.Yam sp. nov. 

Etymology. The specific epithet “nagaensis” is dedicated to “Nagaland”, where the new species was discovered. The name honours both the cultural and ecological significance of the locality, reflecting the close relationship between the Naga community and the surrounding forest ecosystem.

 

Vieneite-o Koza, Joynath Pegu and Gyati Yam. 2026. Hoya nagaensis (Apocynaceae: Asclepiadoideae) — A New Species from Phek District, Nagaland, Northeast India. Kew Bulletin. DOI: doi.org/10.1007/s12225-025-10359-9  [08 January 2026]

[Botany • 2025] Hoya thuhae (Apocynaceae: Asclepiadoideae) • A New Species from central Vietnam and H. lobbii, new record for Vietnam

Hoya thuhae Aver., Vuong & V.C.Nguyen⁣, 

in Tran, V. C. Nguyen, Averyanov, Wook, Truong, V. K. Nguyen, Maisak et Shvanova, 2025.  

turczaninowia.asu.ru/article/view/18531 

facebook.com: Nguyễn Văn Cảnh

Abstract

A new species, Hoya thuhae (Apocynaceae, Asclepiadoideae), from lowland areas of central Vietnam, is described. It resembles H. kerrii but may be distinguished by its finely pubescent petioles, puberulous leaf blade, longer peduncle, longer pilose to strigose pedicels, different shape of the calyx lobes, and elliptic corolla segments with apices raised above the central portion. Additionally, H. lobbii, known earlier in NE India, Thailand, and Cambodia, is recorded for Vietnam at first. Data on the ecology, phenology, distribution, and conservation status for both species are provided, together with plates compiled from original color analytical photos.

Keywords: flora of Vietnam, Hoya kerrii, plant diversity, plant taxonomy

Thi T. N. Tran, Van C. Nguyen, Leonid V. Averyanov, Um S. Wook, Ba V. Truong, Van K. Nguyen, Tatyana V. Maisak and Valeria V. Shvanova. 2025. Hoya thuhae (Apocynaceae, Asclepiadoideae), A New Species and H. lobbii, new record for Vietnam.  Turczaninowia. 28(4); 144–150. DOI: 10.14258/turczaninowia.28.4.17 [2025-12-25] 

turczaninowia.asu.ru/article/view/18531 

 facebook.com/canhorchid/posts/10229724189551490

 

[Botany • 2025] Hoya biruensis (Apocynaceae: Asclepiadoideae) • A New night-blooming Species of Hoya from Borneo

Hoya biruensis Rodda & S.Rahayu,

in Rodda et Rahayu, 2025. 

DOI: doi.org/10.1002/njb.04787  

  facebook.com/MicheleRodda

illustration by Eunike Nugroho www.instagram.com/inikeke

Abstract

In the present paper, we describe Hoya biruensis, a new species from Borneo, Indonesia, West Kalimantan. It is characterised by a shrubby epiphytic pendulous habit, linear leaves, exceptionally long green peduncles produced at almost every node, and single, night-blooming flowers. We compare it to two morphologically similar species, H. spartioides and H. retrorsa, which are also endemic to Borneo.

Keywords: epiphyte, Hoya retrorsa, Hoya spartioides Indonesia, West Kalimantan

Hoya biruensis Rodda & S.Rahayu, sp. nov. 

illustration by Eunike Nugroho 

www.instagram.com/inikeke

 

Hoya biruensis Rodda & S.Rahayu, sp. nov.  

Michele Rodda and Sri Rahayu. 2025. A New night-blooming Species of Hoya (Apocynaceae: Asclepiadoideae) from Borneo. Nordic Journal of Botany. DOI: doi.org/10.1002/njb.04787 [17 April 2025]

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[Botany • 2024] Hoya sungwookii (Apocynaceae: Asclepiadoideae) • A New Species from southern Vietnam

Hoya sungwookii  Aver., Vuong, Nhan et V. C. Nguyen,

in Tran, V.C. Nguyen, Averyanov, Truong, Dang, V.K. Nguyen, Maisak, Q.B. Nguyen et Krupkina, 2024. 

turczaninowia.asu.ru/article/view/15065

Photos by Van Canh Nguyen and Ba Vuong Truong

Abstract

A new species, Hoya sungwookii, discovered in southern Vietnam near Nha Trang Town (Khanh Hoa Province) is described and illustrated. It belongs to the type section of the genus and is distinguished from the morphologically closest H. oblongacutifolia (= H. graveolens) in glabrous pedicels, smaller flower 1.1–1.4 cm across, greenish ciliate calyx, corolla abaxially light green, small green to dark green corona 4.5–5 mm in diameter, 1.6–1.8 mm tall, small, 2–2.2 mm long, corona segments, and short corona segment inner angle, not exceeding anthers. Additionally, data on ecology, phenology, distribution of newly described species are presented, as well as its evaluated conservation status and color illustrations. Taking into consideration our new data, the genus in Vietnam currently includes 45 species.

Keywords: Asclepioideae, Eastern Indochina, endemism, flora, Hoya oblongacutifolia, Hoya sect. Hoya, Khanh Hoa Province, plant conservation, plant diversity, plant taxonomy

Hoya sungwookii:
A – plant in natural habitat in locus classicus; B – fresh flattened flowering plant; C – flattened shoot of plant in cultivation; D – intact inflorescences; E – spotted and uniform green leaves, adaxial and abaxial side; F – separated inflorescence; G – separated flowers, side view; H – pedicels with calyx and ovary; I – calyx and ovary; J – flower, frontal view; K – corolla, view from below; L–N – corona, views from above, from side, and from below; O – sagittal section of corona and ovary.

Photos by Van Canh Nguyen and Ba Vuong Truong from plant used for the preparation of the holotype specimen VNM 00070356, photo correction and design by L. Averyanov and T. Maisak.

Hoya sungwookii Aver., Vuong, Nhan et V. C. Nguyen, sp. nov.  

Diagnosis. The new species is morphologically closest to Hoya oblongacutifolia, from which it differs in glabrous pedicels, smaller flower 1.1–1.4 cm across, greenish ciliate calyx, corolla abaxially light green, small green to dark green corona 4.5–5 mm in diameter, 1.6–1.8 mm tall, small corona segments, 2–2.2 mm long, and short corona segment inner angle, not exceeding anthers

Etymology. The species is named after Mr. Um Sung Wook, who first found this plant in nature and kindly shared his discovery for our study.

 

T. T. N. Tran, V. C. Nguyen, Leonid V. Averyanov, B. V. Truong, V. S. Dang, V. K. Nguyen, Tatyana V. Maisak, Q. B. Nguyen and Lyudmila I. Krupkina. 2024. New Species, Hoya sungwookii (Apocynaceae, Asclepiadoideae), from southern Vietnam. Turczaninowia. 27(1); 72-80. DOI: 10.14258/turczaninowia.27.1.10 http://turczaninowia.asu.ru/article/view/15065

 Researchgate.net/publication/381368990_Hoya_sungwookii_from_southern_Vietnam

[Botany • 2023] Hoya honglenae (Apocynaceae: Asclepiadoideaea) • A New Species, and the First Report of H. acuminata and H. phuwuaensis in the Flora of Vietnam

Hoya honglenae Aver., Vuong, Bao & V.C. Nguyen, 

in V.C. Nguyen, Averyanov, Q.B. Nguyen, Dang, V.K. Nguyen, Maisak et Truong, 2023.

DOI: 10.11646/phytotaxa.632.1.5

 facebook.com/HongLen

Abstract

Three species of the genus Hoya (Apocynaceae, Asclepiadoideae) are newly reported for the flora of Vietnam. One species, Hoya honglenae, is described and illustrated as new to science, and two species, H. acuminata and H. phuwuaensis, are reported as new national records known earlier, respectively, in Bhutan, Bangladesh, NE India, W China, Myanmar; and NE Thailand. The new species discovered in Phu Quoc Island (Kien Giang Province) morphologically is most close to H. phuwuaensis, but differs in the entire, straight leaf margin, leaves sparsely white speckled adaxially and dirty purple speckled abaxially, smaller yellow flowers, conoid, obtuse, distally up-cured outer angle of corona lobes, and much longer anther appendages. The paper provides morphological descriptions, data on habitat, phenology, distribution, estimated conservation status, taxonomic notes, a list of studied specimens, and color illustrations for all studied species. Taking into consideration our new data, the genus in Vietnam currently includes 44 species.

 

Eudicots, endemism, Hoya sect. Peltostemma, Hoya sect. Pterostelma, Hoya caudata, Hoya soidaoensis, Kien Giang Province, Phu Quoc Island, plant conservation, plant diversity, plant taxonomy

 Hoya honglenae Aver., Vuong, Bao & V.C. Nguyen

  

Van Canh Nguyen, Leonid V. Averyanov, Quoc Bao Nguyen, Van Son Dang, Van Khuong Nguyen, Tatiana V. Maisak and Ba Vuong Truong. 2023. A New Species, Hoya honglenae and the First Report of H. acuminata and H. phuwuaensis (Apocynaceae, Asclepiadoideae) in the Flora of Vietnam. Phytotaxa. 632(1); 60-68. DOI: 10.11646/phytotaxa.632.1.5

 facebook.com/HongLen/posts/10222180428812061

[Botany • 2023] Hoya spectatissima (Apocynaceae: Asclepiadoideae) • A New Species from Yunnan, China

Hoya spectatissima  B.Xue, E.F.Huang, Gang Yao & J.X.Huang,

in Xue, Huang, Yao, Zhao et Huang, 2023. 

DOI: 10.3897/phytokeys.222.99420

 

Abstract

Hoya spectatissima, a new species from Yunnan Province, China, is described and illustrated. Hoya spectatissima is morphologically similar to H. lyi, but can be easily distinguished from the latter by its succulent leaves that are 2‒4.5 cm long (vs. coriaceous leaves that are up to 9 cm long), corolla that is pink to pale pink (vs. yellowish-white) and corona lobes that are sub-rhombic in top view (vs. ovoid in top view).

Keywords: Asclepiadoideae, Asia, Marsdenieae, morphology, nomenclature, taxonomy

Hoya spectatissima  B.Xue, E.F.Huang, Gang Yao & J.X.Huang,
A habit B cross section of lamina C leaves D, E inflorescence F flower (top view) G flower (bottom view) H corona (top view; Red arrowheads indicate the inner angle of the corona lobes and yellow arrowheads indicate the outer angle of the corona lobes) I corona (side view) J ovaries K pollinarium.

 Hoya spectatissima B.Xue, E.F.Huang, Gang Yao & J.X.Huang, sp. nov.

 

Diagnosis: Hoya spectatissima is most similar to H. lyi H.Lév, but differs from the latter by its succulent leaves (vs. coriaceous leaves) that are 2‒4.5 cm in length (vs. up to 9 cm in length) and rounded or rarely obtuse at the apex (vs. mostly acute at the apex), pink to pale pink corolla (vs. yellowish-white corolla) that is densely sericeous adaxially (vs. densely pubescent adaxially), ivory white corona lobes (vs. purple towards the inner angle and ivory white towards the outer angle of corona lobes) that are sub-rhombic in top view (vs. ovoid in top view) and have an acute outer angle (vs. truncate to shallowly concave outer angle).

Distribution and habit: Hoya spectatissima is known from at least two localities in Cangyuan Hsien and Gengma Hsien, Yunnan Province, China. It is a lithophytic liana that climbs on rocks in karst habitat. It is a common species in Guanlong Village, Gengma Hsien, but an occasional species in Menglai Town, Cangyuan Hsien.

Etymology: Hoya spectatissima is named to reflect its beautiful flowers.

Bine Xue, Erfeng Huang, Gang Yao, Guohua Zhao and Jiuxiang Huang. 2023. Hoya spectatissima (Gentianales, Apocynaceae), A New Species from Yunnan, China. PhytoKeys. 222: 69-74. DOI: 10.3897/phytokeys.222.99420

2023年3月国产新种速递 https://www.bilibili.com/read/cv22792971/

[Botany • 2019] Hoya tengchongensis (Apocynaceae: Asclepiadoideae) • A New Species from Yunnan, China

 

 Hoya tengchongensis J.F.Zhang, N.H.Xia & Y.F.Kuang, 

in Zhang Xia & Kuang, 2019. 

DOI:  10.1111/njb.02282 

 Researchgate.net/publication/332327324

Abstract

Hoya tengchongensis, a new species of Apocynaceae, subfamily Asclepiadoideae from Yunnan, China, is described and illustrated. The new species is morphologically similar to Hoya serpens in its creeping habit, bearing small and suborbicular leaves, and adaxially tomentose corolla. However, H. tengchongensis differs from H. serpens in corolla size (ca 7 mm versus ca 12 mm in diam) and corona morphology (corona lobes slightly ascending versus erect).

Keywords: Hengduan Mountains, Hoya serpens

 Line drawing of  Hoya tengchongensis sp. nov. J.F.Zhang, N.H.Xia & Y.F.Kuang.
(A) branch with inflorescences, (B) corolla (adaxial and abaxial sides), (C) corona (adaxial and abaxial sides), (D) calyx and ovary, (E) ovary, (F) pollinarium.

Drawn by Dinghan Cui from a living plant of the type collection at the greenhouse of South China Botanical Garden, Chinese Academy of Sciences.

 Hoya tengchongensis sp. nov. J.F.Zhang, N.H.Xia & Y.F.Kuang.
(A) stems and cauline leaves, (B) leaves, (C) inflorescence, (D) corolla (adaxial and abaxial sides), (E) corona (adaxial and abaxial sides), (F) pedicels, (G) pollinaria (ventral side), (H) pollinaria (dorsal side)

Photographs: (A)-(E) and (G) by Jing-Feng Zhang; (F) and (H) by Yan-Feng Kuang, based on the type collection before pressing.

Hoya tengchongensis J.F.Zhang, N.H.Xia & Y.F.Kuang

Jing‐Feng Zhang, Nian‐He Xia and Yan‐Feng Kuang. 2019. Hoya tengchongensis sp. nov. (Apocynaceae, Asclepiadoideae) from Yunnan, China. Nordic Journal of Botany.  37(5); DOI:  10.1111/njb.02282

  Researchgate.net/publication/332327324_Hoya_tengchongensis_a_new_species_from_Yunnan_China

[Botany • 2022] Marsdenia burmanica (Apocynaceae: Asclepiodoideae) • A New Species from Kachin, Myanmar

  Marsdenia burmanica Wen B.Xu & J.Y.Shen, 

in Xu, Liu, Yan & Shen, 2022. 

 緬甸牛奶菜 || taiwania.ntu.edu.tw

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Abstract

Marsdenia burmanica Wen B.Xu & J.Y.Shen (Apocynaceae), a new species from Hongga Mountain, Putao County, Kachin State, Myanmar, is described and illustrated. It is similar to M. hainanensis, M. sinensis, and M. tenii, but differs from them by campanulate flowers, fusiform gynostegium exserted from the corolla tube, 2-cleft stigma head, purple corolla and a corona of 2 oval protrusions at the base of the corona. Photographs, line drawing, distribution, comparison with related species, and a conservation assessment are provided for this rarely observed species.

Keyword: Apocynaceae, Kachin, Marsdenia hainanensis, M. sinensis, M. tenia, Myanmar

   Marsdenia burmanica Wen B.Xu & J.Y.Shen. 
 A. Section of trailing plant in habit. B. Flower in lateral view. C. Dissected and spread open corolla showing inner side. D. Anther in ventral view. E. Anther and corona in side view. F. Flowers with corolla removed (lateral view). G. Gynostegium in lateral view. H. Pollinia.

 Drawn by Jing-Jing Yan.

  Marsdenia burmanica Wen B.Xu & J.Y.Shen.
A. Twig showing leaf orientation and position of inflorescences. B. Inflorescence in lateral view. C. Flower in ventral view. D. Inflorescence in ventral view. E. Leaves showing abaxial (right) and adaxial (left) surface. F. Leaves adaxial (above) and abaxial (below) surface indumentum. G. Gynostegium in ventral view, showing 2-cleft stigma head. H. Corona lobes, showing 2 oval protrusions in lateral view at base of gynostegium. I. Gynostegium in lateral view; showing oval-conical form. J. Pollinarium.

Photos by Jian-Yong Shen.

    

Marsdenia burmanica Wen B.Xu & J.Y.Shen, sp. nov.

   Diagnosis: Marsdenia burmanica is morphologically similar to M. hainanensis, M. sinensis, and M. tenii (Table 1), but differs from M. hainanensis in the fusiform gynostegium, 2-cleft stigma head, purple corolla and 2 oval protrusions; and differs from M. sinensis in the fusiform stigma head, purple corolla and 2 oval protrusions at the corona base; and also differs from M. tenii in dichasial cyme, fusiform gynostegium, purple corolla and 2 oval protrusions.

Distribution & habitat: At present, M. burmanica has only been found in the type locality. It grows in the sunny part of hillsides, at an elevation of ca. 900 m. 

Etymology: The new species found in northern Myanmar, thus the specific epithet “burmanica” was chosen. The Chinese name is “緬甸牛奶菜”.

Wen-Bin Xu, Yan-Ling Liu, Jing-Jing Yan and Jian-Yong Shen. 2022. Marsdenia burmanica (Apocynaceae, Asclepiadoideae), A New Species from Kachin, Myanmar. Taiwania. 67(3); 450-454. DOI: 10.6165/tai.2022.67.450

 taiwania.ntu.edu.tw/abstract.php?type=abstract&id=1861

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[Botany • 2020] Hoya lamthanhiae (Apocynaceae: Asclepiadoideaea) • A New Species from southern Vietnam

Hoya lamthanhiae V.T. Pham & Kloppenb.,

in Pham,  Kloppenburg, Averyanov, et al. 2020. 

 Researchgate.net/publication/336659016 

Hoya lamthanhiae V.T. Pham & Kloppenb. is described and illustrated. The molecular data is provided; this species was found in Dak Lak province, southern Vietnam. Diagnostic features of the new species are a milky latex lithophytic vine and pure white with red-purple centre flowers. The described species clearly differs from closely related H. hainanensis in number of characters: a leaf blade shortly attenuated and wavy margins at the base, a hairy abaxial leaf surface, a bigger calyx with few sparse hairs or glabrous, a bigger corolla with acute lobe, shorter pollinia, as well as molecular characters. 

Key words: Asclepiadoideae, Hoya, New species, Plant diversity, Vietnam.  

 

Hoya lamthanhiae V.T. Pham & Kloppenb.
A. Habit. B. Inflorescence with leaf (preserved in ethanol). C, D. Inflorescence. E. Leave (above: adaxial view; dorsal: abaxial view). F. Petioles. G. Leaf bases. H. A part of peduncle and pedicels. I. Flowers (left: frontal view; right: dorsal view). J. Corolla and corona (side view). K. Calyx and petal (view from behind). L. Corolla (frontal view and dorsal view). M. Corona (haft-side view). N. Corona lobe (left: half-side view; right: dorsal view). O. Ovary. P. Pollinaria. Q. Pollinia. R. Retinaculum.

 All illustrations were made from the type specimens.

Hoya lamthanhiae V.T. Pham & Kloppenb., sp. nov.

Diagnostic morphology characters: Described species is most closely related to Hoya hainanensis Merr. (1923: 263) from Hainan, sometimes regarded as a synonym of H. ovalifolia Wight & Arn. (Li et al., 1995). However, type specimens of H. ovalifolia accessed from E and NY virtual herbariums and a description from Wight (1834: 37) are apparently quite different. In contrast, leaf form and habit of H. hainanensis is similar to the new species. The examination by the second author of type specimens of H. hainanensis deposited at UC and observations of other types at A, MO and US virtual herbariums, reveal the following differences from our new species; leaf blade shortly attenuate and wavy margins at base, hairy abaxial leaf surface, bigger calyx with few sparse hairs or glabrous, bigger corolla with acute lobe, as well as shorter pollinia as it is presented in Table 3.

Distribution: The species is currently known only from the lone type locality in Dak Lak province, southern Vietnam. 

Habitat and ecology: Hoya lamthanhiae occurs in primarily evergreen broad-leaved forests, often on granite outcrops along streams at an elevation of approximately 800 m a.s.l. 

Etymology: Species is named after its discoverer - Mrs. Lam Thi Ngoc Thanh. 

Vernacular name: Vietnamese: Cẩm cù lâm thành.

The Van Pham, Robert D. Kloppenburg, L.V. Averyanov, et al. 2020. Hoya lamthanhiae (Asclepidoideae, Apocynaceae), A New Species from southern Vietnam. Pakistan Journal of Botany. 52(1); DOI: doi.org/10.30848/PJB2020-1(32) 

Researchgate.net/publication/336659016_Hoya_lamthanhiae_a_new_species_from_southern_Vietnam

[Botany • 2015] Hoya hanhiae (Apocynaceae: Asclepiadoideaea) • A New Species from central Vietnam

 Hoya hanhiae V. T. Pham et Aver., 

 

in Pham, Le et Averyanov. 

  DOI: 10.1111/njb.00541 

 Researchgate.net/publication/273960722 

A new species, Hoya hanhiae V. T. Pham et Aver. discovered in central Vietnam is described, illustrated and compared with the related species H. macrophylla Bl. and H. verticillata (Vahl) G. Don.

 Hoya hanhiae sp. nov.
(a) flowering plant, (b) leaf, (c) flower, view from above, (d) flower, view from below, (e) flower, view from side, (f) corona, views from above, (g) corona, views from below, (h) ovaries, (i) pollinarium, (j) follicles, (k) seed.

Drawn from T. A. Le PVT 588 and T. H. Nguyen PVT 589 

by T. H. Nguyen and V. T. Pham.

 Hoya hanhiae sp. nov.
 (a) flowering plant in natural habitat, (b) leaves, (c) inflorecscences with flowers of various coloration, (d) inflorescence, view from below, (e) flowers, frontal and half-side views, (f) flowers and their parts, (g) fruits, (h) seeds.

Photographs by T. A. Le and T. H. Nguyen. 

Design and image correction by L. Averyanov.

Hoya hanhiae V. T. Pham et Aver. sp. nov. 

Etymology: The species is named after the plant discoverer Mrs Nguyen Thuy Hanh.

Distribution: Lowland coastal areas of Quang Tri (Hai Lang distr.) and Khanh Hoa (vicinities of Nha Trang city) provinces in central Vietnam.

Ecology and phenology: Hoya hanhiae was observed as an epiphytic creeping vine on large old trees in secondary tropical evergreen seasonal broad-leaved lowland swamp forest on sandy soil at elevation 10–50 m a.s.l., near sea shore. The dominating trees and shrubs in habitats of H. hanhiae were Uvaria cordata, Cereus repandus, Tetracera sarmentosa, Barringtonia acutangula, Sterculia lanceolata, Salacia wrightii, Syzygium bullockii, Memecylon umbellatum, Carallia brachiata, Gluta wrayi, Acronychia pedunculata, Fagraea fragrans, Garcinia sp. and Lithocarpus sp. Flowering was sporadically observed from June to August. Flowers open late afternoon and close in the morning the following day, caducous in 3–4 days. Fruits were seen in August.

Van The Pham, Tuan Anh Le and Leonid V. Averyanov. 2015. Hoya hanhiae sp. nov. (Apocynaceae, Asclepiadoideae) from central Vietnam. Nordic Journal of Botany. 33(1); 64-67.  DOI: 10.1111/njb.00541

  Researchgate.net/publication/273960722_Hoya_hanhiae_sp_nov_from_central_Vietnam

[Botany • 2021] Hoya batutikarensis • One New Species and A New Record of Hoya (Apocynaceae, Asclepiadoideae) from Sulawesi, Indonesia

Hoya batutikarensis   

in Ahmad, Zulfadli, Rahayu & Rodda, 2021. 

 DOI: 10.11646/phytotaxa.502.1.5

Abstract

One new species of Hoya from Indonesia, Hoya batutikarensis, is described and illustrated. It is similar to H. camphorifolia but it has unusual corona lobes, each lobe has a spreading process at base and an apical triangular process, while the corona of H. camphorifolia has simple navicular lobes. Hoya ischnopus, a species so far only known to occur in New Guinea, is newly recorded in Sulawesi, considerably extending its distribution area.

Keywords: Eudicots, Marsdenieae, Malesia, Sulawesi Tengah, taxonomy

Hoya batutikarensis

Roland Putra Pribadi Ahmad, Zulfadli Zulfadli, Sri Rahayu and Michele Rodda. 2021. One New Species and A New Record of Hoya (Apocynaceae, Asclepiadoideae) from Sulawesi, Indonesia. Phytotaxa. 502(1); 79–85. DOI: 10.11646/phytotaxa.502.1.5

[Botany • 2021] Hoya pyrifolia (Apocynaceae: Asclepiadoideae) • A New Species from south-western Yunnan, China

Hoya pyrifolia  E.F. Huang

in Huang, Yao, Jiang, ... et Zhang, 2021.

DOI: 10.3897/phytokeys.174.60137 

Abstract

Hoya pyrifolia, a new species of Apocynaceae from Yunnan Province, China, is described and illustrated. Results from phylogenetic analyses, based on combined DNA fragments of the nuclear ribosomal external transcribed spacer (ETS), intergeneric transcribed spacer (ITS) and three plastid DNA fragments (matK, psbA-trnH and trnT-trnL), showed that the new species was nested within a clade, including Hoya species distributed in the subtropical foothills of the Himalayas and the Tibet-Sichuan Plateau. Morphologically, the new species can be distinguished from its close relatives by its pyriform and slightly pubescent leaves, as well as the 4-flowered inflorescences.

Keywords: Apocynaceae, Asclepiodoideae, China, Hoya, taxonomy

Figure 3. Hoya pyrifolia  E.F. Huang
A habit B leaf C inflorescence D bracteole E calyx lobes F corolla, adaxial side G corolla, abaxial side H corona I corona lobe J pollinarium K fruit L seed. Drawn by Y.J. Chen. 

Figure 4. Hoya pyrifolia E.F. Huang
 A habit showing inflorescences and mature follicles B branch and inflorescence C corona lobes D corona top view E flower F bracteoles G pollinarium H pedicel and calyx lobes I part of Pedicel J corona side view K leaves L seed.

Inflorescences of Hoya species
G H. chinghungensis (Y. Tsiang & P.T. Li) M.G. Gilbert, P.T. Li & W.D. Stevens;
I H. kingdonwardii P.T. Li;  J H. engleriana Hosseus;
K H. lanceolata Wall. ex D. Don; L–N H. longicalyx W. Hui & E.F. Huang 

Hoya pyrifolia E.F. Huang, sp. nov.

 

Diagnosis: The species is morphologically most similar to H. engleriana, but differs by its leaves which are pyriform and 10–14 mm long (vs. narrowly oblong and 20–25 mm long), its 4-flowered inflorescences (vs. 5–7-flowered), its calyx lobes ca. 4 mm long (vs. 1.5–2 mm long) and the triangular corolla (vs. narrowly oblong to oblong-triangular).

Etymology: Hoya pyrifolia is named for its pyriform leaf, which is a significant feature that can be used to distinguish the species from its close relatives.

Distribution and habitat: The species is endemic to Gaoligong Mountain, distributed in Longling and Yingjiang Counties in Yunnan Province. It is an epiphyte on tree trunks in the mid-montane evergreen forests at an elevation from 1850 m to 2150 m.

 Er-Feng Huang, Gang Yao, Ri-Hong Jiang, Lei-Lei Yang, Wang Xi, Zhong-Shuai Zhang and Xian-Chun Zhang. 2021. Hoya pyrifolia (Apocynaceae), A New Species from south-western Yunnan, China. PhytoKeys. 174: 95-106. DOI: 10.3897/phytokeys.174.60137