[Botany • 2026] Gaultheria watsonii (Ericaceae) • A New Species from Sikim Himalaya

 

Gaultheria watsonii D.Maity, A.K.Halder and S.Saha,

in Maity, Halder, Saha, Panda, Jha et Pradhan, 2026.

 DOI: doi.org/10.24823/ejb.2026.3606

Abstract

A new species of Gaultheria L. (Ericaceae) from the Sikkim Himalaya, Gaultheria watsonii, is described and illustrated. This species is  morphologically most similar to Gaultheria heteromera in terms of habit, especially in its procumbent branchlets and tetramerous flowers. However, it can be readily distinguished from all other known species of the genus, including Gaultheria heteromera, by its unique combination of morphological characters, namely prostrate habit with procumbent branchlets, adaxially smooth and smaller leaf blades with strongly acute and mucronulate apices, pseudoterminal 2- to 4-flowered racemes, longer rachis, shorter pedicel, 4-merous flowers, and ovary sparsely white hispidulous with conspicuously 8- to 10-lobed discs. Based on its limited geographical distribution and the continuing decline in habitat quality, the conservation status of the new species is provisionally assessed as Critically Endangered [CR B2ab(iii)] according to the IUCN Red List criteria.

Keywords: Critically Endangered (CR), Gaultheria series Leucothoides (Airy Shaw) D. J. Middleton, Himalaya, IUCN

Gaultheria watsonii D.Maity, A.K.Halder and S.Saha, sp. nov.
 A, Habit and habitat; B, inflorescence; C, flower.

Photographs: A. K. Halder.

Gaultheria watsonii D.Maity, A.K.Halder and S.Saha, sp. nov.

The new species is most similar to Gaultheria heteromera, from which it differs by having smaller leaf blades (4–10 × 3–5 mm vs 8–25(–30) × 5–14 mm), strongly acute leaf apex (vs obtuse), smaller petioles (0.5–0.75 mm vs 1–3 mm), pseudoterminal racemes (vs pseudoterminal and axillary), longer rachis (5–15 mm vs 3–6(–10) mm), shorter pedicel (1–1.75 mm vs 3–6 mm), bract and bracteoles with margins densely ciliolate (vs eciliolate), 8 stamens (vs 8 or 9), and ovary with conspicuous shallowly lobed disc (vs disc absent). In Gaultheria heteromera the veins on the adaxial surface of leaves are distinctly impressed, forming prominent reticulations, whereas in the new species although sometimes the midvein is slightly depressed adaxially, the secondary and tertiary veins are not impressed and thus the upper surface appears smooth. Moreover, in Gaultheria watsonii the ovary is sparsely white-hispidulous, whereas in G. heteromera the ovary is densely hispidulous.

D. Maity, A. K. Halder, S. Saha, S. Panda, B. K. Jha and D. K. Pradhan. 2026. GAULTHERIA WATSONII (ERICACEAE): A New Species from Sikim HIMALAYA. EDINBURGH JOURNAL OF BOTANY. 83, 3606. DOI: doi.org/10.24823/ejb.2026.3606 [2026-08-24]

[Botany • 2026] Rhododendron trichopetalum & R. yalaense (Ericaceae) • Two New Species, Three New Records and Taxonomic Notes of Rhododendron in Thailand

Rhododendron yalaense Tubtamat, Watthana & Suwanph.
 

 in Tubtamat, Watthana, Hodkinson et Suwanphakdee, 2026. 

DOI: doi.org/10.20531/tfb.2026.54.2.10

Photographed by M. Tubtamat and C. Suwanphakdee.

Abstract

Two new species, Rhododendron trichopetalum and R. yalaense, from Peninsular Thailand, are described and illustrated. Three new records of R. jasminiflorum, R. klossii and R. robinsonii are newly reported for Thailand, and R. klossii is herein reinstated. Lectotypifications were designated where required and an updated key to species, modified from the Flora of Thailand, is provided.

Keywords: anatomical features, Ericaceae, plant taxonomy, pollen morphology, Flora of Thailand

Rhododendron trichopetalum Tubtamat & Suwanph.
A. flowering branch; B. flowers; C. hairs on corolla tube; D. basal filament with hairs; E. anther; F. ovary; G. stigma; H. capsule.

Photographed by C. Suwanphakdee and M. Tubtamat.

Rhododendron trichopetalum Tubtamat & Suwanph., sp. nov.

This species is similar to Rhododendron javanicum subsp. teysmannii (Miq.) Argent, however, R. trichopetalum lacks hairs on lower leaf surfaces (vs sparsely hairy or glandular-verruculose in R. javanicum subsp. teysmannii), with the corolla tube being sparsely hairy outside (vs glabrous), and the larger capsule 2.3–2.5 cm long (vs 3.7–8 cm long).

Rhododendron yalaense Tubtamat, Watthana & Suwanph.
A. habit; B. scales on lower leaf surface; C. inflorescence; D. ovary; E. stigma; F. capsule.

Photographed by M. Tubtamat and C. Suwanphakdee.

Rhododendron yalaense Tubtamat, Watthana & Suwanph., sp. nov.

This new species is similar to Rhododendron rarilepidotum J.J.Sm., endemic to Indonesia, but differs by having petioles without grooves (vs with grooves in R. rarilepidotum), corolla 3.1–3.6 cm long (vs 2–2.5 cm long), pale orange with 2.1–3.0 cm long filaments (vs purplish, dark red or white, 0.9–1.0 cm long), yellow anthers (vs purplish) and cylindrical capsule (vs fusiform capsule).

Maneenuch Tubtamat, Santi Watthana, Trevor R. Hodkinson and Chalermpol Suwanphakdee. 2026. Two New Species, Three New Records and Taxonomic Notes of Rhododendron (Ericaceae) in Thailand. Thai Forest Bulletin (Botany). 54(2); 92–116. DOI: doi.org/10.20531/tfb.2026.54.2.10 [2026-08-10] 

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กุหลาบฮาลา และ กุหลาบเพลิงภักดิ์: กุหลาบพันปีชนิดใหม่ของโลก

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1. Rhododendron trichopetalum Tubtamat & Suwanph. ชื่อไทย กุหลาบฮาลา พบที่จังหวัดนราธิวาส  ดอกมีสีเหลืองเข้ม กลีบดอกเป็นเอกลักษณ์ และเจริญเติบโตแบบพืชอิงอาศัยในป่าดิบชื้น ความโดดเด่นของลักษณะดอกและการปรับตัวต่อสภาพแวดล้อม ทำให้มีศักยภาพในการใช้เป็นแหล่งพันธุกรรมสำหรับการปรับปรุงพันธุ์ไม้ดอกประดับในอนาคต

2. Rhododendron yalaense Tubtamat, Watthana & Suwanph. ชื่อไทย กุหลาบเพลิงภักดิ์ พบที่จังหวัดยะลา ดอกมีสีส้มเข้ม ออกเป็นช่อค่อนข้างแน่น และเจริญเติบโตแบบพืชอิงอาศัย ด้วยลักษณะดอกที่โดดเด่นและสีสันสวยงาม จึงมีศักยภาพในการพัฒนาเป็นไม้ดอกประดับในอนาคต ควบคู่กับการอนุรักษ์ทรัพยากรพันธุกรรมของพืชพื้นถิ่นไทย

[Botany • 2026] Rhododendron jiucaipingensis (Ericaceae, subgen. Hymenanthes) • A New Species from Guizhou, China

Rhododendron jiucaipingensis Jian Xu & M. T. An, 

in Hu, Xu, An, Yu et Lu, 2026. 

韭菜坪杜鹃  ||  DOI: doi.org/10.3897/phytokeys.275.183519

Abstract

Rhododendron jiucaipingensis Jian Xu & M. T. An, sp. nov. (Ericaceae), a new species of R. subgen. Hymenanthes, subsect. Argyrophylla, from northwestern Guizhou, China, is described and illustrated. It is an evergreen shrub 1.5–3.0 m tall, characterized by green, densely white-tomentose current-year branchlets, leaves crowded at branch apices (5.5–9.5 × 2.5–4.0 cm) with 8–11 pairs of lateral veins, 10 stamens, and cylindric capsules 1.2–2.0 cm long. The new species is morphologically most similar to R. hypoglaucum and R. argyrophyllum, but it is readily distinguished by having densely white-tomentose current-year branchlets, fewer lateral veins (8–11 pairs), a double-layered white indumentum on the abaxial surfaces of young leaves, and 10 stamens. Phylogenetic analysis based on a whole-genome SNP dataset robustly resolves R. jiucaipingensis as a distinct lineage within subsect. Argyrophylla, positioned as sister to the monophyletic clade of five congeneric species with high support (SH-aLRT = 100%, UFBoot = 100%). This molecular evidence, congruent with diagnostic morphological characters, supports the recognition of R. jiucaipingensis as a species new to science.

Key words: Ericaceae, Flora of China, morphology, phylogeny, taxonomy

Rhododendron jiucaipingensis Jian Xu & M. T. An, sp. nov.
 A. Cliff habitat; B. Older branches; C. Current-year branchlet and its dense white tomentum (inset); D. Mature leaf and its short, brown tomentum on the abaxial surface (inset); E. Adaxial surface of young leaf; F. Abaxial surface of young leaf and long white glandular hairs of it (inset); G. Flowering plant; H. Anatomical diagram of the flower and leaf; I. Stamens and their white stiff hairs at the filament base (inset); J. Calyx; K. Ovary; L. Capsule and its colorless stellate hairs (inset); M. Capsule in longitudinal section (Photographs by Jian Xu)

Diagnosis. Rhododendron jiucaipingensis belongs to subgen. Hymenanthes and is similar in morphology to R. hypoglaucum and R. argyrophyllum, but can be distinguished from R. hypoglaucum by its current-year branchlets and young petioles being densely covered with indumentum (vs. glabrous), and its pedicels being densely white-villous (vs. glabrous). It further differs from R. hypoglaucum in having fewer lateral veins (8–11 pairs vs. 10–14 pairs), an ovary sparsely covered with colorless stellate hairs (vs. glabrous), and typically 7-loculed capsules (vs. 6-loculed). Compared to R. argyrophyllum, the new species is distinguished by its acuminate leaf apex (vs. obtuse), fewer stamens (10 vs. 12–15), and the presence of colorless stellate hairs on the ovary (vs. white short tomentum). Additionally, R. jiucaipingensis is characterized by its restricted cliff habitat at higher elevations (2,400–2,700 m).

Etymology. The specific epithet jiucaipingensis refers to the type locality, Xingfa Township (Jiucaiping), Hezhang County, Bijie City, Guizhou, China.

Vernacular name. The Chinese name is jiǔ cài píng dù juān (韭菜坪杜鹃).

Hong-Fen Hu, Jian Xu, Ming-Tai An, Jiang-Hong Yu, Xing Lu. 2026. Rhododendron jiucaipingensis (Ericaceae), A New Species from Guizhou, China. PhytoKeys 275: 15-26. DOI: doi.org/10.3897/phytokeys.275.183519 [19 May 2026]

[Botany • 2026] Gaultheria rostrata (Ericaceae) • A New Species endemic to Mindanao Island, Philippines

 

Gaultheria rostrata M.N.Tamayo, P.W.Fritsch & Medecilo,  

in Tamayo, Lagunday, Amoroso, Tandang, Fritsch et Medecilo-Guiang, 2026. 

DOI: doi.org/10.24823/ejb.2026.2104 

Abstract

Gaultheria rostrata, a new species of wintergreen endemic to Mindanao Island, Philippines, is here described and illustrated. It resembles Gaultheria bartolomei, endemic to Luzon Island, but differs by having a terrestrial habit, shorter petioles, longer pedicels, white or pale-pink corollas, coiled corolla lobes, longer anther tubules, and a longer style. The flowers of Gaultheria rostrata are unique among Asian species of Gaultheria on account of their coiled corolla lobes exposing the anthers and style at anthesis. This discovery raises the number of Gaultheria species in the Philippines to 16.

Keywords: Biodiversity, endemic, Gaultheria sect. Diplycosia, Southern Philippines, Taxonomy

Gaultheria rostrata M.N.Tamayo, P.W.Fritsch & Medecilo, sp. nov.
A, Habit in situ; B, leafy branchlets; C, leaf, abaxial surface; D, leaf, adaxial surface; E and F, flowering branchlets; G, flower bud; H, I and J, upper pedicel, bracteoles and flower; K, stamens, ventral view.

Photographs: A–E and H, M. M. Medecilo-Guiang from M.M.M.-G. 1030; F, G, I and J, D.N. Tandang; K, M. N. Tamayo from M.M.M.-G. 1030.

Gaultheria rostrata M.N.Tamayo, P.W.Fritsch & Medecilo, sp. nov.

This species resembles the Philippine endemic Gaultheria bartolomei (Ferreras & Argent) Kron & P.W.Fritsch but differs by having a terrestrial habit (vs epiphytic), shorter petioles (4–4.5 mm vs 5–7 mm), longer pedicels (20–35 mm vs 20–25 mm), white or pale-pink corollas (vs deep pink), corolla lobes coiled (vs reflexed), longer anther tubules (4–4.5 mm vs c.1 mm), and a longer style (10–11 mm vs c.8 mm).

Etymology. The specific epithet rostrata alludes to the morphological resemblance of the flowers of the new species to avian beaks or proboscides.

M. N. Tamayo, N. E. Lagunday, V. B. Amoroso, D. N. Tandang, P. W. Fritsch and M. M. Medecilo-Guiang. 2026. GAULTHERIA ROSTRATA (sect. Diplycosia, ERICACEAE), A New Wintergreen Species endemic to Mindanao Island, Philippines. Edinburgh Journal of Botany. 83; DOI: doi.org/10.24823/ejb.2026.2104 [2026-05-05]

[Botany • 2022] Vaccinium sulawesiense (Ericaceae: Vaccinieae) • Vaccinium in Sulawesi: A New Species and A List of known Taxa

 

Vaccinium sulawesiense Mustaqim & P.W.Fritsch, 

in Mustaqim, Fritsch, Ahmad, Lakiu, Pitopang et Ardi, 2022.

DOI: 10.7751/telopea15774 

Researchgate.net/publication/363672464

Abstract

Vaccinium sulawesiense Mustaqim & P.W.Fritsch, a newly discovered endemic to Sulawesi, Indonesia, is described. This species is similar to V. simulans Sleumer but differs in having an acuminate leaf apex, larger floral organs, and an absence of trichomes in the upper half of the inner surface of corolla and disk. This species is known from the two specimens, one from a mid-montane rain forest in Mamasa Regency, Sulawesi Barat Province and the another from Poso Regency, Sulawesi Tengah Province. An updated list of the 17 known Vaccinium species in Sulawesi is also provided.

Keywords: endemic, Ericales, shrub, Sulawesi, taxonomy

Morphology of Vaccinium sulawesiense Mustaqim & P.W.Fritsch:
A. Living plant. B. Branchlets with leaves and inflorescences. C. Inflorescence. D. Flowers.

 Scale bar: B–D = 10 mm. 

Photographs: A–C by Wendy A. Mustaqim, All images from W.H. Ardi et al. 583.

  

Wendy A. Mustaqim, Peter W Fritsch, Roland P.P. Ahmad, Fedrik S. Lakiu, Ramadanil Pitopang and Wisnu H. Ardi. 2022. Vaccinium (Ericaceae) in Sulawesi: A New Species and A List of known Taxa. Telopea. 25; 301–307. DOI: 10.7751/telopea15774 

Researchgate.net/publication/363672464_Vaccinium_Ericaceae_in_Sulawesi

[Botany • 2026] Rhododendron luohanbaense (Ericaceae, subgen. Hymenanthes) • A New Species from northeast Yunnan, China

 

Rhododendron luohanbaense Y.L.Zhao & D.T.Liu, 

 in Zhao, Gu, Liao, Zhang, Li, Xie, Wang, Ma, Mao et Liu, 2026. 

罗汉坝杜鹃  ||  DOI: doi.org/10.3897/phytokeys.273.182747

Abstract

Rhododendron luohanbaense, a new species of Ericaceae, is described from Zhaotong City in northeastern Yunnan Province, China. Morphologically, it is most similar to both R. pachytrichum and R. maculiferum and can be classified into the subgen. Hymenanthes sect. Pontica subsect. Maculifera. However, it can be easily distinguished by markedly smaller and narrower leaves with acuminate apex, abaxial midribs densely covered with woolly indumentum, yellowish-green corollas speckled with green or purple dots, inflorescences bearing up to 7 flowers, flowers with ovary densely pilose, capsule densely brown setose. Phylogenomic evidence, based on a coalescent-based species tree reconstructed from 5358 single-copy nuclear orthologous genes, also supports recognition of the new taxon.

Key words: Ericaceae, new taxon, nuclear orthologous genes, phylogeny

Rhododendron luohanbaense Y.L.Zhao & D.T.Liu, sp. nov.
 A. Leaf; B. Leaf, abaxial midrib; C. Flowering branch; D. Dissection of flower; E. Ovary; F. Opened capsule; G. Habitat; H. Stem.

Rhododendron luohanbaense (A, D, G, J), R. pachytrichum (B, E, H, K) and R. maculiferum (C, F, I, L).
A–C. Leafy branches; D–F. Abaxial midrib of leaves; G–I. Flowering branch; J–L. Capsule.

Rhododendron luohanbaense Y.L.Zhao & D.T.Liu, sp. nov.

Etymology. The specific epithet derives from the Luohanba, the subzone of the Yunnan Wumengshan National Nature Reserve where the holotype was collected; Chinese mandarin: luó hàn bà dù juān (罗汉坝杜鹃).

 Yong-Li Zhao, Chao-Shan Gu, Zheng-Hang Liao, Jing-Li Zhang, Wei Li, Zhu-Fang Xie, Fei Wang, Yong-Peng Ma, Xing-Xing Mao and De-Tuan Liu. 2026. Rhododendron luohanbaense (Ericaceae), A New Species from northeast Yunnan, China. PhytoKeys 273: 299-308. DOI: doi.org/10.3897/phytokeys.273.182747 [23 Apr 2026]

[Botany • 2026] Rhododendron yombuwurii (Ericaceae, subgen. Vireya) • A New orange-flowered Species from Central Sulawesi, Indonesia

  

Rhododendron yombuwurii Hutabarat, Bandjolu & Zulfadli,  

in Hutabarat, Zulfadli, Bandjolu, Basrul, Hariri, Senatama et Larekeng, 2026.

taiwania.ntu.edu.tw/abstract/2170  

Abstract

A new species of Rhododendron subgenus Vireya from Central Sulawesi, Rhododendron yombuwurii, is described. The species is known from material originating from the Tokorondo Range, northwest of Lake Poso, and is currently cultivated at a lower elevation near Saluopa Waterfall, where it grows epiphytically and produces small, bright orange flowers. We provide a detailed morphological description, comparative microscopic observations, notes on distribution, habitat and ecology, and a preliminary conservation assessment. Phylogenetic analyses based on the nuclear ribosomal ITS region support the placement of the species within subgenus Vireya and its distinction from morphologically similar taxa.

Keyword: Flora, Malesia, Mountain flora, Poso, Rhododendron celebicum, Schistanthe, Tokorondo, Wallacea

A. Rhododendron yombuwurii thriving and flowering as an epiphyte beneath the canopy of a small tree in Tentena, Central Sulawesi; B. The fresh material of the type specimen PWH1635; C. Flower bud of R. yombuwurii.

(Photographed by P.W.K. Hutabarat)

Morphology of Rhododendron yombuwurii Hutabarat, Bandjolu & Zulfadli, sp. nov.
 A. flowering stem; B. Semi–erect inflorescence; C. Flower bud; D. Glabrescent adaxial leaf; E. Scaly petiole; F. Scaly abaxial leaf; G. Scales on abaxial leaf; H. Narrow funnel–shaped corolla; I. Corolla lobes and stamen position; J. Corolla (inside); K. Androecium and gynoecium; L. Stamen; M. Gynoecium; N. Immature fruit; O. Laxly scaly ovary

 (Photographed by Zulfadli)

Rhododendron yombuwurii Hutabarat, Bandjolu & Zulfadli, sp. nov.

Diagnosis: Rhododendron yombuwurii is most closely allied to R. celebicum (Blume) DC. (de Candolle, 1839), and shows affinity to R. impressopunctatum J.J.Sm. (Smith, 1932), and R. vidalii subsp. brachystemon Argent (Argent, 2003). It differs from R. celebicum by its raised midrib and lateral veins (vs. slightly impressed), semi-erect to horizontal inflorescences (vs. pendulous), glabrous calyx externally (vs. densely scaly), and much smaller orange corolla, 17–22 × 12–16 mm (vs. 35–46 × 20–25 mm, pink to red). From R. impressopunctatum it differs in having smaller leaves, fewer-flowered inflorescences, smaller orange corollas, and filaments clustered at the corolla mouth rather than exserted. The species further differs from R. vidalii subsp. brachystemon by its scaly young twigs becoming glabrescent, longer leaves with raised veins, glabrous calyx externally, smaller orange corolla, and a sparsely scaly to nearly glabrescent ovary. Additional distinguishing characters are summarized in Table 1. ...

A. Type locality of Rhododendron yombuwurii in the Tokorondo Range, Poso Regency, Central Sulawesi. The red dot marks Saluopa Waterfall, where the type specimen was collected as a cultivated plant, while the yellow circle indicates Petirorano, the presumed original source of the species.
B. Saluopa Waterfall, a lower montane site at 560 m elevation, characterized by a cool and humid climate.

Prima Wahyu Kusuma Hutabarat, Zulfadli, Kurniawan Palindondaya Bandjolu, Basrul, Muhammad Rifqi Hariri, Andhika Senatama and Siti Halimah Larekeng. 2026. Rhododendron yombuwurii (Ericaceae), A New orange-flowered Species of subgenus Vireya from Central Sulawesi, Indonesia.  Taiwania. 71(2); 277-283 DOI: 10.6165/tai.2026.71.277 [2026 March 28] 

https://taiwania.ntu.edu.tw/abstract/2170  

[Botany • 2026] Monotropa callistoma (Ericaceae) • A New Species based on morphological and molecular evidence from Hunan, China

Monotropa callistoma  Ze Wei, Li J.Liu & Bing Liu,

in Wei, L.-J. Liu, Xuan, Mo, Yang, B. Liu, Li et Wang, 2026. 

美冠水晶兰  ||  DOI: doi.org/10.3897/phytokeys.271.177609

Abstract

The subfamily Monotropoideae (Ericaceae) comprises unique non-photosynthetic and mycoheterotrophic plants. Their extensive morphological reduction often poses significant challenges for species delimitation. In this study, we investigated an unknown Monotropa taxon collected from Hunan Province, China, through an integrative approach combining detailed morphological observation and phylogenetic analysis. We sequenced it, assembled the complete plastid genome and reconstructed phylogenetic trees using both chloroplast genomes and the nrITS region. Morphologically, this new entity is readily distinguished from its congener, Monotropa uniflora, by several key characteristics: 4–5 glabrous petals apically one-quarter orange and basally three-quarters white, 8–10 stamens with glabrous filaments, a nodding berry at maturity and a distinctly earlier flowering period (March–June vs. June–October). Phylogenetic reconstructions, based on both chloroplast genomes and nrITS data, consistently resolved this unknown taxon as a distinct lineage, clearly separating it from M. uniflora with strong support. Integrating evidence from morphology, phylogeny and phenology, we hereby describe it as a new species, Monotropa callistoma.

Key words: Ericaceae, Monotropa, morphology, new species, phylogeny, taxonomy

Morphology of Monotropa callistoma. A. Flower; B. Flowering plant showing scale-like leaves; C. Petals; D. Stamens; E. Transverse section of the ovary; F, G. Baccate fruit (berry) and its transverse section showing the parietal placentation; H. Mycorrhiza.

B–E. Photographed by Zi Wang and others photographed by Ze Wei.

Monotropa callistoma sp. nov.
A. Habitat and flowering plant; B. Flower, viewed from the top; C. Sepal; D. Petal; E. Stamen; F. Pistil; G. Berry; H. Transverse section of the berry fruit showing the parietal placentation; I. Mycorrhiza.

Drawn by Yi F. Li.

Monotropa callistoma Ze Wei, Li J.Liu & Bing Liu, sp. nov.

 

Diagnosis. Monotropa callistoma is characterised by its 4 or 5 glabrous petals (apically orange and basally white), 8–10 stamens with glabrous filaments, flowering period starting from March and nodding capsule at maturity. It is morphologically most similar to M. uniflora and Monotropastrum humile, but differs by the characters summarised in Table 2.

Etymology. The specific epithet callistoma is derived from the Greek calli- (beautiful) and -stoma (mouth), alluding to the aesthetically pleasing form and colouration of the corolla orifice.

Vernacular name. (Chinese name). 美冠水晶兰 (měi guān shuǐ jīng lán).

Habitat and flowering habit of Monotropa callistoma.

 Photographed by Ze Wei.

 Ze Wei, Li-Jia Liu, Jing Xuan, Zhi-Qiong Mo, Wen-Xiang Ou Yang, Bing Liu, Min Li and Qiang Wang. 2026. Monotropa callistoma (Ericaceae), A New Species based on morphological and molecular evidence from Hunan, China. PhytoKeys. 271: 145-160. DOI: doi.org/10.3897/phytokeys.271.177609 [27 Feb. 2026]

[Botany • 2026] Agapetes lichengii (Ericaceae) • A New Species from Xizang, China

Agapetes lichengii  Y.H.Tong & B.M.Wang, 

in Tong, Ye, Ni, Wang et Zheng. 2026. 

DOI: doi.org/10.3897/phytokeys.269.177341 

Abstract

A new species of Ericaceae, Agapetes lichengii, from Xizang Autonomous Region, China, is described and illustrated. The new species is morphologically most similar to A. pentastigma, but differs by having leaf blade with an obtuse or slightly auriculate leaf base, corolla with a constricted basal part and V-shaped stripes, spurless anthers and stigma without obvious gap between crenae. Detailed description, colour plates, and taxonomic notes on the new species are provided.

Key words: Agapetes, Mêdog, morphology, stigma ornamentation, taxonomy

Agapetes lichengii Y.H.Tong & B.M.Wang, 
A. Habit, the arrow shows a plant of this species epiphytic on a big tree trunk; B. Infructescence; C. Flowering branch and leaf branch; D. Leaves; E. Lateral view of flowers, showing the V-shaped transverse bands on corolla tube; F. Front view of flowers.

Photos (A, B) by Cheng Li, (C–F) by Y.H. Tong. 

(A. Unvouchered; B. based on J.B. Ni et al. TYH-2813; C–F. based on B.M. Wang s.n.).

Agapetes lichengii.
A. Inflorescence; B. Ovary, transection view; C. Bract and bracteoles; D. Calyx lobes, adaxial view; E. Pedicel; F. Corolla; G. Style and androecium; H. Style; I. Stamens, adaxial (left), lateral (middle) and abaxial (right) view; J. Lower part of stamens, showing pubescent filaments and echinate thecae, adaxial (left), lateral (middle) and abaxial (right) view; K. Front view of flower, showing the 5-crenated capitate stigma and corolla lobes; L. Front view of young fruits, showing the rounded ring of 10 distinct filament scars.

Scale bars: 3 cm (A, E, F, G, H, I); 5 mm (B, D, J, L); 2 mm (C); 1 cm (K).

 Agapetes lichengii Y.H.Tong & B.M.Wang, sp. nov.

 

Diagnosis. Agapetes lichengii is morphologically similar to A. pentastigma in having pseudo-whorled leaves, corymbose inflorescences, greenish yellow corolla with crimson transverse bands and capitate stigmas, but can be distinguished from it by the elliptic to oblanceolate (vs. oblong-lanceolate) leaf blades with an obtuse or slightly auriculate (vs. attenuate) base, corolla with a constricted(vs. not constricted) basal part, V-shaped (vs. ladder-like) stripes and triangular and spreading or slightly reflexed (vs. triangular-lanceolate and reflexed) lobes, anthers without dorsal spurs (vs. with two small dorsal spurs), stigma without gap between crenae (vs. with obvious gap between crenae), and filament scars forming a rounded ring (vs. a pentagonal ring) on fruit top (Fig. 3; Table 1).

Etymology. The species is named in honor of Mr. Li Cheng, who devoted lots of time and energy to the biodiversity conservation of Mêdog County, and is also one of the discoverers of this new species. The Chinese name is given as 李成树萝卜 (pinyin: lĬ chéng shù luó bo).

Yi-Hua Tong, Xue-He Ye, Jing-Bo Ni, Bing-Mou Wang and Xi-Rong Zheng. 2026. Agapetes lichengii (Ericaceae), A New Species from Xizang, China. PhytoKeys. 269: 183-191.  DOI: doi.org/10.3897/phytokeys.269.177341 

[Botany • 2026] Rhododendron mulunense (Ericaceae) • A New Species from the Karst Mountains of Guangxi and Guizhou Provinces, China

  

Rhododendron mulunense  Y.S.Huang & X.X.Mao,

in Hou, Huang, Luo, Chen et Mao, 2026.

木论杜鹃  ||  DOI: doi.org/10.3897/phytokeys.269.175011  

 

Abstract

Rhododendron mulunense, a new species of Rhododendron (Ericaceae) within subsect. Maddenia in sect. Rhododendron and endemic to karst areas of Guangxi and Guizhou Province, SW China, is described and illustrated. The new species most closely resembles R. wumingense, particularly in scale density on the abaxial leaf surface and in flower color and shape, but can be readily distinguished by its hairless shoots and leaves, larger tubular-funneled corolla, and longer and thinner white tube flushed with pink. According to the IUCN Red List Categories and Criteria, the threatened status of the new species is assessed as “Endangered, EN C2a(i), D.” We provide detailed documentation of its morphological characteristics, geographical distribution, digitized holotype voucher, and comparative photographs, along with a diagnostic table. An identification key is provided as a primary tool to enable taxonomic discrimination of this species from its congeners.

Key words: Conservation, morphology, Rhododendron mulunense, Rhododendron wumingense, taxonomy

Rhododendron mulunense.
 A. The habitat of this new species in type localities; B. Flowering plants; C. Leaves; D–F. Flowering branchlets, inflorescences, and flowers; G, H. Dissection of corolla; I. Flower buds; J. Stamens and style; K. Styles and ovaries; L. Dissection of ovary; M. Stigmas; N. Poorly developed stamens; O. Normal stamens; P, Q. Anther abaxial and adaxial surface; R. Tube base; S. Flower bud scales; T. Dehiscent capsule.

Photographs by Yu-Song Huang.

 Rhododendron mulunense Y.S.Huang & X.X.Mao, sp. nov.

Diagnosis. Resembles Rhododendron wumingense Fang but distinguishable by the absence of indumentum on young shoots, leaf margins, and petioles (vs. sparsely setose), longer and larger leaves (4.2–7.4 × 2.3–3.8 vs. 3.5–4.5 × 1.8–2.4 cm), relatively sparser scales on abaxial leaf surfaces (1–4 vs. 1–3 × their own diameter apart), corollas that are tubular funneled (vs. broadly funneled), longer and wider (5.9–7.5 × 4.7–7 vs. 3.1–4.5 × 3.3–4.9 cm) with slender tubes (2.9–3.9 × 0.5–1.2 vs. 1.9–2.5 × 1.7–2.4 cm), outer surface of corolla tubes white flushed with pink (vs. yellowish green) and pubescent but not scaly (vs. sparsely scaly and hairless) (Figs 1, 2, 4; Table 1).

Etymology. The specific epithet of this newly described species refers to its type localities at Guangxi Mulun National Nature Reserve, part of the South China Karst landscape registered in UNESCO’s World Heritage List.

Vernacular name. Simplified Chinese: 木论杜鹃; 

Chinese pinyin: mù lùn dù juān.

Ying Hou, Yu-Song Huang, Liu-Juan Luo, Zheng-Ren Chen, Xing-Xing Mao. 2026. Rhododendron mulunense (Ericaceae), A New Species from the Karst Mountains of Guangxi and Guizhou Provinces, China. PhytoKeys. 269: 99-112. DOI: doi.org/10.3897/phytokeys.269.175011  [08-01-2026]

[Botany • 2025] Vaccinium bidoupense (Ericaceae: Vaccinieae) • A New Species from Vietnam and Laos, with Notes on V. petelotii and V. pseudobullatum

Vaccinium bidoupense Smitinand ex Y.H.Tong, N.T.T.Huong & Tagane, 

in Nguyen, Tagane, Averyanov, Dang, Fritsch, Tong, Souladeth et Nuraliev, 2025.

DOI: doi.org/10.3897/phytokeys.266.168208 

Abstract

Vaccinium bidoupense, a new species of Ericaceae from the Central Highlands of Vietnam and their vicinity in Laos, is described and illustrated. The new species is morphologically similar to V. petelotii and V. pseudobullatum in its relatively large leaf blades and umbel-like inflorescence but differs in having the following combination of characters: pale red to salmon pink corollas, and longer pedicels, calyx lobes, corolla tubes and stamen filaments. The distinctness of V. bidoupense is further supported by its allopatric distribution relative to both V. petelotii and V. pseudobullatum. The range of morphological variation of V. petelotii and V. pseudobullatum is clarified, and their analytical photographic images are published for the first time. Additionally, the distinction between indeterminate and determinate racemes in Vaccinium is revisited, and the taxonomic history of Vaccinium sect. Calcicolus is summarized.

Key words: Central Highlands of Vietnam, Eastern Indochina, epiphytes, Tay Nguyen Plateau, Vaccinieae, Vaccinium sect. Calcicolus

 Vaccinium bidoupense Smitinand ex Y.H.Tong, N.T.T.Huong & Tagane, sp. nov.

 

Diagnosis. Vaccinium bidoupense is morphologically similar to V. petelotii and V. pseudobullatum in its relatively large leaf blades and umbel-like inflorescence with short rachis. It differs from V. petelotii in having longer calyx lobes (5–6 mm vs. 2.5–3 mm), pale red to salmon pink (vs. pale green) corolla, a longer corolla tube (11–13.5 mm vs. 3.5–4.5 mm), and longer stamens (14–16 mm vs. 5–6.5 mm). The new species differs from V. pseudobullatum in having leaf blades with somewhat less obvious tertiary veins, and longer pedicels (7–14 mm vs. 4–7 mm), corolla tube (11–13.5 mm vs. 8–9 mm) and stamen filaments (8–9 mm vs. 1–4 mm) (Table 1).

...

 Thi Thanh Huong Nguyen, Shuichiro Tagane, Leonid V. Averyanov, Van Son Dang, Peter W. Fritsch, Yi-Hua Tong, Phetlasy Souladeth and Maxim S. Nuraliev. 2025. Vaccinium bidoupense (Ericaceae), A New Species from Vietnam and Laos, with Notes on V. petelotii and V. pseudobullatum. PhytoKeys. 266: 75-96. DOI: doi.org/10.3897/phytokeys.266.168208 

[Botany • 2025] Rigiolepis bungeputih (Ericaceae: Vaccinieae) • A New Species from northern Gayo Plateau, Sumatra, Indonesia

Rigiolepis bungeputih Mustaqim & M.N.Tamayo, 

in Mustaqim, Tamayo, Arico et Fritsch, 2025.

  https://openjournals.library.sydney.edu.au/TEL 

 Researchgate.net/publication/391492519

Photos: Wendy A. Mustaqim.

Abstract

Rigiolepis bungeputih Mustaqim & M.N.Tamayo, a close relative of blueberries (Vaccinium L.) and endemic to the tropical evergreen mossy rainforest of northern Gayo Plateau, Sumatra, Indonesia, is here described. It closely resembles R. gayoensis Mustaqim, M.N.Tamayo & P.W.Fritsch, but differs by having a glabrous stem, larger leaves, glabrous pedicels, white corollas, and larger stamens. Photographs, an illustration, and a detailed morphological description are included. Rigiolepis bungeputih represents the second endemic Rigiolepis Hook.f. species known from the island of Sumatra. This discovery raises the number of Rigiolepis species found in this island to four. A discussion on the ovary character of Rigiolepis in view of ongoing molecular studies is presented.

Keywords: blueberry, Malesia, taxonomy, tropical rainforest, Rigiolepis, Vaccinium

Rigiolepis bungeputih.
A. Habitat and epiphytic habit (plant indicated by a blue arrow). B. Branchlet showing leaf adaxial surface. C, D. Branchlet showing leaf abaxial surface and inflorescence. E. Inflorescence, lateral view. F. Flower, anterior view. G. Immature infructescence. H. One mature (left) and two immature (right) fruits. I. Cross section of fruit showing a pseudo-10-locular ovary.

Photos: Wendy A. Mustaqim.

 Illustration of Rigiolepis bungeputih based on the type material (W.A. Mustaqim 2719).
A. Flowering branchlet. B. Leaf (adaxial view). C. Leaf (abaxial view). D. Lateral view of inflorescence. E. Flower (lateral view). F. Flower (anterior view). G. Stamen (ventral view). H. Stamen (dorsal view). I. Fruit cross section showing a pseudo-10-locular ovary.

Illustration by Maverick N. Tamayo.

Rigiolepis bungeputih Mustaqim & M.N.Tamayo, sp. nov.

Type: INDONESIA: Sumatra Island, Aceh Province, AcehTengah Regency, Jagong Jeget Subdistrict, ..., 2310 m elevation, 15 June 2023,W.A. Mustaqim 2719 (holotype: LGS; isotype: UIDEP).

Diagnosis: Rigiolepis bungeputih closely resembles R. gayoensis but differs by having a glabrous stem (vs pubescent),larger leaves (60–72 × 35–40 vs 46–55 × 22–25 mm), glabrouspedicels (vs pubescent on 1/2 to 3/5 of pedicel length), whitecorollas (vs red), and larger stamens (1.8–2.1 vs 1.5–1.7 mm) 

Etymology: The epithet “bungeputih” is derived from the Gayonese words “bunge” (flowers) and “putih” (white), in reference to the white corolla of the species.

Wendy A. Mustaqim, Maverick Narceda Tamayo, Zulfan C. Arico and Peter W. Fritsch. 2025. Rigiolepis bungeputih (Ericaceae: Vaccinieae), A New Species from northern Gayo Plateau, Sumatra, Indonesia.  Telopea. 29; 119–125. 
 https://openjournals.library.sydney.edu.au/TEL/article/view/20201

 facebook.com/61558740376893/posts/122182653074291345

 Researchgate.net/publication/391492519_Rigiolepis_bungeputih_a_new_species_from_northern_Gayo_Plateau_Sumatra_Indonesia

[Botany • 2025] Vaccinium kilangensis (Ericaceae) • A New species from the border of Ilocos Norte and Apayao Provinces, northern Philippines

 

Vaccinium kilangensis   

in Pelser, Cruz, Legaspi, Ibañez et Barcelona, 2025.

DOI: doi.org/10.11646/phytotaxa.721.1.4

 

Abstract

A new species of small-leaved Vaccinium is described from Kilang Pass in northern Luzon (Philippines), bringing the total number of Philippine Vaccinium species to 45. Vaccinium kilangensis differs from the other species in the genus in having elliptic (to narrowly obovate) leaves with an entire leaf margin and obtuse apex, one- to two-flowered inflorescences with persistent foliaceous bracts, broadly conical-urceolate corollas, and spurred anthers.

Ericales, Luzon, Malesia, Sect. Bracteata, Sect. Oarianthe, taxonomy, Eudicots

Pieter B. PELSER, Breiden Dela CRUZ, Ma. Susana V. LEGASPI, Jayson C. IBAÑEZ and Julie F. BARCELONA. 2025. Vaccinium kilangensis (Ericaceae), A New species from the border of Ilocos Norte and Apayao Provinces, northern Philippines.  Phytotaxa. 721(1); 75-80. DOI: doi.org/10.11646/phytotaxa.721.1.4 [2025-10-03]